Comfort-Aire HKV300A - Manual (Page 42)

Installation, Operation & Maintenance HKV SERIES Heat Controller, LLC
41
Note:
Heat Controller strongly recommends all piping connec-
tions, both internal and external to the unit, be pressure
tested for leakage by an appropriate method prior to any
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nections is limited. Heat Controller will not be responsible
or liable for damages from water leaks due to inadequate or
a lack of pressurized leak testing during installation.
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most important step to ensure proper start-up and continued
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system:
1. Verify electrical power to the unit is disconnected.
2. Install the system with the supply hose connected directly
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hose.
3. Open all air vents. Fill the system with the water. DO
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tem. Pressurize and check the system for leaks and repair
appropriately.
4. Verify all strainers are in place. (Heat Controller recom-
mends a strainer with a #20 stainless steel wire mesh.)
Start the pumps, and systematically check each vent to
ensure all air is bled from the system.
5. Verify make-up water is available. Adjust make-up water
appropriately to replace the air which was bled from the
system. Check and adjust the water/air level in the expan-
sion tank.
6. Set the boiler to raise the loop temperature to approxi-
mately 85°F [29°C]. Open the a drain at the lowest point in
the system. Adjust the make-up water replacement rate to
equal the rate of bleed.
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proportion of approximately one pound per 150 gallons
[1/2 kg per 750 L] of water (or other equivalent approved
cleaning agent). Reset the boiler to raise the loop tem-
perature to about 100°F [38°C]. Circulate the solution for
a minimum of 8 to 24 hours. At the end of this period, shut
off the circulating pump and drain the solution. Repeat
system cleaning if desired.
Piping System Cleaning & Flushing
CAUTION! To avoid possible damage to a plastic (PVC)
piping system, do not allow temperatures to exceed 110°F
[43°C].
CAUTION! 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 inhibit unit operation.
8. When the cleaning process is complete, remove the
short-circuited hoses. Reconnect the hoses to the proper
supply, and return the connections to each of the units.
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9. Test the system pH with litmus paper. The system water
should be slightly alkaline (pH 7.5-8.5). Add chemicals, as
appropriate, to maintain acidity levels.
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and bled, check the main system panels, safety cutouts
and alarms. Set the controls to properly maintain loop
temperatures.
BEFORE POWERING SYSTEM, please check
the following:
Unit Checkout
‰ Balancing/Shutoff Valves: Ensure all isolation valves are
open, water control valves wired and open or coax may
freeze and burst.
‰ Line Voltage and Wiring: Ensure Voltage is within an ac-
ceptable range for the unit and wiring and fuses/breakers
are properly sized. Low voltage wiring is complete.
‰ Unit Control Transformer: Ensure transformer has properly
selected control voltage tap. 208-230V units are factory
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‰ Entering Water and Air: Ensure entering water and air
temperatures are within operating limits of Table 6.
‰ Low Water Temperature Cutout: Verify low water tempera-
ture cut-out on CXM is properly set.
‰ Unit Fan: Manually rotate fans to assure free rotation and
ensure blower wheel is secured to motor shaft. Be sure
to remove any shipping supports if needed. DO NOT oil
motors upon start-up. Fan motors are pre-oiled at factory.
Verify unit fan speed selected is correct.
‰ Condensate Line: Condensate line is open and properly
pitched toward drain.
‰ Water Flow Balancing: Verify inlet and outlet water tem-
peratures are recorded for each heat pump upon startup.
This check can eliminate nuisance trip outs and high
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sible. To obtain maximum performance and avoid possible
condensate blow-off the coil should be cleaned using a
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proper and complete.
System Checkout
‰ System Water Temperature: Check water temperature for
proper range and also verify heating and cooling setpoints
for proper operation.
‰ System pH: System water pH is 7.5 - 8.5. Proper pH
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‰ System Flushing: Verify all hoses are connected end to
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exchanger and water valves etc. Water used in the system
must be potable quality initially and clean of dirt, piping
CAUTION!
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CAUTION!
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