T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
Vertical Stack
R e v. : 0 4 / 2 4 / 2 0 1 9
49
c l i m a t e m a s t e r. c o m
CAUTION!
To avoid possible damage to a plastic (PVC) piping
system, do not allow temperatures to exceed 110ºF (43ºC).
CAUTION!
Note: The manufacturer strongly recommends all
piping connections, both internal and external to the
unit, be pressure tested by an appropriate method
prior to any fi nishing 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.
The manufacturer 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.
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.
CAUTION!
CAUTION!
Unit and System Checkout
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.
BEFORE POWERING SYSTEM, please check the following:
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 hoses are connected end
to end when fl ushing to ensure 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.
Cooling tower/boiler: Check equipment for proper set
points and operation.
Standby pumps: Verify that the standby pump is
properly installed 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 provided for the
outdoor portion of the loop. Otherwise, operating
problems may occur.
System control center: Verify that the control center
and alarm panel have appropriate set points and are
operating as designed.
Miscellaneous: Note any questionable aspects of
the installation.
UNIT CHECKOUT
Balancing/shutoff valves: Ensure 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: Ensure that transformer has
the properly selected voltage tap. Commercial 208-
230V units are factory wired for 208V operation unless
specifi ed otherwise.
Entering water and air: Ensure that entering water and
air temperatures are within operating limits of Tables
12 & 13.
Low water temperature cutout: Verify that low water
temperature cut-out on the CXM/DXM2 control is
properly set.
Unit fan: Manually rotate fan to verify free rotation
and ensure 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.
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: Ensure that fi lter is clean and
accessible. Clean air coil of all manufacturing oils.
Unit controls: Verify that CXM or DXM2 fi eld selection
options are properly set.
