Comfort-Aire HWW120 - Manual (Page 25)

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Heat Controller, Inc. WATER-TO-WATER (HWW) SERIES Installation & Operation
Unit & System Checkout
UNIT CHECKOUT
q Balancing/Shutoff Valves: Ensure all isolation
valves are open, water control valves wired and
open or coax may freeze and burst.
q Line Voltage and Wiring: Ensure Voltage is within
an acceptable range for the unit and wiring and
fuses/breakers are properly sized. Low voltage
wiring is complete.
q Unit Control Transformer: Ensure transformer has
properly selected control voltage tap. 208-230V
units are factory wired for 208V operation unless
specified otherwise.
q Entering Water: Ensure entering water temperatures
are within operating limits of Table 6 [Page 25].
q Low Water Temperature Cutout: Verify low water
temperature cut-out on CXM is properly set.
q Water Flow Balancing: Verify inlet and outlet water
temperatures on both Load and source are record-
ed for each heat pump upon startup. This check can
eliminate nuisance trip outs and high velocity water
flows that can erode heat exchangers.
q Unit Controls: Verify CXM field selection options
are proper and complete.
SYSTEM CHECKOUT
q System Water Temperature: Check load and
source water temperature for proper range and
also verify heating and cooling setpoints for proper
operation.
BEFORE POWERING SYSTEM, please check the following:
q System pH: System water pH is 6 - 8.5. Proper pH
promotes longevity of hoses and fittings.
q System Flushing: Verify all hoses are connected
end to end when flushing to ensure debris bypass-
es unit heat exchanger and water valves etc. Water
used in the system must be potable quality initially
and clean of dirt, piping slag, and strong chemical
cleaning agents. Verify 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
setpoints and operation.
q Standby Pumps: Verify the standby pump is prop-
erly installed and in operating condition.
q System Controls: Verify system controls function
and operate in the proper sequence.
q Low Water Temperature Cutout: Verify low water
temperature cut-out controls are provided for the
outdoor portion of the loop or operating problems
will occur.
q System Control Center: Verify control center and
alarm panel for proper setpoints
and operation.
q Strainers: Verify 20 mesh (841 micron) [0.84mm]
strainers are installed in load and source water pip-
ing. Confirm maintenance schedule for strainers.
q Miscellaneous: Note any questionable aspects of
the installation.
� WARNING! �
Verify ALL water controls are open and allow water flow
prior to engaging the compressor. Freezing of the coax
or water lines can permanently damage the heat pump.
� WARNING! �
To avoid equipment damage, DO NOT leave system
filled in a building without heat during the winter unless
antifreeze is added to system water. Condenser coils
never fully drain by themselves and will freeze unless
winterized with antifreeze.
NOTE:
Heat Controller strongly recommends all piping
connections, both internal and external to the unit,
be pressure tested by an appropriate method prior to
any finishing of the interior space or before access
to all connections is limited. Test pressure may not
exceed the maximum allowable pressure for the
unit and all components within the water system.
Heat Controller will not be responsible or liable for
damages from water leaks due to inadequate or
lack of a pressurized leak test, or damages caused
by exceeding the maximum pressure rating during
installation.