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Greenheck Fan 470654 - page 1
1 Model VSU Make-Up Air Unit Installation, Operation and Maintenance Manual Please read and save these instructions. Read car efully before attempting to assemble, install, operate or maintain the product described. Pr otect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury ...
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Greenheck Fan 470654 - page 2
2 Model VSU Make-Up Air ® Inspection and Maintenance during Storage While in storage, inspect fans once per month. Keep a recor d of inspection and maintenance performed. If moisture or dirt accumulations ar e found on parts, the source should be located and eliminated. At each inspection, rotate the fan wheel by hand ten to fi fteen revolutions ...
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Greenheck Fan 470654 - page 3
3 Model VSU Make-Up Air ® T able of Contents General Safety Information .................... 1 Receiving, Handling and Storage ............... 2 Product Overview ............................ 4 Subassembly Overview: Filter Section / V ertical Mounting Stand .......... 4 Optional Service Platform ..................... 4 Burner , Blower and Control C ...
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Greenheck Fan 470654 - page 4
4 Model VSU Make-Up Air ® Subassemblies Filter Section / Vertical Mounting Stand The filter section of the unit is factory installed in the mounting stand and shipped ready for installation on the concrete mounting pad. Each filter unit has a lar ge access panel on the control end of the unit except for the housing size 50, which has an access d ...
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Greenheck Fan 470654 - page 5
5 Model VSU Make-Up Air ® Burner , Blow er and Control Center Section The burner section, blower section and control center of the unit are all combined into one assembly which is installed in the field on top of the filter and stand section. The burner section is the lowest part of the burner / blower unit and it sits directly on the filter as ...
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Greenheck Fan 470654 - page 6
6 Model VSU Make-Up Air ® Burner Subassembly The burner subassembly consists of the gas train with its controls, valves, pr essure r egulator , bur ner(s), and combustion chamber . The primary gas connection to the gas train is made through the side wall gr ommet into the factory-supplied female pipe fitting. Gas T rain (Burner Subassembly) Contr ...
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Greenheck Fan 470654 - page 7
7 Model VSU Make-Up Air ® Burner/Blower Section Use a crane and a spreader bar hooked to the factory lifting lugs (shown below) to lift and center the unit onto the filter stand section. The sections should be caulked together . Install Ductwork This table shows the duct sizes and straight lengths recommended for optimal performance (AMCA Publica ...
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Greenheck Fan 470654 - page 8
8 Model VSU Make-Up Air ® Complete Installation A typical horizontal dischar ge installation is shown. Gas and/or electrical lines can be connected at this time. For upblast units, a duct elbow may be needed to turn the ductwork into the building. Follow proper ductwork methods recommended by AMCA to make this elbow to minimize duct losses. Instal ...
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Greenheck Fan 470654 - page 9
9 Model VSU Make-Up Air ® 5. Fasten three (3/8 in. x 1 - 1 /2 in.) hex head bolts into the side of the pl atfo rm base. Se cure e ach bo lt with t wo (3/8 in .) he x head nuts placed back to back on each b olt a s shown in Figure B. T hese bolts will b e use d to at tach the p lat form ba se to the unit. 6. Facing the contr ol pane l side of the u ...
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Greenheck Fan 470654 - page 10
10 Model VSU Make-Up Air ® Installation of Electrical W iring IMPORT ANT Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached on the inside of the control center door(s). IMPORT ANT All wiring should be done in accordance with the latest edition of the Nation ...
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Greenheck Fan 470654 - page 11
11 Model VSU Make-Up Air ® Installation of Dir ect Gas Piping Determine the Supply Gas Requirements The unit’ s direct gas nameplate states the r equirements for the gas being supplied to the unit. The direct gas nameplate is located on the outside of the unit on the control center side. T ype of gas “ WC “ WC “ WC F PSI “ WC “ WC MAX ...
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Greenheck Fan 470654 - page 12
12 Model VSU Make-Up Air ® V ent Line Solenoid T o Burner V ent Line T o Outdoors From Supply Safety Shut-off V alves Optional V ent Line W ARNING NEVER test for a gas leak with an open flame. NOTE The factory piping has been checked for leaks, but should be rechecked due to shipping and installation. Connect the Supply Gas Line A manual shut off ...
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Greenheck Fan 470654 - page 13
13 Model VSU Make-Up Air ® Unit Model Number _______________________________ (e.g. VSU-H20) Unit Serial Number _______________________________ (e.g. 10111000) Start-Up Date _______________________________ Start-Up Personnel Name __________________________ Start-Up Company _______________________________ Phone Number _______________________________ ...
