Comfort-Aire HBH Series 1/2 to 5 Ton - Manual (Page 33)

Heat Controller, Inc. HBH/V COMPACT IOM Instructions
Unit Start-up Procedure
1. Turn the thermostat fan position to “ON”. Blower
should start.
2. Balance air flow at registers.
3. Adjust all valves to their full open positions. Turn on
the line power to all heat pumps.
4. Room temperature should be within the minimum-
maximum ranges of table 6. During start-up checks,
loop water temperature entering the heat pump
should be between 60°F [16°C] and 95°F [35°C].
5. Two factors determine the operating limits of Heat
Controller heat pumps, (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 level to insure proper unit operation.
a. Adjust the unit thermostat to the warmest setting.
Place the thermostat mode switch in the “COOL”
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
control board as shown below in Figure 23. See
controls description for details.
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 P/T plugs
and comparing to tables 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
filled 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 8a through
8d. Verify correct water flow by comparing unit
pressure drop across the heat exchanger versus
the data in tables 7. Heat of rejection (HR) can
be calculated and compared to submittal data
capacity pages. The formula for HR for systems
with water is as follows:
HR (Btuh) = 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 7. In S.I. units,
the formula is as follows: HR (kW) = TD x l/s x
4.18.
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 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 8a through 8d. Verify correct
water flow by comparing unit pressure drop across the
heat exchanger versus the data in tables 8a through
8d. 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 (Btuh) = 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 10a through
10e. In S.I. units, the formula is as follows: HE
(kW) = TD x l/s x 4.18.
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.
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.
Unit Start-Up Procedure