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UNIT STARTUP PROCEDURE
1.
Turn the thermostat fan position to "ON". The
blower should start.
2. Balance air flow at diffusers.
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 5 and
Table 6. During startup 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 ClimateMaster 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 ensure 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.
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 DXM2.5 control board as shown in Figure 24.
b. 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 Table 7.
c. 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.
d. Check the temperature of both entering and
leaving water. If temperature is within range,
proceed with the test. Verify correct water
flow by comparing unit pressure drop across
the heat exchanger to the data in Table 5.
w w w. c l i m a t e m a s t e r. c o m
TranquiliTy® 30 (SE) PrEMiEr TWO-STaGE SEriES– iOM
Unit Startup Procedure
Heat of rejection (HR) can be calculated and
compared to the performance data in the
unit's product catalog. 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.
e. 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].
f.
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 8. 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.
Verify correct water flow by comparing unit
pressure drop across the heat exchanger
versus the data in Table 7. Heat of extraction
(HE) can be calculated and compared to
the performance data in the unit's product
catalog. The formula for HE for systems with
water is as follows:
HE (kW) = TD x GPM x 500
where TD is the temperature difference
between the entering and leaving
water, and l/s is the flow rate in U.S. GPM,
C r e a t e d : M a r c h 6 , 2 0 2 4
Models:
SE
024-072
PA G E : 5 1
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Table of Contents
Troubleshooting
