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IO-123090-GFW-020113 

- 5 - 

©2013 AirMark 

7)  Slide the 13/16 nut onto the distributor 

body. 

8) Tighten the nut to a torque of 

approximately 10-30 ft-lbs. Do 

NOT

 

over 

tighten the nut. This will hamper the piston 
movement during operation.  

9)  Slide the grommet back to position to 

prevent air leakage. 

 

 

TXV Coils: 

 

WARNING

  The sensing bulb and TXV body 

MUST

 be protected from overheating during 

brazing. The sensing bulb and TXV body must be 
covered using a quench cloth or wet cloth when 
brazing. Pointing the brazing flame away from the 
valve and sensing bulb provide partial protection 
only.  

 

 

CAUTION

  Ensure that the TXV selected is 

compatible with the refrigerant used in the outdoor 
system (R22 or R410A). TXV caps are painted 
green for R22 or pink for R410A. In absence of 
color, the caps will be marked with the compatible 
refrigerant. 

 

 

CAUTION

 The valves should be sized 

according to the capacity of the outdoor unit. 
Failure to install the right valve can lead to poor 
performance and possible compressor damage.  

 

TXV Bulb Mounting 

 

The orientation and location of the TXV bulb has a 
major influence on the system performance.  

 

CAUTION

   Ensure that the TXV bulb is in 

direct contact with the suction/vapor line. Gaps 
between the bulb and tube should be avoided. 
Failure 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 above and between 4 
o’clock and 8 o’clock. Fig. 4 shows the 
recommended position for the TXV bulb installation 
in the horizontal plane. 

 

The TXV sensing bulb 

SHOULD

 be mounted using 

the metal clamp provided. In order to obtain a good 
temperature reading and correct superheat control, 

the TXV sensing bulb must conform to ALL of the 
following criteria: 

 

1)  The sensing bulb 

MUST

 be in direct and 

continuous contact with the suction line 

2) The sensing bulb should be mounted 

horizontally on the suction line. 

3)  The sensing bulb must be mounted above 

and between the 4 and 8 o’clock position 
on the circumference of the suction line. 

4)  The sensing bulb 

MUST

 be insulated from 

outside air. 

 

TXV BULB POSITION
4 O'CLOCK OR
8 O'CLOCK 

METAL STRAP

SUCTION/VAPOR LINE

 

 

Fig.4. Recommended location of the TXV bulb in a 
horizontal orientation 
 

The mounting location and insulation guards the 
sensing bulb from false reading due to hot outside 
air or liquid refrigerant formed inside the 
suction/vapor line. 
 
As recommended earlier, the TXV sensing bulb 
should be mounted in a horizontal plane in relation 
to the suction/vapor line. However, in case such a 
mounting is not feasible and the sensing bulb has 
to be mounted vertically; then place the bulb as 
shown in Fig.5.  
 

Содержание GFW SERIES

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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