Comfort-Aire HEH Series 2 to 5 Tons - Manual (Page 35)

35
Heat Controller, LLC. HEV/H SERIES Installation, Operation & Maintenance
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.
Short test pins
together to enter Test
Mode and speed-up
timing and delays for
20 minutes.
Figure 30: Test Mode Pins
ѥ WARNING! ѥ
ѥ CAUTION! ѥ
UNIT START-UP PROCEDURE
and comparing to Table 10.
d. Check the elevation and cleanliness of the
condensate lines. Dripping may be a sign of a
blocked line. Check that the condensate trap is fi lled
to provide a water seal.
e. Refer to Table 9. 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 10 through 12. Verify correct
water fl ow by comparing unit pressure drop across
the heat exchanger versus the data in Table 10c. 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 Table
10c.
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 9. 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 13. Verify correct water fl ow
by comparing unit pressure drop across the heat
exchanger versus the data in Table 10c. 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 Table 8.
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 FORWARD ALL WARRANTY
REGISTRATION PAPERS TO HEAT CONTROLLER.