-
Carrier 48AJ - page 1
Manufacturer reserves the right to disco ntinue, or change at any time, specifications or de signs without notice and without inc urring obligations. PC 111 Catalog No . 534-739 Printed in U .S.A. Fo rm 48A,E-1SI Pg 1 107 11-01 Replaces: 48E-6SI Book 1 Ta b 1 a Installation, Star t-Up and Ser v ice Instr uctions CONTENTS Page SAFETY CONSIDERA TIONS ...
-
Carrier 48AJ - page 2
2 RO OF CUR B — For vertical dischar ge units, assemble or in- stall accessory roof curb in accordance with instructions shipped with this accessory . See Fig. 1-4. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be installed to roof curb before unit is set in place. Curb should be level. This is necess ary t ...
-
Carrier 48AJ - page 3
3 Fig. 1 — Roof Curb — 48AJ,AK020-03 0 and 48EJ,EK024-034 Uni ts ...
-
Carrier 48AJ - page 4
4 Fig. 2 — Roof Curb — 48AJ,AK034-050 an d 48EJ,EK038-048 Unit s ...
-
Carrier 48AJ - page 5
5 Fig. 3 — Roof Curb — 48AJ,AK06 0 and 48EJ,EK054 -068 Units ...
-
Carrier 48AJ - page 6
6 Fig. 4 — Roof Curb Adapter — (48AJ,AK060 and 48EJ, EK054-068 Units on 48DD ,DF054-064 Retrofit, Part No. CRRCADPT005A00) NO TES: 1. Unless otherwise specified, all dimensions are to outside of par t. 2. Seal strip to be placed co vering ref erence holes. 3. Phantom lines represent seal strip. T otal length requi red is 75 linear ft. 4. If exi ...
-
Carrier 48AJ - page 7
7 Fig. 5 — Base Unit Dime nsions — 48AJ,AK020-030 NO TES: 1. Weights include econ omizer (standard). 2. Ce nter of Gravity . 3. Do not lo cate adjacent u nits with flue di scharge f acing economiz er inlet. Min Clearance s to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Overhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economiz er S ...
-
Carrier 48AJ - page 8
8 Fig. 6 — Base Unit Dime nsions — 48AJ,AK035-050 NO TES: 1. W eights include economiz er (standard) . 2. Center of Gra vity . 3. Do not locate adjacent units w ith flue discharge f acing econo mizer inlet. Min Clearanc es to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: N o Ove rhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economize r ...
-
Carrier 48AJ - page 9
9 Fig. 7 — Base Unit Di mensions — 48AJ,AK060 NO TES: 1. Weigh ts include economizer (standard ). 2. Center of Gra vity . 3. Do not locate adjacent units with flue dis- charge f acing economiz er inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Ov erhang. Condenser Coil: 4 ′ -0 ″ [1219] . Economizer Side ...
-
Carrier 48AJ - page 10
10 Fig. 8 — Base Unit Dimensi ons — 48AW,AY020- 030 NO TES: 1. W eights include economiz er (standard) . 2. Center of Gra vity . 3. Do not locate adjace nt units with flue discharge f acing economiz er inlet. Min Clearanc es to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: N o Ove rhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economize ...
-
Carrier 48AJ - page 11
11 Fig. 9 — Base Unit Dimensi ons — 48AW,AY035- 050 NO TES: 1. W eights include eco nomizer ( standard). 2. Center of Gra vity . 3. Do not loca te adjacent un its with flue discharge f acing ec onomizer i nlet. Min Clearanc es to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Overhan g. Condenser Coil: 4 ′ -0 ″ [1219]. Economiz ...
-
Carrier 48AJ - page 12
12 Fig. 10 — Base Unit Di mensions — 48W,AY060 NO TES: 1. Weig hts include economizer (sta ndard). 2. Center of Gr avity . 3. Do not locate adjacent units with flue dis- charge fa cing economiz er inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Overhan g. Condenser Coil: 4 ′ -0 ″ [1219]. Economizer Side ...
-
Carrier 48AJ - page 13
13 Fig. 11 — Base Unit Dimensions — 48EJ,E K024-034 NOTES: 1. W eights in clude econom izer (sta ndard). 2. Center of Gravity . 3. Do not lo cate adjacent units with flue dischar ge f acing econom izer inlet. Min Clearances t o be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Overha ng. Condenser Coil: 4 ′ -0 ″ [1219]. Economizer ...
-
Carrier 48AJ - page 14
14 Fig. 12 — Base Unit Dimensions — 48EJ,EK038 -048 NOTES: 1. W eights includ e economiz er (stand ard). 2. Center of Gra vity . 3. Do not locate ad jacent units with flue discharge faci ng economiz er inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: No Ov erhang. Condenser Coi l: 4 ′ -0 ″ [1219]. Economizer ...
-
Carrier 48AJ - page 15
15 Fig. 13 — Base Unit Dimensions — 48EJ,E K054-068 NO TES: 1. W eights incl ude economiz er (stand ard). 2. Ce nter of Gravity . 3. Do not locate adjacent units with flue di scharge f acing econ o- mizer inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: N o Ove rhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economi ...
-
Carrier 48AJ - page 16
16 Fig. 14 — Base Unit Dimensions — 48EW,EY02 4-034 NO TES: 1. W eights incl ude economiz er (stand ard). 2. Ce nter of Gravity . 3. Do not locate adjacent units with flue di scharge f acing econ o- mizer inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: N o Ove rhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economi ...
