ENGLISH
Installation Manual
27
Installation
7. Shut down pumps and supplementary heat system. Reconnect the hoses placing the water-to-refrigerant
heat
exchanger in the water circulating system.
Vents should be open when the pumps and supplementary heat system are shut down.
- Using Antifreeze
In areas of the country where entering water temperatures drop below 45°F or where piping is being run
through areas subject to freezing, the loop must be freeze protected by using an approved antifreeze
solution to prevent loop water from freezing inside the heat exchanger. Methanol and glycols are the most
commonly used antifreeze solutions. Consult your geothermal unit supplier for locally approved solutions in
your area. Propylene glycol is not recommended in installations where the water temperature are expected
to fall below 30°F. At extreme temperatures, the viscosity increases to the point where normal loop
circulating pumps may not maintain proper flow. If propylene glycol is the only locally approved solution for
anti-freeze, good engineering practices should be used to achieve the desired flow. Calculate the
approximate volume of water in the system by using the requirements detailed in the following table, Water
Volume. Add three gallons to this total to allow for the water contained in the hose kit and geothermal unit.
NOTE
Type of Antifreeze
Minimum Temperature for Freeze Protection
10°F
15°F
20°F
25°F
30°F
Methanol
25%
21%
16%
10%
3%
Propylene Glycol
-
-
-
-
6%
Before energizing the unit, the following system devices must be checked:
• Is the high voltage power supply correct and in accordance with the nameplate ratings?
• Is the field wiring and circuit protection the correct size?
• Is the low voltage control circuit wiring correct per the unit wiring diagram?
• Is the piping system clean/complete and correct? (A recommendation of all system flushing o debris from
the water-to-refrigerant heat exchanger, along with air purging from the water-to-refrigerant heat
exchanger be done in accordance with the Closed-Loop Source Heat Pump Systems Installation Guide).
• Is vibration isolation provided? (i.e. unit isolation pad, hose kits)
• Is unit serviceable? (See clearance specifications).
• Are the low/high-side pressure temperature caps secure and in place?
• Are all the unit access panels secure and in place?
• Is the thermostat in the OFF position?
• Is the water flow established and circulating through all the units?
• Is the duct work (if required) correctly sized, run, taped, insulated and weather proofed with proper unit
arrangement?
• Is the condensate line properly sized, run, trapped and pitched?
• Does the indoor blower turn freely without rubbing?
• Has all work been done in accordance with applicable local and national codes?
• Has heat transfer fluid been added in the proper mix to prevent freezing in closed system application?
• Have the chassis isolation rails been released?
• Is there a good seal between the front air panel and the coil?
Pre-Start-up Checklist
Summary of Contents for AKWW0093AA0
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