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9. Freeze Protection for Water System: Verify
that freeze protection is provided for the outdoor
portion of the loop water system. Inadequate
freeze protection can cause system operating
problems.
To avoid equipment damage, DO NOT leave system
filled in a building without heat during the winter
unless anti-freeze is added to system water.
Condenser coils never fully drain by themselves and
will freeze unless winterized with anti-freeze.
10. System Water Loop: Verify that all air is bled
from the system. Air in the system impedes unit
operation and causes corrosion in the system
piping.
11. Unit Filters: To avoid system damage, ensure
that the unit filter is clean.
12. Unit Fans: Manually rotate fans to assure free
rotation. Ensure that fans are properly secured to
the fan shaft. Do not lubricate fan motors on
start-up since they are lubricated at the factory.
13. System Control Center: To ensure control of
the temperature set-points for operation of the
system’s heat rejector and boiler, examine the
system control and alarm panel for proper
installation and operation.
14. Miscellaneous: Note any questionable aspects of
the installation.
1. Voltage: Ensure that voltage is within the
utilization range specifications of the unit
compressor and fan motor.
2. System Water Temperature: Ensure that it is
within an acceptable range to facilitate start-up.
(When conducting this check, also verify proper
heating and cooling set points.)
3. System Water pH: Verify system water acidity.
(pH = 7.5 or 8.5) Proper pH promotes the
longevity of hoses and heat exchangers.
4. System Flushing: Properly clean and flush
system periodically. Ensure that all supply and
return hoses are connected end-to-end to facilitate
system flushing and prevent fouling of the heat
exchanger by system water.
Water used in the system must be of potable
quality and clean of dirt, piping slag, and chemi-
cal cleaning agents.
5. Closed-Type Cooling Tower or Open Tower
with Heat Exchanger: Check equipment for
proper temperature set points and operation.
6. Balanced Water Flow Rate to Heat Pump:
Verify the inlet and outlet water temperatures are
recorded as each heat pump unit is started. This
check will eliminate nuisance unit trip-outs
resulting from water velocities which are either
too low or too high; it can also prevent the
occurrence of erosive water flow rates.
7. Standby Pump: Verify that the standby pump is
properly installed and in operating condition.
8. System Controls: To ensure that no catastrophic
system failures occur, verify that system controls
are functioning and that the sequencing is correct.
SYSTEM CHECKOUT
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When the installation is complete and the system is cleaned and flushed, follow the System Check-
out procedure outlined below:
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CAUTION
