R e s i d e n t i a l H & V - 6 0 H z H F C - 4 1 0 A :
R e v : O c t o b e r 5 , 2 0 2 1
40
G e o t h e r m a l H e a t i n g a n d Co o l i n g
Unit Start-Up Procedure
e. Refer to Table 10. Check the temperature of both
entering and leaving water. If temperature is within
range, proceed with the test. If temperature is
outside of the operating range, check refrigerant
pressures and compare to Table 11. Verify correct
water flow by comparing unit pressure drop across
the heat exchanger versus the data in Table 9. Heat
of rejection (HR) can be calculated and compared to
catalog data capacity pages. The formula for HR for
systems with water is as follows:
HR = TD x GPM x 500, where TD is the temperature
difference between the entering and leaving water,
and GPM is the flow rate in U.S. GPM, determined
by comparing the pressure drop across the heat
exchanger to Tables 9a through 9b.
f. Check air temperature drop across the air coil when
compressor is operating. Air temperature drop should
be between 15°F and 25°F [8°C and 14°C].
g. Turn thermostat to “OFF” position. A hissing noise
indicates proper functioning of the reversing valve.
6. Allow five (5) minutes between tests for pressure to
equalize before beginning heating test.
a. Adjust the thermostat to the lowest setting. Place
the thermostat mode switch in the “HEAT” position.
b. Slowly raise the thermostat to a higher temperature
until the compressor activates.
c. Check for warm air delivery within a few minutes
after the unit has begun to operate.
d. Refer to Table 10. Check the temperature of both
entering and leaving water. If temperature is within
range, proceed with the test. If temperature is
outside of the operating range, check refrigerant
pressures and compare to Table 11. Verify correct
water flow by comparing unit pressure drop across
the heat exchanger versus the data in Table 9. Heat
of extraction (HE) can be calculated and compared
to submittal data capacity pages. The formula for
HE for systems with water is as follows:
HE = TD x GPM x 500, where TD is the temperature
difference between the entering and leaving water,
and GPM is the flow rate in U.S. GPM, determined
by comparing the pressure drop across the heat
exchanger to Table 9.
e. Check air temperature rise across the air coil when
compressor is operating. Air temperature rise should
be between 20°F and 30°F [11°C and 17°C].
f. Check for vibration, noise, and water leaks.
7. If unit fails to operate, perform troubleshooting analysis
(see troubleshooting section). If the check described
fails to reveal the problem and the unit still does not
operate, contact a trained service technician to insure
proper diagnosis and repair of the equipment.
8. When testing is complete, set system to maintain
desired comfort level.
9. BE CERTAIN TO FILL OUT AND RETURN ALL
WARRANTY REGISTRATION PAPERWORK.
⚠
WARNING!
⚠
⚠
CAUTION!
⚠
WARNING!
When the disconnect switch is closed, high
voltage is present in some areas of the electrical panel.
Exercise caution when working with energized equipment.
CAUTION!
Verify that ALL water control valves are open
and allow water flow prior to engaging the compressor.
Freezing of the coax or water lines can permanently
damage the heat pump.
Note: If performance during any mode appears abnormal,
refer to the CXM section or troubleshooting section of this
manual. To obtain maximum performance, the air coil should
be cleaned before start-up. A 10% solution of dishwasher
detergent and water is recommended.