-
Carrier 48AJ - page 17
17 Fig. 15 — Base Unit Dimensions — 48EW,EY038-048 NOTES: 1. W eights include economizer (standard). 2. Center of Gra vity . 3. Do not locate adjacent u nits with flue d ischarge f acing eco no- mizer inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4 572]. T op of Units: No Overhang. Condenser Coil : 4 ′ -0 ″ [1219]. Economizer ...
-
Carrier 48AJ - page 18
18 Fig. 16 — Base Unit Dimensions — 48EW,EY05 4-068 NO TES: 1. W eights incl ude economiz er (stand ard). 2. Ce nter of Gravity . 3. Do not locate adjacen t units with flue discharge faci ng economiz er inlet. Min Clearances to be: Adjacent Units: 15 ′ -0 ″ [4572]. T op of Units: N o Ove rhang. Condenser Coil: 4 ′ -0 ″ [1219]. Economize ...
-
Carrier 48AJ - page 19
19 48AJ,AK,AW,AY UNITS Fig. 17 — Rigging Information UNIT CENTER OF GRA VITY PERCENT OF TO T A L WEIGHT A T EA CH CORNER (%) Inches Millimeters AB A B 1 2 3 4 48AJ,AKD020 72.4 42.2 1839 1072 21.0% 22.8% 29.2% 26.9% 48AJE020 73.3 42.7 1862 1085 21.6% 22.9% 28.6% 27.0% 48A W ,A YD020 72.4 42.2 1839 1072 21.0% 22.8 % 29.2% 26.9% 48A WE020 73.3 42.7 ...
-
Carrier 48AJ - page 20
20 48EJ,EK,EW,EY UNITS RIGGING WEIGHT S 48AJ,AK,A W ,A Y UNITS *Includes outdoor-air hoods, filt ers, largest a v ailable indoor-f an motor , modulating pow er e xhaust, and the largest av ailable v ariable frequency drive (VFD). NO TES: 1. Center of gravity . 2. On 020-050 includes 500 lbs and on 060 725 lbs for modulating power e xhaust. 3. On 02 ...
-
Carrier 48AJ - page 21
21 Table 1A — Physical Da ta — 48AJ,AK,AW,A Y Units LE GEND *Sizes 020-030: Circuit 1 uses the lower por tion of conde nser coil, Circuit 2 us es the upper portion. Sizes 035- 050: Circuit 1 uses the left co ndenser coil, Cir cuit 2 the right. All u nits hav e intertwined ev apor ator coils . †Rollout swit ch is manua l reset. NOTE: High heat ...
-
Carrier 48AJ - page 22
22 Table 1A — Physical Data — 48AJ,AK,AW,AY Units (cont) LEG END *Sizes 020-030: Circuit 1 uses the lower por tion of conde nser coil, Circuit 2 use s the upper portion. Sizes 035- 050: Circuit 1 uses the left co ndenser coil, Cir cuit 2 the right. All u nits hav e intertwined ev apor ator coils . †Rollout s wit ch is manua l reset. NOTE: Hig ...
-
Carrier 48AJ - page 23
23 Table 1B — Physical Data — 48EJ,EK,EW,EY Units *Sizes 024-034: Circui t 1 uses the lo wer p ortion of condenser coil, C ircuit 2 uses the upper portion. Sizes 038 -048: Circuit 1 uses the left co ndenser coil, C ircuit 2 the rig ht. All units h av e intertwined e vapor ator coils . †Motor and dri v e shown will deliver approximately 2.5 in ...
-
Carrier 48AJ - page 24
24 Table 1B — Physical Data — 48EJ,EK,EW,EY Uni ts (cont) *Sizes 024-034: Cir cuit 1 uses the lowe r portion of condenser coil, Circuit 2 uses the uppe r portion. Sizes 038 -048: Circuit 1 uses the left co ndenser coil, C ircuit 2 the rig ht. All units h av e intertwined e vapor ator coils . †Motor and dri v e shown will deliver approximately ...
-
Carrier 48AJ - page 25
25 Table 1B — Physical Data — 48EJ,EK,EW,EY U nits (cont) *Circuit 1 uses th e left condens er co il. Circuit 2 the right. All units have intertwin ed e vaporator coils. †Motor and dri v e shown will deliver approximately 2.5 in. wg net e xternal static pressure. For more inf ormation see T able 3. **Rollout switch is manual reset. NO TE: Hig ...
-
Carrier 48AJ - page 26
26 Table 2 — Operating Weights 48AJ,AK,A W ,A Y Units 48EJ,EK,E W ,EY Units LEGEND *Outdoor-air hoods and filters include d in ba se unit weights; indoor- fan motors are NO T included. NO TES: 1. Base unit weight includes outdoor-air hoods. Base unit weight does NO T include indoor-fan motor . ADD indoor-fan motor , FIOPs, and accessories for T O ...
-
Carrier 48AJ - page 27
27 Table 3 — Evaporat or Fan Motor Dat a NO TES: 1. Motor shaft speed is 1750 rpm. The fan shaft dia meter is 1 15 / 16 inches. 2. All indoor f an motors meet the minim um efficiency requirements as established b y the Energ y P oli cy Act of 1992 (EP ACT), effe ctiv e October 24, 19 97. UNIT SIZE 48AJ,AK, AW, A Y UNIT SIZE 48EJ,EK, EW ,EY MO T O ...
