Comfort-Aire HTH Series - Manual (Page 33)

33
Installation, Operation & Maintenance HTV/HTD/HTH SERIES Heat Controller, Inc.
Unit Start-Up Procedure
pressure drop across the heat exchanger versus the data
in Tables 9a through 9b. 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 fl ow 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 fi ve (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 Tables
11 through 12. Verify correct water fl ow by comparing
unit pressure drop across the heat exchanger versus the
data in Tables 9a through 9b. 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 fl ow rate in U.S. GPM, determined by
comparing the pressure drop across the heat exchanger to
Tables 9a through 9b.
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.
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.
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 fl ow prior to engaging the compressor.
Freezing of the coax or water lines can permanently
damage the heat pump.