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Heat Controller, Inc.
WARNING!
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.
WARNING!
WARNING! Verify ALL water controls are open and allow
water flow prior to engaging the compressor. Freezing of
the coax or water lines can permanently damage the heat
pump.
1. Turn thermostat fan position to "ON". Blower should start.
2. Balance air flow at registers.
3. Adjust all valves to their full open position. Turn on the
line power to all heat pump units.
4. Operate unit in cooling cycle. Room temperature should
be approximately 45-100°F [7-38°C] DB. For Start-up
check, loop water temperature entering the heat pumps
should be between 45°F [7°C] and 110°F [43°C].
5. Two factors determine the operating limits of a Heat
Controller HKV System– (a) return air temperature, and
(b) water temperature. When any one of these factors is at
a minimum or maximum level, the other factor must be at
normal levels to ensure proper unit operation.
a. Adjust the unit thermostat to the warmest position.
Slowly reduce thermostat setting until the
compressor activates.
b. Check for cool air delivery at the unit grille within a
few minutes after the unit has begun to operate.
Note: Units have a five minute time delay in the control
circuit that can be eliminated on the CXM PCB as
shown below in Figure 14. See controls description for
detailed features of the control.
c. Verify that the compressor is on and that the water
flow rate is correct by measuring pressure drop
through the heat exchanger using the Pete's
plugs and comparing to Table 7.
d. Check the elevation and cleanliness of the
condensate lines. Dripping may be a sign of a
blocked line. Check that the condensate trap
includes a water seal.
e. Refer to Table 9. Check the temperature of both
supply and discharge water. If temperature is within
range, proceed with test. If temperature is outside
operating range, check cooling refrigerant pressures
in Table 8. Verify correct water flow by comparing
unit pressure drop across the heat exchanger
versus the data in Table 9. Heat of rejection can be
calculated and compared to specification catalog.
f. Check air temperature drop across the coil when
HKV LArge CommerCiAL
compressor is operating. Air temperature should
drop between 15°F [8°C] and 25°F [14°C].
g. Turn thermostat to "OFF" position. A hissing noise
indicates proper functioning of the reversing valve.
6. Operate the heat pump in the heating cycle immediately
after checking cooling cycle operation. Allow five (5)
minutes between tests for pressure to equalize or cycle the
reversing valve to equalize.
a. Turn thermostat to lowest setting and set thermostat
switch to "HEAT" position.
b. Slowly turn thermostat to a higher temperature until
the compressor activates.
c. Check for warm air delivery at the unit grille within a
few minutes after the unit has begun to operate.
d. Check the temperature of both supply and discharge
water. Refer to Table 8. If temperature is within
range, proceed with test. If temperature is outside
operating range, check heating refrigerant pressures
in Table 8.
e. Check air temperature rise across the coil when
compressor is operating. Air temperature should
rise between 20°F [11°C] and 30°F [17°C]. Heat
of extraction can be calculated and compared to
specification catalog.
f. Check for vibration, noise, and water leaks.
7. If unit fails to operate, perform troubleshooting analysis
(CXM manual). 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.
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, INC.
Note: If performance during any mode appears
abnormal, refer to the troubleshooting section of CXM
manual. To obtain maximum performance the air coil
should be cleaned before start-up. A 10% solution of
dishwasher detergent and water is recommended.
Figure 11: Test Mode Pins
38
IOM Instructions
Unit Start Up Procedure
Short test pins together to
enter Test Mode and speed-
up timing and delays for 20
minutes.
CXM Board
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Troubleshooting