-
Carrier 48AJ - page 28
28 Step 5 — Install Flue Hood 48AJ,AK,A W ,A Y02 0-050 AND 48EJ,EK,EW ,EY024-048 UN IT S — Flue hood is shipped inside gas section of unit. T o install, secure flue hood to access panel. See Fig. 20A. 48AJ,AK,A W ,A Y06 0 AND 48EJ,EK,EW ,EY054-068 UN IT S — Flue hood and wind baf fle are shipped inside gas section of unit. T o install, secure ...
-
Carrier 48AJ - page 29
29 Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection. OP TIONAL ST AGED GAS UNITS — Th e s t ag i n g p a tt e r n is selected based on Heat Stage T ype (HTSTG TYP). Max Capacity per changes default va lue is selected based on Capac- ity Maximum Stage (CAPMXSTG). See T able 4. For ...
-
Carrier 48AJ - page 30
30 Table 5 — Controls Options and Configu rations (Non-Th ermostat Applicatio ns) LEGEND *With DIP Switch No. 5 configured to OPEN (Occupied Heat Enab led). NO TE: Space temperature sensor and remote star t/stop switch are field-supplied. ST AGE D GAS U NI T A PP LI CA TI ONS — The rooftop units may be ordered with an optional factory-installed ...
-
Carrier 48AJ - page 31
31 Features with Thermo stat Control of Unit • two-stage heating • two-stage cooling • control of unit using Y1, Y2 , W1, W2, and G thermostat inputs • control of the indoor fan • outdoor-air temperature/ supply-air temperature monitoring • control of an outdoor air condenser fan based on out- door-air temperature • control of modulat ...
-
Carrier 48AJ - page 32
32 An electronic expansion board may be field-installed to pro- vide the following features: • provide discrete inputs for fa n status, filter status, field- applied status, and demand limit • provide an out put for the external alarm light indicator • provide power exhau st fire outputs for direct control of modulated power exhaust stag es d ...
-
Carrier 48AJ - page 33
33 • control of one stage of heat to maintain return-air tem- perature at heating set point during occupied peri ods • provide a variable frequency drive high voltage relay output to enable VFD • control of heat interlock rel ay • IAQ (Indoor Air Q uality) sensor • OAQ (Outdoor Air Qualit y) sensor • DX compressor lockout o ccurs at 45 ...
-
Carrier 48AJ - page 34
34 LEGEND *Where X is the unit contro l software v ersion number . Fig. 27 — Control Board Diagram CCN — Carr ier Comfort Network N.O. — Normally Op en COM — Common R— Rela y D— Diode SIO — Ser ial Input/Output DIP — Dual In-Line Package SW — Switch LED — Ligh t-Emitting Diode T— T er minal N.C. — Nor mally Closed ...
-
Carrier 48AJ - page 35
35 Table 7 — Electr ical Data — 48AJ, AK,AW,AY Units LEGEND *Fuse or HACR circuit break er per NEC . NO TES: 1. In compliance with NEC requirements for multimotor and combi- nation load equipment (refer to NEC Article s 430 and 440), the ov ercurrent protective de vice f o r the unit shall be fuse or HACR breaker . The Cana dian units ma y be f ...
-
Carrier 48AJ - page 36
36 Table 7 — Electrica l Data — 48AJ,AK,AW, AY Units (cont) LEGEND *Fuse or HACR circuit break er per NEC . NO TES: 1. In compliance with NEC requirements for multimotor and combi- nation load equipment (refer to NEC Article s 430 and 440), the ov ercurrent protective de vice f o r the unit shall be fuse or HACR breaker . The Canad ian units ma ...
-
Carrier 48AJ - page 37
37 Table 7 — Electri cal Data — 48AJ,AK, AW,AY Units (cont) LEGEND *Fuse or HACR circuit break er per NEC . NO TES: 1. In compliance with NEC requirements for multimotor and combi- nation load equipment (refer to NEC Article s 430 and 440), the ov ercurrent protective de vice f o r the unit shall be fuse or HACR breaker . The Cana dian units ma ...
-
Carrier 48AJ - page 38
38 Table 7 — Electrica l Data — 48AJ,AK,AW, AY Units (cont) LEGEND *Fuse or HACR circuit break er per NEC . NO TES: 1. In compliance with NEC requirements for multimotor and combi- nation load equipment (refer to NEC Article s 430 and 440), the ov ercurrent protective de vice f o r the unit shall be fuse or HACR breaker . The Canad ian units ma ...
-
Carrier 48AJ - page 39
39 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units See Legend and Notes on page 42. UNIT SIZE 48EJ,EK, EW ,EY NOMNAL VO L T AG E (3 Ph, 60 Hz) VO L T AG E RANGE COMPRESSOR OFM IFM PO WER EXHA UST COMBUSTION F AN MOT OR PO WER SUPP L Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP* 024 208/230 187 254 39.1 228 2 ...
-
Carrier 48AJ - page 40
40 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units (cont) See Legend and Notes on page 42. UNIT SIZE 48EJ,EK, EW ,EY NOMNAL VO L T AG E (3 Ph, 60 Hz) VO L T AG E RANGE COMPRESSOR OFM IFM PO WER EXHA UST COMBUSTION F AN MOT OR PO WER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FL A F LA LRA FLA MCA MOCP* 034 208/230 187 2 54 5 ...
