Technical data

Page 10
8. System Controls: To ensure no catastrophic system
failures occur, verify system controls are
functioning and the sequencing is correct.
9. Freeze Protection for Water System: Verify
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 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 the
unit filter is clean.
12. Unit Fans: Manually rotate fans to assure free
rotation. Ensure fans are properly secured to the fan
shaft. DO NOT oil 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.
When the installation is complete and the system is cleaned and flushed, follow the System Checkout procedure outlined below:
1. Voltage: Ensure voltage is within the utilization
range specifications of the unit compressor and fan
motor.
2. System Water Temperature: Ensure 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 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
chemical cleaning agents.
5. Closed-Type Cooling Tower (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 the standby pump is
properly installed and in operating condition.
SYSTEM CHECKOUT
7. Refill the system and add trisodium phosphate in a
proportion of approximately one pound per 150
gallons of water. Reset the boiler to raise the loop
temperature to about 100°F.
To avoid possible damage to piping systems
constructed of plastic piping, DO NOT allow loop
temperature to exceed 110°F.
Circulate the solution for a minimum of eight to 24
hours. At the end of this period, shut off the
circulating pump and drain the solution. Repeat
system cleaning, if desired.
8. When the cleaning process is complete, remove the
short-circuited hoses. Re-connect the hoses to the
proper supply, and return the connections to each of the
Horizontal and Vertical units. Refill the system and
bleed off all air.
9. Test the system pH with litmus paper. The system
water should be slightly alkaline (pH 7.5 to 8.5). Add
chemicals, as appropriate, to maintain acidity levels.
DO NOT use “Stop-Leak” or any similar chemical agent
in this system. Addition of these chemicals to the loop
water will foul the system and will inhibit unit operation.
10. When the system is successfully cleaned, flushed,
refilled and bled, check the main system panels, safety
cutouts and alarms. Set the controls to properly
maintain loop temperatures.
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▲ CAUTION
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▲ CAUTION
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▲ CAUTION
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