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Aprilaire 1750A - page 1
Model 175 0A / 1 7 7 0A Dehumidifier Installation Instructions READ AND SA VE THESE INSTRUCTIONS CAUTION 1. Read all instructions before beginning installation. 2. Do not use in pool applications. Pool chemicals can damage the dehumidifier . 3. Do not use solvents or cleaners on or near the circuit board. Chemicals can damage circuit board compone ...
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Aprilaire 1750A - page 2
OVERVIEW The Aprilaire ® Dehumidifier is designed to control humidity inside the whole home. The dehumidifier uses a dew point calculation to control the humid ity based on the drynes s set point on the dehumidi fier contr ol. An opti onal Model 70 Living Space Contro l or third- party control can be used in place of the onboar d control. The dehu ...
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Aprilaire 1750A - page 3
SPECIFICA TIONS Dimensions: 20-3/4”W x 24”L x 20-5/8”H Adjustable feet allow for 22-5/8” total height W eight: 1750A – 93 lbs. 1770A – 100 lbs. Capacity: 1750A – 90 pints per day @ 275 CFM 1770A – 135 pints per day @ 500 CFM AHAM DH-1-2003 80°F , 60%RH conditions Power: 1750A – 115 V AC, 8 A, 15 A circuit 1770A – 115 V AC, 14 A ...
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Aprilaire 1750A - page 4
FIGURE 2 – Dimensions and Location Considerations 20-3/4 (527) 24.00 (610) 9-1/2 (241) 10-3/8 (264) 1-1/4 (32) 6-1/2 (165) OFF ON Air Outlet 8 in. Round Collar OFF/ON Switch Drain 2-1/2 (64) 3-7/8 (98) Damper Fully Open Filter Access (Front and Back) Power Cord Air Flow 2-1/2 (64) 20-3/4 (527) 11 (279) 9 (229) 19-5/8 (498) 3 (76) Max. Wiring Acce ...
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Aprilaire 1750A - page 5
FIGURE 3 – Install Damper in Collar 90-1503 FIGURE 4 – Install Collar with Damper on Outlet 90-1503 FIGURE 5 – Minimum Ductwork Bend Distance 90-1503 DUCT COLLARS & BACKFLOW DAMPER The backfl ow damper installs on the outlet side of the dehumidifi er , using featur es molded into the duct collar . 1. Remove the duct collars and backflow d ...
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Aprilaire 1750A - page 6
FIGURE 6 – Drain Trap 90-961 MECHANICAL INST ALLA TION (CONTINUED) DRAIN 1. Adjust feet of dehumi difie r to allow a 2-1/2” minimum clearance for drain trap. See Figure 6 . Use the 90° elbow if necessa ry for clearance restrictions. See Figure 7 . 2. Use PVC primer and cement for drain assembly to the dehumidifi er drain outlet. 3. Complete as ...
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Aprilaire 1750A - page 7
WHOLE-HOME INST ALLA TION (CONTINUED) FIGURE 9 – Whole-Home Basement Installation CONDENSA TE HOSE (TO COMMON DRAIN OR OUTSIDE) AIR IS PULLED FROM RETURN DUCT DEHUMIDIFIED AIR IS SUPPLIED DOWNSTREAM FROM A-COIL TO MINIMIZE EV APORA TION OFF A-COIL A-COIL RETURN DUCT SUPP LY DUCT DEHUMIDIFIER 115 VA C CIRCUIT HV AC / FURNACE FLOOR DRAIN FIGURE 10 ...
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Aprilaire 1750A - page 8
WHOLE-HOME INST ALLA TION (CONTINUED) • HV ACFAN ON:Activatin gtheHV AC fan during dehumidi ficat ionis recomm ended because it offers bett er circul ation and balancing of indoor air conditions. Running the HV AC fan during dehumidification does not affect moisture removal efficiency . If the switch is put i ...
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Aprilaire 1750A - page 9
SPOT INST ALLA TION (CONTINUED) FIGURE 14 – Spot Ducted Installation OUTSIDE AIR TO HOUSE LIVING SP ACE SUPPL Y DUCT RETURN DUCT FLOOR DRAIN DEHUMIDIFIER 115 VA C CIRCUIT EQUIPMENT ROOM CONDENS AT E HOSE (TO COMMON DRAIN OR OUTSIDE) HV AC FURNACE DEHUMIDIFIED AIR IS SUPPLIED TO DUCTED SP ACE AIR IS PULLED FROM AREA GRILLE WITH 8" DUCT COLLAR ...