-
Carrier 48AJ - page 41
41 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units (cont) See Legend and Notes on page 42. UNIT SIZE 48EJ ,EK , EW ,EY NOMNAL VO L T AG E (3 Ph, 60 Hz) VO L T AG E RANGE COMPRESSOR OFM IFM PO WER EXHAUST COMBUSTION F AN MOT OR PO WER SUPPL Y No. 1 No. 2 Min Max RL A LRA RLA LRA Qty Hp FLA (ea) Hp FLA FL A LRA FLA MCA M OCP* 048 208/230 187 254 ...
-
Carrier 48AJ - page 42
42 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units (cont) LEGEND *Fuse or HACR circuit break er per NEC . NO TES: 1. In compliance with NEC requirements for multimotor and combi- nation load equipment (refer to NEC Article s 430 and 440), the ov ercurrent protective de vice f o r the unit shall be fuse or HACR breaker . The Canad ian units ma y ...
-
Carrier 48AJ - page 43
43 Routing Through Bott om of Unit — If wiring is brought in through bottom of unit, use field-supplied watertight conduit to run power wiring from basepan out through bottom 3 1 / 2 -in. hole to the disconnect box and back into unit to the main con- trol box. Use strain relief going into control bo x through 2 1 / 2 -in. di- ameter hole provided ...
-
Carrier 48AJ - page 44
44 SEE DETAIL A DIP SWITCHES (FAR SIDE) SENSOR CONNECTION LOCATION R Y1 Y2 W1 W2 G C X DETAIL A (THERMOSTAT CONNECTION LOCATION) TB3 Fig. 29 — Control Box Di agram (48AJ,AK,AW,AY020- 030 and 48EJ,EK,EW, EY024-034 Units ) LE G END C— Compress or/ Contactor CB — Circuit Breaker CCB — Control Circuit Breaker CR — Control Rela y DIP — Dual ...
-
Carrier 48AJ - page 45
45 Thermostat W iring (CV Only) — Install a Carrier -approved accessory thermostat assembly (per current price pages) according to the installation instructions included with the ac- cessory or these instructions. Locate the thermostat on a solid interior wall in the conditioned space to sense the average temperature. Route the thermostat cable o ...
-
Carrier 48AJ - page 46
46 LEGEND C— Compressor/Contact or FU — Fuse OFC — Outdoor-Fan Contactor CB — Circ uit Br eak er GND — Ground PEC — P ow er Exhaust Controller CCB — Control Circuit Breaker HR — Heater Relay PES — P ow er Exhaust Sequencer CCN — Carr ier Comf or t Network IFC — I ndoor-F a n Circuit PESC — P o wer Exhaust Sequencer Control- ...
-
Carrier 48AJ - page 47
47 Conductors and drain wire must be 20 A WG minimum stranded, tinned copper . Individual conductors must be insulat- ed with PVC, PVC/nylon, vinyl, T eflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or T eflon with a minimum op- erating temperature range of -20 C to 60 C (-4 F to 1 ...
-
Carrier 48AJ - page 48
48 Step 10 — Make Outdoor -Air Inlet Adjustments ECONOMIZER NOTE: If accessory power exhaus t or barometric relief pack- ages are being added to the unit, install power exhaust or baro- metric relief before installing economizer hoods. Economizer Hood Assembly — The economizer hood is shipped in a package secured to the outside of the unit, beh ...
-
Carrier 48AJ - page 49
49 Perform the following procedure to assemble the economiz- er hood. 1. Apply black seal strip (provided in package) to outside top-edge of hood sides. W rap seal strip over edge to cover top flange (6 hood sides). Make sure seal strip covers screw holes. Allow strip to overhang 1 / 8 -in. past the end opposite the mounting flange. See Fig. 36. 2. ...
-
Carrier 48AJ - page 50
50 Minimum Damper Positi on (MDP) Setting — Setting of the outdoor air damper position is performed in conjunction with a shortened version of the field run test. This is performed by first opening DIP (Dual In-line Package) switch no . 4 then no. 6. See Fig. 27 and Direct Digital Controls DIP Switch Con- figuration section on page 63. The outdoo ...
-
Carrier 48AJ - page 51
51 ECONOMIZER SETTINGS Accessory Enthalpy Control (Fig. 46) — The control (HH57AC077) is mounted in the economizer hood. See Fig. 37. The enthalpy setting adjustment is on the enthalpy con- trol. For maximum benefit of outdoor air , set enthalpy control to A. See Fig. 47 and 48. The enthalpy controls operation of the economizer outdoor- air dampe ...
-
Carrier 48AJ - page 52
52 7. Route the wires from the enthalpy sensor to the return air enthalpy control through the holes on the inside of the hinged filter access panel. The holes are blocked by plug buttons which should be removed. 8. Use field-supplied wire ties to attach the violet wire to the + terminal and the blue wire to the SR term inal. 9. Replace economizer f ...
-
Carrier 48AJ - page 53
53 LEGEND RH — Relative Humidity Fig. 48 — Psychrometric Ch art for Enthalpy Control NO TE: P artit ions shown indicate both side supply (A W ,A Y ,EW ,EY) and v er tical supply (AJ ,AK,EJ ,EK) units. Fig. 49 — Economizer Details CONTROL CUR VE CONTROL POINT (APPRO X. DEG.) A T 50% RH F (C) A 73 (23) B 70 (21) C 67 (19) D 63 (17) ...
-
Carrier 48AJ - page 54
54 Step 12 — Install All Accessorie s — After all the factory-installed options have been adjusted, install all field-in- stalled accessories. Refer to th e accessory installation instruc- tions included with each accessory . MOTORMASTER® III CONTROL INST ALLA TION Install Field-Fabricated W ind Baf fles — W ind baf fles must be field-fabric ...