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Greenheck Fan 470654 - page 14
14 Model VSU Make-Up Air ® NOTE The most accurate way to measure the air volume is by using a pitot traverse method downstream of the blower. Other methods can be used, but should be proven and accurate. IMPORT ANT Changing the air volume can significantly increase the motor’s amps. If the air volume is changed, the motor’s amps must be checke ...
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Greenheck Fan 470654 - page 15
15 Model VSU Make-Up Air ® Set-Up Optional Components Adjust the settings on the optional components. See the unit’ s specific wiring diagram located on the access door or the unit. • Heating Inlet Air Sensor T ypical setting: 60-70ºF • Building Freeze Pr otection T ypical setting: 5 minutes; 45ºF • Dirty Filter Gauge T ypical setting: ...
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Greenheck Fan 470654 - page 16
16 Model VSU Make-Up Air ® IMPORT ANT Proper air velocity over the burner is critical on direct- fired gas units. If the air velocity is not within the unit specifications, the unit will not operate efficiently, may have sporadic shutdowns, and may produce excessive carbon monoxide (CO) or other gases. The proper static pr essure should be between ...
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Greenheck Fan 470654 - page 17
17 Model VSU Make-Up Air ® IMPORT ANT Setting the maximum firing rate during mild weather conditions may cause the high limit to trip out during extreme conditions requiring manual resetting. NOTE Gas trains are equipped with either separate regulators and modulating valves or with a combined modulating valve. NOTE Clockwise rotation increases the ...
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Greenheck Fan 470654 - page 18
18 Model VSU Make-Up Air ® IMPORT ANT If the flame signal is not above 1.25 VDC and steady, consult the troubleshooting section. Flame Signal Check - Pilot Ignition T o measure the flame signal connect a standar d DC voltmeter to the flame amplifier test jacks + and - (com) as shown to the right. The flame signal should be above 1.25 VDC and s ...
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Greenheck Fan 470654 - page 19
19 Model VSU Make-Up Air ® Building Pressur e Control — a variable frequency drive is controlled accor ding to input from a pressur e sensing device. T ur n both knobs to the upper most pressur e setting. Y ou may have to remove the outdoor pressur e tap tubing. V AV systems should go to maximum speed. Set both knobs at the lowest setting and th ...
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Greenheck Fan 470654 - page 20
20 Model VSU Make-Up Air ® Operation - Recir culating Units (optional) NOTE Blower Start-Up, as shown on page 14, should be performed before the blower is run. Recirculation Operation The recir culation operation option is recommended when the ventilation equipment provides the primary source of heating for the space. A minimum of 20% outdoor air ...
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Greenheck Fan 470654 - page 21
21 Model VSU Make-Up Air ® Direct Gas Burner Sequence - Pilot Ignition 1. Supply Fan Contact Closed • Power passes to the supply fan and heat switch 2. Heat Contact Closed • Power passes to the heat relay then to the Flame Safeguard 3. Flame Safeguard (FSG) Sequence • Checks for proper airow • V eries no ame pr esent at burner • ...
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Greenheck Fan 470654 - page 22
22 Model VSU Make-Up Air ® Blower Does Not Operate T r oubleshooting Proper supply power at main disconnect Check main voltage. Reference: Start-Up - Blower , Check the V oltage, pg. 14 Main disconnect (DS1) off. T urn main disconnect (DS1) on. Primary fuses blown. Replace fuses. 24 V AC between terminals R and X? Main transformer (TR1) defective. ...
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Greenheck Fan 470654 - page 23
23 Model VSU Make-Up Air ® Motor Overamps T r oubleshooting Air volume too high? Adjust drives or increase external static pressur e as needed. Reference: Start-Up - Blower , Air V olume Measurement and Check, pg. 14 Motor horsepower too low? Resize motor . Motor voltage correct? Provide pr oper power supply . Reference: Start-Up - Blower , Check ...
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Greenheck Fan 470654 - page 24
24 Model VSU Make-Up Air ® Insufficient Airflow T r oubleshooting Damper(s) not fully opened? Adjust damper linkage(s), or replace faulty actuator(s). Damper actuators may take a few minutes to open. Filters dirty or clogged Clean or replace filters. Reference: Maintenance - Routine, Filters, pg. 31 Blower speed too low? Adjust drives as needed. ...
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Greenheck Fan 470654 - page 25
25 Model VSU Make-Up Air ® Excessive Noise or Vibration T r oubleshooting Sheaves aligned? Align sheaves. Reference: Maintenance - Routine, V -Belt Drives, pg. 31 Wheel unbalanced? Clean and/or balance wheel(s). Belts worn or loose? Replace worn belts or tighten loose belts. Reference: Maintenance - Routine, V -Belt Drives, pg. 31 Ye s Ye s No No ...
