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Ultra Classic (VT) Series

Page 27

Start up Procedure

When the disconnect switch is closed, high

voltage is present in some areas of the electrical

panel. Exercise caution when working with

energized equipment.

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 DB. For Start-up check,
loop water temperature entering the heat pumps
should be between 40°F and 90°F.

5. Two factors determine the operating limits of a

ClimateMaster UltraClassic 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 coolest 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 24. 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 13.

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 12. Check the difference in

temperature of supply and return water
temperature, usually referred to as Delta-T Water.

If Delta-T Water is outside the range shown in
table 12, check cooling refrigerant pressure in
table 14. Verify correct water flow by comparing
unit pressure drop across the heat exchanger
versus the data in Table 12. Heat of rejection can
be calculated and compared to specification
catalog.

f. Check air temperature drop across the coil when
compressor is operating. Air temperature should
drop between 15°F and 25°F.

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 12. If temperature
is within range, proceed with test. If temperature
is outside operating range, check heating

refrigerant pressures in Table 14.

e. Check air temperature rise across the coil when
compressor is operating. Air temperature should rise
between 20°F and 30°F. 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. 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
CLIMATEMASTER.

Note:

If performance during any mode appears

abnormal, refer to the troubleshooting section. To

obtain maximum performance the air coil should be

cleaned before start-up. A 10% solution of dishwasher

detergent and water is recommended.

WARNING

UNIT START UP