-
Carrier 48AJ - page 55
55 Install Motormaster® III Controls — Only one Motormaster III control is required per unit. Motor — One outdoor -fan motor (OFM) must be changed out in the field to accommodate the Motormaster III accessory . The replacement motor part no. is HD52AK652. For 48AJ,AK,A W ,A Y020-030 and 48EJ,EK,EW ,EY024- 034 units, the Motormaster controlled ...
-
Carrier 48AJ - page 56
56 Fig. 53B — Motormaster® III Sensor Location (48AJ,AK,AW, AY035 and 48EJ,E K,EW,EY0 38, 044) Fig. 53C — M otormaster III S ensor Location (48AJ,AK,AW,AY 040, 050 and 48EJ ,EK ,EW,E Y048 ) Fig. 53D — Motormaster III Sensor Location (48EJ,E K,EW,EY054 -064) Fig. 53E — M otormaster III Sensor Location (48AJ,A K,AW,AY060 and 48EJ ,EK,EW,E Y0 ...
-
Carrier 48AJ - page 57
57 Step 13 — Field Modifications DUCTWORK Bottom Return Units (48A J,AK,EJ,EK) Field-Modified for Side Return — 48AJ,AK and 48EJ,EK units with bottom re- turn air connections may be field-modified to accommodate side return air connections. Conversion to horizontal return requires that the bottom re- turn openings of the unit must be sealed wit ...
-
Carrier 48AJ - page 58
58 ST ART -UP Use the following information and Start-Up Checklist on pages CL-1 and CL-2 to check out unit PRIOR to start-up. Unit Preparation — Check that unit has been installed in accordance with these installa tion inst ructions and applicable codes. Compressor Mounting — Loosen the compressor hold-down bolts until sidewise movement of the ...
-
Carrier 48AJ - page 59
59 Crankcase Heater s — Crankcase heat ers are energized as long as there is power t o the unit, except when the compres- sors are operating. V aria bl e Frequenc y Driv e (VFD) — The variabl e frequency drives are factory set. These settings include fact ory- installed jumpers and software configurations. The only field configured set point is ...
-
Carrier 48AJ - page 60
60 8. Press “READ/WRITE” key , to enter the new va lue. The desired set point value will alternately flash to indicate that the new value has been stored. 9. Fire-speed override mode is available by contact closure between terminals S1 and CC. 10. If the VFD is to be controlled by an external control sys- tem, other than the factory-supplied du ...
-
Carrier 48AJ - page 61
61 Table 13 — Motor Electronic Thermal Protection (tHr) for Toshiba TOSVERT 130-E3 VFD *IFM Letter refers to the 15th digit (Motor Option) of the unit model number TOS HIBA T OSVER T VF-S9 VF D — Th e VF D mus t be powered up, however , since it is located near the indoor fan, operation of the fan is not desirable. T o disable the fan and set t ...
-
Carrier 48AJ - page 62
62 Table 14 — Carrier VFD (Toshiba TOSVERT VF-S9) Program Para meter Values *These settings diff er from the T oshiba defa ults and are required f or Carrier application s. Table 15 — Motor Electronic Thermal Protec tion (tHr) for Tosh iba TOSVERT VF-S9 VFD *IFM Letter refers to the 15th digit (Motor Option) of the unit model number. P ARAMETER ...
-
Carrier 48AJ - page 63
63 P o wer Exhaust — The optional non-modulating power exhaust (CV only) is a two-st age design where the operation of the exhaust fans is linked to economizer position. When the supply fan is running and the economizer is 25% open, the base control board closes contact s, activating 2 (48AJ,AK,A W , A Y020-050 and 48EJ,EK,EW ,EY024-048) or 3 (48 ...
-
Carrier 48AJ - page 64
64 • DIP switch 6 configures the T ime Guard® override and, when used with the field test function, sets the minimum damper position • DIP switch 7 configures the un it for gas heat or electric heat • DIP switch 8 configures the unit for heat pump or air conditioner operation. Crankcase Heater — Units are equipped with crank- case heaters. ...
-
Carrier 48AJ - page 65
65 Table 18 — DIP Switch Factory Setti ngs *On 48EJ,EW ,AJ ,A W units e quipped with staged gas option, DIP switch 7 should be closed. Table 19 — Fan Perfor mance, 48AJ,AK0 20-030 — Vertical Discharge Units LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2- ...
-
Carrier 48AJ - page 66
66 Table 20 — Fan Perf ormance, 48AJ,AK035 — Vert ical Discharge Un its LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 70 cfm/ ...
-
Carrier 48AJ - page 67
67 Table 21 — Fan Perf ormance, 48AJ,AK040, 050 — Vertical Discharge Units LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 70 c ...
-
Carrier 48AJ - page 68
68 Table 22 — Fan Perf ormance, 48AJ,AK060 — Vert ical Discharge Un its LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 70 cfm/ ...
-
Carrier 48AJ - page 69
69 Table 23 — Fan Performance, 48AW,AY0 20-0 30 — Horizontal Discharge Uni ts LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 7 ...
-
Carrier 48AJ - page 70
70 Table 24 — Fan Performanc e, 48AW,AY 035 — Horizontal Discharge Units LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 70 cfm ...
-
Carrier 48AJ - page 71
71 Table 25 — Fan Performan ce, 48AW,AY040,05 0 — Horizontal Discharge Uni ts LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 7 ...
