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IO-123090-GFW-020113 

- 12 - 

©2013 AirMark 

with check valves, remove any extra check valves 
except for the one supplied with the fan coil 

g. The air handler is undersized for space being 
heated 
 
h. Water heater is undersized 
 
Note: All units installed in Massachusetts are 
required to be in compliance with CMR 248 
Massachusetts State Plumbing Code and/or 
Massachusetts Fuel Gas Code. 
 
These codes require the use of an optional pump 
timer to circulate the hydronic loop independent of 
the thermostat. 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Summary of Contents for GFW SERIES

Page 1: ..._________________________ SERIAL ____________________________________________________ INSTALLER __________________________________________________ INSTALLATION DATE ___________________________________...

Page 2: ...dification of the unit to operate with alternative power sources Inspection On receiving the product visually inspect it for any major shipping related damages Shipping damages are the carrier s respo...

Page 3: ...he drain access panel in the bottom of the unit if this is a bottom return application In case of a front return application the front access panel should be removed and discarded If an accessory gril...

Page 4: ...ton is stamped on the piston body Instruction for piston change 1 Turn the 13 16 nut once to release any residual pressure in the coil 2 After ensuring that the coil is free of any residual pressure d...

Page 5: ...ilure to eliminate gaps will impair the proper functioning of the TXV valve It is recommended that the TXV bulb be installed parallel to the ground in a horizontal plane The bulb position should be ab...

Page 6: ...inlet side threaded male port and the outlet side female swivel nut port 6 After ensuring that the white Teflon seal is still in place inside the flowrator body screw the female swivel nut onto the f...

Page 7: ...Note Terminals T and N located on the top right side of the board are not intended for field use and should be left un connected CAUTION The aquastat AQ jumper must be in the OFF position at all times...

Page 8: ...9 Use flexible piping and insulate all pipes Plumbing must be in compliance with state or local codes Code CMR248 in Massachusetts The units for hydronic heat have different top and heater box config...

Page 9: ...To properly check the unit s operation the installer should have an electrical current measuring device 0 10 amp Amprobe Fluke air pressure measuring device 0 1 0 in slope gauge and a temperature mea...

Page 10: ...he equipment The filter s removes dust and debris from the air thus helping to keep your air conditioned space clean More important the filter keeps dust and debris from collecting on the heat transfe...

Page 11: ...er heater BTU INPUT assumes a water heater recovery efficiency of 76 For mild climates BTU INPUT structure s heat loss x 1 51 For colder climates BTU INPUT structure s heat loss x 1 58 3 Pump Replacem...

Page 12: ...ndler is undersized for space being heated h Water heater is undersized Note All units installed in Massachusetts are required to be in compliance with CMR 248 Massachusetts State Plumbing Code and or...

Page 13: ...IO 123090 GFW 020113 2013 AirMark HIGH VOLTAGE disconnect all power sources prior to servicing Failure might lea d to safety hazard Wiring diagram for GFW models...

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