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Aprilaire 1750A - page 10
CONVERTIBLE INST ALLA TION In this installation the dehumidifier controls humidity in both the whole- home and a spot locatio n. The dehu midif ier will dehumidify the whole home as the first priority , switching to the spot location after the whole-home dehumidification need has been met. Duct ing the unit to the return and suppl y , where air is ...
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Aprilaire 1750A - page 11
CONVERTIBLE INST ALLA TION (CONTINUED) • HV ACFAN ON:Activatin gtheHV AC fan during Whole-Ho medehumid ifica tion is recomme nded beca use it offers bette r circu latio n and balancin g of indoor air condit ions. Running the HV AC fan during dehumi dific ation does not affect moistu re remo val effic iency . ...
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Aprilaire 1750A - page 12
VENTILA TION OR AIR CYCLING The dehumi difie r has outputs avai lable to open a norm ally clos ed damper and introd uce out door air thoug h an outdoo r air intake duct. V entilat ion is cont rolle d by the Cycle Period switches, Cycle T ime potentiometer , and V ent-Auto/Vent-T imed switches. If a normally closed ventilation damper is not installe ...
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Aprilaire 1750A - page 13
VENTILA TION OR AIR CYCLING (CONTINUED) DETERMINE FRESH AIR DELIVERY RATE 1. Measure the negative static pressure of the return system at the location where the outdoor air duct enters the return duct. 2. See T able 4 for estimated inlet airflow in CFM, based on duct type, length, and available negative pressure. Use an airflow measuring device for ...
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Aprilaire 1750A - page 14
VENTILA TION OR AIR CYCLING (CONTINUED) Switch Notes: • Setting theCycle T ime ≥ Cycle Period will result in constant ventilation. • Setting theCycle T imeto OFF willdisable ventilation. 1. Set VENT -AUTO and VENT -TI MED switch . VENT -AUTO restricts ventil ation based on outdoor tempe rature ...
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Aprilaire 1750A - page 15
VENTILA TION OR AIR CYCLING (CONTINUED) SEQUENCE OF OPERATION VENT-TIMED, HVAC INITIATES VENTILATION • V entilat ionwilloccur whenev erthereisanHV ACfan (Gs )orheat(W)callandwillcontinue untiltheventi lationtimehasmetthesetCycle T ime during the set Cycle Perio ...
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Aprilaire 1750A - page 16
MODEL 70 LIVING SP ACE CONTROL WIRING & DIP SWITCH CONFIGURATION TheModel 70 LivingSpace Controlcontains itsown sensorsthat override themain controlsensors onthe dehumidifier . Thepurpose ofutilizing the Model 70 is to have the dehumidi fier contr ol locate d in a liv ing are ...
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Aprilaire 1750A - page 17
THIRD-P ARTY CONTROL WIRING & DIP SWITCH CONFIGURATION An externa l thermos tat with dehum idifi er connect ions can be used as an ON/ OFF dehumi difier control. In this configura tion, the third-par ty control initiates dehumidification and overrides the on-board dehumidifier control logic. The dehumidifier control knob can only be used to ini ...
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Aprilaire 1750A - page 18
SYSTEM CHECKOUT DEHUMIDIFICATION 1. Check the wiring to the HVAC equipment and any accessories if applicable. 2. Plug unit in and turn on/off switch to ON. 3. Rotate the main control knob clockwise to the TEST position. 4. If set up cor rectl y , the dehumidi fier blow er will turn on and the dehumidi fier damp er output will turn on. After 30 seco ...
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Aprilaire 1750A - page 19
TROUBLESHOOTING T ABLE 7 – Green LED Codes Activity Status Solid ON Compressor ON Blinking 1 sec. ON & 1 sec. OFF Sampling Blinking 1/2 sec. ON & 1/2 sec. OFF Defrosting Alternating Green & Red T est Mode T echnical Support is available Monday through Friday , 7:00 a.m. to 5:00 p.m. CST , at (800) 334-6011. Use the guides on the follo ...
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Aprilaire 1750A - page 20
T ABLE 9 – T roubleshooting Guide Symptom Possible Reason T roubleshooting Procedure Dehumi difier does not turn on/run. No power to unit. • Check thatthe dehumidifieris pluggedin. • Check thatthe powerswitch onthe dehumidifieris ON. • Check thatcontrol knobis set ...
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