-
Carrier 48AJ - page 72
72 Table 26 — Fan Performanc e, 48AW,AY 060 — Horizontal Discharge Units LEGEND Bhp — Brake Horsepo wer NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton. P er- formance at 70 cfm ...
-
Carrier 48AJ - page 73
73 Table 27 — Fan Performanc e, 48EJ,EK024,034 — Vertical Discharg e Units (For EW ,EY units, reduce net available e xternal static pressure by 0.3 in. wg) LEGEND Bhp — Brake Horsepow er NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb , cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V a ...
-
Carrier 48AJ - page 74
74 Table 28 — Fan Performanc e, 48EJ,EK038,044 — Vertical Discharg e Units (For EW ,EY units, reduce net available e xternal static pressure by 0.5 in. wg) LEGEND Bhp — Brake Horsepow er NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb , cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V a ...
-
Carrier 48AJ - page 75
75 Table 29 — Fan Performance, 48EJ,EK048 — Vertica l Discharge Units (For EW ,EY units, reduce net available e xternal static pressure by 0.5 in. wg) LEGEND Bhp — Brake Horsepow er NO TES: 1. F an perf ormance is based on wet coils, economizer , roof curb , cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab ...
-
Carrier 48AJ - page 76
76 Table 30 — Fan Performance, 48EJ,EK0 54-068 — Vertical Discharge Units LEGEND Bhp — Brake Horsepow er NO TES: 1. F an perf ormance is based on dr y coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton in the cooling mode. P ...
-
Carrier 48AJ - page 77
77 Table 31 — Fan Performance, 48 EW,EY054-068 — Horizontal Dis charge Units LEGEND Bhp — Brake Horsepow er NO TES: 1. F an perf ormance is based on dr y coils, economizer , roof curb, cabinet losses, and clean 2-in. filters. 2. Conv ersion — Bhp to watts: 3. V ar iab le Air V olume units will operate down to 70 cfm/ton in the cooling mode. ...
-
Carrier 48AJ - page 78
78 Table 32A — Fan Performan ce — Power Exhaust, 48AJ,AK,AW,AY020-050 a nd 48EJ,EK,EW ,EY024-048 LEGEND Table 32B — Fan Per formance — Power Exhaus t, 48AJ,AK,AW,AY060 an d 48EJ,EK,EW,EY054-068 LEGEND AIRFLO W (Cfm) LO W SPEED MEDIUM SPEED HIGH SPEED 208 v 230, 460, 575 v 208 v 230, 46 0, 575 v 208 v 230, 460, 575 v ESP Bhp Watts ESP Bhp W ...
-
Carrier 48AJ - page 79
79 Table 33 — Motor Limitati ons LEGEND Bhp — Brake Horsepo wer NO TES: 1. Extensive motor and electrical testing on the Carrier units has ensured that the full horsepower range of the motor can be utilized with confidence . Using your f an motors up to the horsepower r atings shown in the Motor Limitations table will not result in nuisance tri ...
-
Carrier 48AJ - page 80
80 Return-Air Filters — Check that correct filters are in- stalled in filter tracks (see T a bles 1A and 1B). Do not operate unit without return-air filters. Filter Replacement — T o replace filters, open filter ac- cess door (marked with label). Remove inner ac cess panel. Re- move plastic filter retainer in between filter tracks by sliding an ...
-
Carrier 48AJ - page 81
81 Table 35 — User Defined Set Point s LEGEND Table 36 — Software Control Link Points LEGEND SET POINT NAME FORMA T DESCRIPTION LIMITS DEF A UL T OHSP xx.xF Occupied Heat Set P oint 55 to 80 F 68 F OCSP xx.xF Occupied Cool Set P oint 55 to 80 F 78 F UHSP xx.xF Unoccu pied Heat Set P oint 35 to 80 F 5 5 F UCSP xx.xF Unoccu pied Cool Set P oint 7 ...
-
Carrier 48AJ - page 82
82 The T ime Guard® function maintains a minimum off time of 5 minutes, a minimum ON time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds. If the compressors have been off for more than 15 minutes and the OA T (outdoor-air temperature) is less than 45 F , then the safeties will be ignored for 5 minutes. At al ...
-
Carrier 48AJ - page 83
83 GAS HEA TING , V ARIABLE AIR VOLUME (V A V) UN IT S — All of the gas heating control is perfo rmed through the integrated gas control (IGC) board. The control module board serves only to initiate and terminate heating operation. NOTE: The unit is factory-conf igured for disabled occupied heating. DIP switch 5 is used to enable occupied heating ...
-
Carrier 48AJ - page 84
84 Table 37 — Staged Gas Sy stem Components Table 38 — Stage Gas System Inputs/Out puts Operating Modes — The SGC will operate the unit in one of the following operating modes: • no mode • Cooling Mode • Heating1 Mode • Heating2 Mode No Mode — In this mode, none of the heat stages are turned on. No mode occurs if the Cool, Heat or F ...
-
Carrier 48AJ - page 85
85 MORNING W ARM-UP (V A V only with PC Accessed/CCN Op er at io n) — Morning warm-up occurs when the control has been programmed to turn on heat prior to the Occupied mode to be ready for occupancy mode. Morning warm-up is a condi- tion in V A V systems that occurs when the T emperature Com- pensated Start alg orithm calculates a biased occupied ...
