Comfort-Aire HBH Series 6-10 Tons - Manual (Page 38)

IOM Manual HBH SERIES Heat Controller, Inc.
37
Unit Starting and Operating Conditions
CAUTION! Verify that ALL water control valves are open and
allow water flow prior to engaging the compressor. Freezing
of the coax or water lines can permanently damage the heat
pump.
CAUTION! To avoid equipment damage, DO NOT
leave system filled 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.
� CAUTION! �
� CAUTION! �
Unit and System Checkout
BEFORE POWERING SYSTEM, please check the
following:
UNIT CHECKOUT
q Balancing/shutoff valves: Insure that all isolation valves
are open and water control valves are wired.
q 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.
q Unit control transformer: Insure that transformer has
the properly selected voltage tap. Commercial 208-
230V units are factory wired for 208V operation unless
specified otherwise.
q Entering water and air: Insure that entering water and
air temperatures are within operating limits of Table 9.
q Low water temperature cutout: Verify that low water
temperature cut-out on the CXM control is properly set.
q 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.
q Condensate line: Verify that condensate line is open
and properly pitched toward drain.
q Water flow balancing: Record inlet and outlet water
temperatures for each heat pump upon startup. This
check can eliminate nuisance trip outs and high velocity
water flow that could erode heat exchangers.
q Unit air coil and filters: Insure that filter is clean and
accessible. Clean air coil of all manufacturing oils.
q Unit controls: Verify that CXM field selection options are
properly set.
SYSTEM CHECKOUT
q System water temperature: Check water temperature
for proper range and also verify heating and cooling set
points for proper operation.
q 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 fittings
(see table 3).
q System flushing: Verify that all hoses are connected
end to end when flushing to insure that debris bypasses
the unit heat exchanger, water valves and other
components. Water used in the system must be potable
quality initially and clean of dirt, piping slag, and strong
chemical cleaning agents. Verify that all air is purged
from the system. Air in the system can cause poor
operation or system corrosion.
q Cooling tower/boiler: Check equipment for proper set
points and operation.
q Standby pumps: Verify that the standby pump is
properly installed and in operating condition.
q System controls: Verify that system controls function
and operate in the proper sequence.
q Low water temperature cutout: Verify that low water
temperature cut-out controls are provided for the
outdoor portion of the loop. Otherwise, operating
problems may occur.
q System control center: Verify that the control center
and alarm panel have appropriate set points and are
operating as designed.
q Miscellaneous: Note any questionable aspects of
the installation.
CAUTION! Do not use PVC piping. Temperatures will
exceed 113°F (45°C).
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CAUTION!
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CAUTION!
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CAUTION!
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