Installation, Operation & Maintenance - HNW Series
to submittal 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 load water, and GPM is the flow
rate in U.S. GPM, determined by comparing
the pressure drop across the heat exchanger to
Table 8.
f. Check for vibration, noise, and water leaks.
5. Allow five (5) minutes between tests for pressure to
equalize before beginning cooling test.
a. Place the mode switch (if applicable) in the
"COOL" position. Adjust the unit aquastat to
the highest setting.
b. Slowly lower the aquastat setting to a lower
temperature until the compressor activates.
c. Check for cool load water delivery within a few
minutes after the unit has begun to operate.
d. Verify correct water flow by comparing unit
pressure drop across the heat exchanger versus
the data in Table 8. Refer to Table 7. Check
the temperature of both entering and leaving
source water. If the temperature rise is within
range, proceed with the test. If the temperature
rise is outside of the operating range, check
refrigerant pressures and compare Tables 9 and
10. Heat of rejection (HR) can be calculated for
the source and compared to submittal 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 source water, and GPM is the flow
rate in U.S. GPM, determined by comparing
the pressure drop across the heat exchanger to
Table 8.
e. Cooling capacity, also known as 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 load water, and GPM is the flow
rate in U.S. GPM, determined by comparing
Unit Start Up Procedure
the pressure drop across the heat exchanger to
Table 8.
f. Check for vibration, noise, and water leaks.
6. 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 ensure proper diagnosis and repair of
the equipment.
7. When testing is complete, set system to maintain
desired comfort level.
8. BE CERTAIN TO FILL OUT AND RETURN ALL
WARRANTY REGISTRATION PAPERWORK.
�
WARNING!
�
Verify ALL water controls are open and allow water flow
prior to engaging the compressor. Freezing of the heat
exchanger or water lines can permanently damage the
heat pump.
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