-
Carrier 48AJ - page 86
86 Table 40 — Occupied Heat a nd Morning Warm-Up Operation and Controlling Facto rs LEGEND SP ACE TEMPERA TURE SENSOR CONTROL — If the unit is equipped with a field-supplied space sensor and a remote start/stop switch, constant volum e (CV) cooling will operate as follows: Stage 1 cooling begins when there exists a 1.5° F demand and ends when ...
-
Carrier 48AJ - page 87
87 SU PP L Y A IR TE MP ER A TUR E RE SE T — Supply air tem- perature reset is used to rese t the supply-air temperature utility . A 4 to 20 mA signal (field-supplied) is required. The reset op- tion does not require enabling. POWER EXHAUST OPERA TION — P ow e r ex h a us t ha s two options (constant volume and modulating) that have the followi ...
-
Carrier 48AJ - page 88
88 Table 41 — Smoke Cont rol Modes LEGEND HEAD PRESSURE CONTROL — Ea ch u n i t h a s a fa n c y- cling, outdoor thermostat to shut of f the outdoor -fan motor(s) at 55 F (one outdoor-fan motor on 48AJ,AK,A W ,A Y 020-030 and 48EJ,EK,EW ,EY024-034 units, 2 outdoor -fan motors on 48AJ,AK,A W ,A Y035-050 and 48EJ,EK,EW ,EY038-048 units and 3 outd ...
-
Carrier 48AJ - page 89
89 If a Y2 (or Y2_SP T) call begins while the unit was under “Y1 cooling” control, compressor no. 2 will not be started until “Y1 cooling” control has ended. If the Y2 (or Y2_SP T) call ends, with compressor 1 in an unloaded state and compressor 2 ON, then compressor 1 will be immediately brought up to the fully loaded state. If however , t ...
-
Carrier 48AJ - page 90
90 T o inspect blower wheel, remove heat exc hanger access panel. Shine a flashlight into opening to inspect wheel. If clean- ing is required, remove moto r and wheel assembly by remov- ing screws holding motor mounting plate to top of combustion fan housing (Fig. 65 and 66). The motor , scroll, and wheel assembly can be removed from the unit. Remo ...
-
Carrier 48AJ - page 91
91 Lubrication CO MP R ES SO RS — Each compressor is charged with the correct amount of oil at the factory . The correct oil charge is shown in T ables 1A and 1B. If oil is visible in the compressor sight glass, check unit for operating readiness as described in Start-Up section, then start th e unit. Observe oil level and add oil, if required, t ...
-
Carrier 48AJ - page 92
92 5. Be sure that hub flanges, flex members, spacer , and hard- ware are clean and free of oil. 6. Place the flanges onto the shafts with the hub facing out- ward. Do not tighten the set screws at this time. 7. Outside of the unit, assemble the flex members to the cen- ter drive shaft with 4 bolts and nuts. The flex members have collars that need ...
-
Carrier 48AJ - page 93
93 P o wer F ailure — The economizer damper motor is a spring return design. In event of power failure, dampers will re- turn to fully closed position until power is restored. Refrigeran t Charge — Amount of refrigerant charge is listed on unit nameplate and in T ables 1A and 1B. Refer to Carrier G T AC II; Module 5; Charging, Recovery , Recycl ...
-
Carrier 48AJ - page 94
94 Main Burners — Fo r all applications, main burners are factory set and should require no adjustment. MAIN BURNER REMOV AL (Fig. 76) 1. Shut off (field-supplied) manual main gas valve. 2. Shut off power supply to unit. 3. Remove heati ng access panel. 4. Disconnect gas piping from gas valve inlet. 5. Remove wires from gas valve. 6. Remove wires ...
-
Carrier 48AJ - page 95
95 Filte r Drie r — Replace whe never refrigeran t system is ex- posed to atmosphere. Pr otecti ve De vices COMPRESSOR PROTECTION Overcurrent — Each compre ssor has one manual reset, cali- brated trip, magne tic circuit breaker . Do not bypass connec- tions or increase the size of the ci rcuit breaker to correct trou- ble. Determine the cause a ...
-
Carrier 48AJ - page 96
96 Fig. 77 — T ypical Power Sche matic 48EJ,EK,EW, EY024-034; 208 /230-3-60 a nd 460-3-60 NO TES: 1. Connect TRAN1 to H4 for 460 v units. Connect to H3 for 230 v . If 208/230 v units are run with a 208-v power supply , connect to H2. 2. Connect TRAN2 to black lead f or 460 v units. Connect to orange lead f or 230 v units. If 208/230 v units are r ...
-
Carrier 48AJ - page 97
97 Fig. 78 — Typical 48EK VAV 24-V Control Circuit ...
-
Carrier 48AJ - page 98
98 NO TE: Red wire and violet wire are spliced tog ether at the f actory . The brown wire has a wire nut added at the factory . Fig. 79 — Typical CV 24-V Control Circuit ...
-
Carrier 48AJ - page 99
99 Fig. 80 — Typical 48EK VAV 115-V Control Circuit ...
-
Carrier 48AJ - page 100
100 Fig. 81 — Typical 48EJ CV 115-V Control Circ uit ...
-
Carrier 48AJ - page 101
101 Fig. 82 — Label Diagram — Stage d Gas Heat — 48AJ,AK,AW,AY020 -050 and 48EJ,EK,EW,EY02 4-048 Units ...
-
Carrier 48AJ - page 102
102 Fig. 83 — Label Diagram — Sta ged Gas Heat — 48AJ,AK,AW, AY060 and 48EJ,EK,EW,EY054-0 68 Units ...
-
Carrier 48AJ - page 103
103 TROUBLESHOO TING T ypical refrigerant circuiting diagrams are shown in Fig. 84-93. An algorithm diagram of the IGC (Integrated Gas Unit Controlle r) control is shown in Fig. 94. LEGEND Fig. 84 — Typical Refri gerant Circuiti ng (48AJ,AK,AW,AY020 ,025 and 48EJ,EK,EW,EY02 4-034) FPS — F r eeze Protection Switch HPS — High-Pressure Switch LP ...