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Greenheck Fan 470654 - page 26
26 Model VSU Make-Up Air ® Heater Does Not Operate (Pilot Ignition) Does not attempt to light (No visible spark) T r oubleshooting 24 V AC between terminals W1 and X? Heat switch (S4) off. T urn heat switch (S4) on. Heat switch not wired. Wire heat switch (S4). 115 V AC between terminals 102 and 101? Primary fuses blown. Replace fuses. Main transf ...
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Greenheck Fan 470654 - page 27
27 Model VSU Make-Up Air ® Heater Does Not Operate (Pilot Ignition) Attempts to light, but no pilot (visible spark) T r oubleshooting Gas pressur e between the minimum and maximum shown on the direct gas label? Check inlet gas pressur e. Reference: Start-Up - Direct Gas, Check the Supply Gas Pressure, pg. 27 Air in the gas line? Purge gas line. V ...
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Greenheck Fan 470654 - page 28
28 Model VSU Make-Up Air ® Heater Does Not Operate (Pilot Ignition) Visible pilot T r oubleshooting Flame signal greater than 1.25 VDC Measure the flame signal when there is a visible pilot Pressur e drop acr oss the burner between 0.625 and 0.675 in. WC? Check for proper airflow Reference: Start-Up - Direct Gas, Set the Burner Air Pressure Diff ...
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Greenheck Fan 470654 - page 29
29 Model VSU Make-Up Air ® Heater Does Not Operate (Direct Spark) Does not attempt to light (No visible spark) T r oubleshooting 24 V AC between terminals W1 and X? Heat switch (S4) off. T urn heat switch (S4) on. Heat switch not wired. Wire heat switch (S4). 24 V AC between terminals 22 and 21? Main transformer (TR2) defective. Replace transforme ...
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Greenheck Fan 470654 - page 30
30 Model VSU Make-Up Air ® Heater Does Not Operate (Direct Spark) Attempts to light, but no flame (Visible spark) T r oubleshooting Check inlet gas pressur e. Reference: Start-Up - Direct Gas, Check the Supply Gas Pressure, pg. 15 Is the low fire set pr operly? Reference: Start-Up - Direct Gas, Set the Minimum Firing Rate, pg. 17 Gas pressur e b ...
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Greenheck Fan 470654 - page 31
31 Model VSU Make-Up Air ® Maintenance - Routine CAUTION Lock-out the gas and the electrical power to the unit before performing any maintenance or service operations to this unit. V -Belt Drives V -belt drives must be checked on a regular basis for wear , tension, alignment, and dirt accumulation. Check the tension by measuring the deflection in ...
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Greenheck Fan 470654 - page 32
32 Model VSU Make-Up Air ® Bearings The bearings for the fans are car efully selected to match the maximum load and operating conditions of the specific class, arrangement and fan size. The instructions provided in this manual and those pr ovided by the bearing manufacturer will minimize any bearing problems. IMPORT ANT Lubricate bearings prior t ...
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Greenheck Fan 470654 - page 33
33 Model VSU Make-Up Air ® Refer ence T ypical Gas T rain Layout with Modulating V alve (Pilot Ignition) High Gas Pressur e Switch (optional) Low Gas Pressur e Switch (optional) Manual Pilot Shut-Off V alve Pilot Regulator Pilot Solenoid Burner Gas Pressur e T est Port Burner Differential Pressur e Sensor Pilot Gas Pressur e T est Port Burner Manu ...
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Greenheck Fan 470654 - page 34
34 Model VSU Make-Up Air ® Burner Differential Pressur e Sensor (Airflow Switch) Burner Manual Shut-Off V alve High Gas Pressur e T est Port High Gas Pressur e Switch (Optional) Modulating V alve T o Burner Combination Shut-Off V alve/ Regulator Low Gas Pressur e T est Port Low Gas Pressur e Switch (Optional) Gas Connection T ypical Gas T rain Lay ...
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Greenheck Fan 470654 - page 35
35 Model VSU Make-Up Air ® Control Center Layout Dirty Filter Switch Refer ence 13 22 26 28 27 20 15 21 4 1 78 29 3 5 16 23 17 18 19 14 25 10 12 11 6 24 1. Supply Motor Starter — 24 volt magnetic contacts for starting supply motor . 2. Supply Overload — pr ovides electronic overload protection to supply motor . 3. Low V oltage T ransformer — ...
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Greenheck Fan 470654 - page 36
36 Greenheck warrants this equipment to be fr ee from defects in material and workmanship for a period of one year fr om the shipment date. Any units or parts which prove defective during the warranty period will be r eplaced at our option when returned to our factory , transportation prepaid. Motors ar e warranted by the motor manufacturer for a p ...
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