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Greenheck Fan VSU - 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 VSU - 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 ...
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Greenheck Fan VSU - page 3
3 Model VSU Make-Up Air ® ® ® ® ® T able of Contents Installation Filter/Stand Section . . . . . . . . . . . . . . . . . . . . . . 3-4 Burner/Blower Section ..................... 4 Ductwork ................................ 4 D i m e n s i o n a l D a t a ......................... 5 D i r e c t G a s P i p i n g ........................ 6 - 7 S ...
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Greenheck Fan VSU - page 4
4 Model VSU Make-Up Air ® ® ® ® ® 2. 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 can be caulked together , but it is not needed with the water kickouts provided with this section. 3. Install Ductwork This table sho ...
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Greenheck Fan VSU - page 5
5 Model VSU Make-Up Air ® ® ® ® ® Unit Dimensional Data Blower Dimensional Data Unit W eight Housing Size A B C E Filters Blower Size F H J K Blower/Heater* Stand/Filter 40 111 54 95 144 (20) 20x25 220 26 20 68 12 2000 lbs. 700 lbs. All dimensions are shown in inches. * Weights will vary with blower and horsepower . Dimensional Data Upblast Di ...
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Greenheck Fan VSU - page 6
6 Model VSU Make-Up Air ® ® ® ® ® Installation of Dir ect Gas Piping IMPORT ANT All gas piping must be installed in accordance with the latest edition of the National Fuel Gas Code ANSI/Z223.1 and any local codes that may apply. In Canada, the equipment shall be installed in accordance with the Installation Code for Gas Burning Appliances and ...
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Greenheck Fan VSU - page 7
7 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. 4. Pipe the Optional V ent Line If ...
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Greenheck Fan VSU - page 8
8 Model VSU Make-Up Air ® ® ® ® ® Start-Up - Blower 1. Check the V oltage Before starting the unit, compar e the supplied voltage, hertz, and phase with the unit and motor’ s nameplate information. 2. Check the Blower Rotation Open the blower access door and run the blower momentarily to determine the rotation. Arrows ar e placed on the blow ...
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Greenheck Fan VSU - page 9
9 Model VSU Make-Up Air ® ® ® ® ® 6. Set-up Optional Components Adjust the settings on the optional components. See the Control Center Layout in the Refer ence section for location of optional components. • Heating Inlet Air Sensor T ypical setting: 60-70ºF NOTE The most accurate way to measure the air volume is by using a pitot traverse me ...
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Greenheck Fan VSU - page 10
10 Model VSU Make-Up Air ® ® ® ® ® 1. Check the Supply Gas Pressur e Check the supply gas pressur e and compare it with the unit’ s nameplate pressur e requir ements. Adjust the supply regulator as needed until the supply gas pressur e is within the specified range. The direct gas nameplate is located on the outside of the unit on the contr ...
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Greenheck Fan VSU - page 11
11 Model VSU Make-Up Air ® ® ® ® ® 4. Set the Maximum Firing Rate Monitor the unit’ s actual temperature rise by placing a thermocouple in the unit’ s inlet and a second in the discharge, three duct diameters downstr eam of the burner . Send the unit to maximum fire by disconnecting and isolating the wire connected to T erminal 4 on the M ...
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Greenheck Fan VSU - page 12
12 Model VSU Make-Up Air ® ® ® ® ® 6. Set the Unit’s Operating Temperature Set the operating temperature. The operating temperature setting depends on which Maxitr ol controller is used. IMPORT ANT If the flame signal is not above 1.25 VDC and steady, consult the troubleshooting section. 7. Flame Signal Check T o measure the flame signal co ...
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Greenheck Fan VSU - page 13
13 Model VSU Make-Up Air ® ® ® ® ® Direct Gas Burner Sequence 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 present at burner • Initi ...
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Greenheck Fan VSU - page 14
14 Model VSU Make-Up Air ® ® ® ® ® 115 V AC between terminals 102 and 101? Check Main V oltage (See Blower Start-Up Step #1) Main Disconnect (DS1) Off (T urn Main Disconnect DS1 On) Primary Fuses Blown (Replace Fuses) Main T ransformer Defective (Replace T ransformer) 24 V AC between terminals R and X? Main T ransformer Defective (Replace T ra ...
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Greenheck Fan VSU - page 15
15 Model VSU Make-Up Air ® ® ® ® ® Heater Does Not Operate 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 Wir ed (Wire Heat Switch (S4)) 115 V AC between terminals 102 and 101? Primary Fuses Blown (Replace Fuses) Main T ransform ...
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Greenheck Fan VSU - page 16
16 Model VSU Make-Up Air ® ® ® ® ® Heater Does Not Operate 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. (Direct Gas Start-Up Step #1) Air in the gas line? Purge gas line (V erify gas at the pilot) Check for proper pilot ...
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Greenheck Fan VSU - page 17
17 Model VSU Make-Up Air ® ® ® ® ® Heater Does Not Operate 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 (Direct Gas Start-Up Step #3) Does the flame signal remain constant? A ...
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Greenheck Fan VSU - page 18
18 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 de? ...
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Greenheck Fan VSU - page 19
19 Model VSU Make-Up Air ® ® ® ® ® Bearings The bearings for Greenheck fans ar e carefully 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 Lubricat ...
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Greenheck Fan VSU - page 20
20 Model VSU Make-Up Air ® ® ® ® ® Typical Control Center Layout Refer ence 1. Spark Generator 2. T emperature Selector 3. Amplifier 4. 24V T ransformer 5. 120V T ransformer 6. T ransformer Fuses 7. Motor Fuses 8. Heating Inlet Air Switch 9. Flame Safeguard 10. High Limit Switch 11. Disconnect 12. Soft Start 1. Spark Generator 2. T emperatur ...
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Greenheck Fan VSU - page 21
21 Model VSU Make-Up Air ® ® ® ® ® Start-Up Checklist Unit Model Number _______________________________ (e.g. VSU-220-H40-UB) Unit Serial Number _______________________________ (e.g. 04c99999 or 10111000) Start-Up Date _______________________________ Start-Up Personnel Name __________________________ Start-Up Company __________________________ ...
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Greenheck Fan VSU - page 22
22 Model VSU Make-Up Air ® ® ® ® ® Maintenance Log Date __________________ Time _____________ AM/PM Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _____________________________________________ ...
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Greenheck Fan VSU - page 23
23 Model VSU Make-Up Air ® ® ® ® ® Maintenance Log Date __________________ Time _____________ AM/PM Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _____________________________________________ ...
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Greenheck Fan VSU - page 24
24 457831 • Model VSU IOM, Rev . 3, Mar ch 2009 Copyright 2009 © Greenheck Fan Corporation 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 ou ...
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