-
Carrier 48AJ - page 104
104 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-P ...
-
Carrier 48AJ - page 105
105 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 12-Pass 4-Pass 4-Pass 6-Pass 4-Pass 4-Pass 6-Pass 4-Pass 4-Pass 6-Pass 4-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pass 4-Pa ...
-
Carrier 48AJ - page 106
106 LEGEND Fig. 87 — Typical Refr igerant Cir cuiting (48EJ,EK,E W,EY038,044) FPS — F reez e Protection Switch HPS — High-Pressure Switch LPS — Lo w-Pressure Switch ...
-
Carrier 48AJ - page 107
107 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 8-Pass 4-Pass 4-Pass 8-Pass 4-Pass 4-P ...
-
Carrier 48AJ - page 108
108 LEGEN D Fig. 89 — Typical Refrigeran t Ci rcuiting (48EJ,EK,EW, EY048) FPS — F reeze Protection Switch HPS — H igh-Pressure Switch LPS — Lo w-Pr essure Switch ...
-
Carrier 48AJ - page 109
109 LEGEN D Fig. 90 — Typical Refrig erant Circuiti ng (48EJ,EK,E W,EY054 and 058) HPS — High-Pressure Switch LPS — Lo w-Pres sure Swi tch TXV — Thermostatic Expansion V alve ...
-
Carrier 48AJ - page 110
110 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-Pass 4-Pass 4-Pass 4-Pass 6-Pass 4-Pass 6-P ...
-
Carrier 48AJ - page 111
111 LEGEN D Fig. 92 — Typical Refrigeran t Ci rcuiting (48EJ,EK,EW, EY064) HPS — High-Pressure Switch LPS — Lo w-Pres sure Swi tch TXV — Thermostatic Expansion V alve ...
-
Carrier 48AJ - page 112
112 Fi g. 9 3 — T yp ic al R ef ri g er an t Ci rc ui ti ng (4 8E J, EK ,E W, E Y0 68 ) L EGEND HPS — High-Pressure Switch LPS — Lo w-Pressure Switch TXV — Thermostatic Expansion V alve ...
-
Carrier 48AJ - page 113
113 LEGEN D NO TE: Thermostat Fan Switch in the “A U T O” position or sensor-equipped unit. Fig. 94 — IGC Control (Heating and Cooling) IDM — Induced-Draft Motor IGC — Integrated Gas Unit Controller ...
-
Carrier 48AJ - page 114
114 The alarm codes for the IGC control board are shown in T able 44. Table 44 — IGC Control Board LED Alarms Diagnostic LEDs — There a re 3 LEDs (red, yellow , and green) on the lower right hand side of the control board. Th e red light is used to check un it operation and alarms. A constant pulse is normal unit operation. A series of quick bl ...
-
Carrier 48AJ - page 115
115 T ables 46-48 show the input and output channel designations. Table 46 — I/O Channel Designations Base Module — CV Table 47 — I/O Channel Designations Base Module — VAV Table 48 — I/O Channel Designations Expansion Modu le (Field-Installed) — CV and VAV LEGEND (T ables 46-48) NOTE: All ev en numbered terminals are negative (–) pol ...
-
Carrier 48AJ - page 116
Manufacturer reserves the right to disco ntinue, or change at any time, specificatio ns or designs without notice and without inc urring obligations. PC 111 Catalog No . 534-739 Printed in U .S.A. Form 48A,E-1SI Pg 116 107 11-01 Replaces: 48E-6SI Book 1 Ta b 1 a Copy right 2001 Carrier Cor poration SER VICE TRAINI NG Packaged Service T raining prog ...
-
Carrier 48AJ - page 117
CL-1 ST ART -UP CHECKLIST MODEL NO.: _________________________________ SERIAL NO.: ______________________________________ SOFTW ARE VERSION (SEE FIG . 27): ____________ TECHNICIAN: ____________________________________ DA TE: _______________________________________ PRE-ST ART -UP: VERIFY THA T DIP SWITCH SETTINGS ARE CORRECT VERIFY THA T ALL ...
-
Carrier 48AJ - page 118
Manufacturer reserves the right to disco ntinue, or change at any time, specificatio ns or designs without notice and without inc urring obligations. PC 111 Catalog No . 534-739 Printed in U .S.A. Form 48A,E-1SI CL-2 107 11-01 Replaces: 48E -6SI Book 1 Ta b 1 a Copy right 2001 Carrier Cor poration - - - - - - - - - - - - - - - - - - - - - - - - - - ...
Haben Sie eine Frage bezüglich Carrier 48AJ?
Nutzen Sie das untere Formular
Wenn Sie mit Hilfe der gefundenen Bedienungsanleitung Ihr Problem mit Carrier 48AJ nicht gelöst haben, stellen Sie eine Frage, indem Sie das untere Formular nutzen. Wenn einer der Nutzer ein ähnliches Problem mit Carrier 48AJ hatte, ist es möglich, dass er mit Ihnen die Lösung teilen möchte.