ClimateMaster DC Series Installation Manual download pdf (Page 36)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

CAUTION! Verify that ALL water control valves are open

and allow water ﬂ ow prior to engaging the compressor.

Freezing of the coax or water lines can permanently

damage the heat pump.

NOTICE! Failure to remove shipping brackets from spring-

mounted compressors will cause excessive noise, and could

cause component failure due to added vibration.

CAUTION! To avoid equipment damage, DO NOT

leave system ﬁ lled in a building without heat during the

winter unless antifreeze is added to the water loop. Heat

exchangers never fully drain by themselves and will freeze

unless winterized with antifreeze.

Unit Starting and Operating Conditions

Unit and System Checkout

BEFORE POWERING SYSTEM, please check the following:

UNIT CHECKOUT

 Balancing/shutoff valves: Insure that all isolation valves

are open and water control valves are wired.

 Line voltage and wiring: Verify that voltage is within

an acceptable range for the unit and wiring and fuses/

breakers are properly sized. Verify that low voltage wiring

is complete.

 Unit control transformer: Insure that transformer has the

properly selected voltage tap. Residential 208-230V units

are factory wired for 230V operation unless speciﬁ ed

otherwise.

 Loop/water piping is complete and purged of air. Water/

piping is clean.

 Antifreeze has been added if necessary.

 Entering water and air: Insure that entering water and air

temperatures are within operating limits of Table 8.

 Low water temperature cutout: Verify that low water

temperature cut-out on the CXM/DXM control is properly

set.

 Unit fan: Manually rotate fan to verify free rotation and

insure that blower wheel is secured to the motor shaft.

Be sure to remove any shipping supports if needed.

DO NOT oil motors upon start-up. Fan motors are pre-

oiled at the factory. Check unit fan speed selection and

compare to design requirements.

 Condensate line: Verify that condensate line is open and

properly pitched toward drain.

 HWG pump is disconnected unless piping is completed

and air has been purged from the system.

 Water ﬂ ow balancing: Record inlet and outlet water

temperatures for each heat pump upon startup. This

check can eliminate nuisance trip outs and high velocity

water ﬂ ow that could erode heat exchangers.

 Unit air coil and ﬁ lters: Insure that ﬁ lter is clean and

accessible. Clean air coil of all manufacturing oils.

 Unit controls: Verify that CXM ﬁ eld selection options are

properly set. Low voltage wiring is complete.

 Blower speed is set.

 Service/access panels are in place.

SYSTEM CHECKOUT

 System water temperature: Check water temperature

for proper range and also verify heating and cooling set

points for proper operation.

 System pH: Check and adjust water pH if necessary to

maintain a level between 6 and 8.5. Proper pH promotes

longevity of hoses and ﬁ ttings (see Table 3).

 System ﬂ ushing: Verify that all air is purged from the

system. Air in the system can cause poor operation or

system corrosion. Water used in the system must be

potable quality initially and clean of dirt, piping slag,

and strong chemical cleaning agents. Some antifreeze

solutions may require distilled water.

 Flow Controller pump(s): Verify that the pump(s) is wired

and in operating condition.

 System controls: Verify that system controls function and

operate in the proper sequence.

 Low water temperature cutout: Verify that low water

temperature cut-out controls are set properly

(FP1 - JW3).

 Miscellaneous: Note any questionable aspects of

the installation.

Unit Start-up Procedure

1. Turn the thermostat fan position to “ON.” Blower

should start.

2. Balance air ﬂ ow at registers.

3. Adjust all valves to their full open position. Turn on the

line power to all heat pump units.

4. Room temperature should be within the minimum-

maximum ranges of Table 8. During start-up checks,

loop water temperature entering the heat pump should

be between 30°F [-1°C] and 95°F [35°C].

Two factors determine the operating limits of water

source 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 ﬁ ve minute time delay in the

control circuit that can be eliminated on the CXM/

DXM control board as shown below in Figure 29. See

controls description for details.

 CAUTION! 

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ClimateMaster DC Series Installation Manual Page 36

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