CLIMATEMASTER WATER-SOURCE HEAT PUMPS
40
ClimateMaster Water-Source Heat Pumps
Tranquility 16 (TC) Series
Rev.: 25 July, 2017
Piping System Cleaning and Flushing - Cleaning and
fl ushing the WLHP piping system is the single most
important step to ensure proper start-up and continued
effi cient operation of the system.
Follow the instructions below to properly clean and
fl ush the system:
1. Ensure that electrical power to the unit is
disconnected.
2. Install the system with the supply hose connected
directly to the return riser valve. Use a single length of
fl exible hose.
3. Open all air vents. Fill the system with water. DO
NOT allow system to overfl ow. Bleed all air from the
system. Pressurize and check the
system for leaks and repair as appropriate. ClimaDry®-
equipped units have a manual air
bleed valve at the top of the reheat coil. This valve
must be used to bleed the air from the reheat coil after
fi lling the system, for ClimaDry
®
to operate
properly.
1. Verify that all strainers are in place (ClimateMaster
recommends a strainer with a #20 stainless steel
wire mesh). Start the pumps, and systematically
check each vent to ensure that all air is bled from
the system.
2. Verify that make-up water is available. Adjust make-
up water as required to replace the air which was
bled from the system. Check and adjust the water/
air level in the expansion tank.
3. Set the boiler to raise the loop temperature to
approximately 30°C. Open a drain at the lowest
point in the system. Adjust the make-up water
replacement rate to equal the rate of bleed.
4. Refi ll the system and add trisodium phosphate
in a proportion of approximately 1/2 kg per
750 l of water (or other equivalent approved
cleaning agent). Reset the boiler to raise the loop
temperature to 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.
5. 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. Refi ll the system and bleed off all
air.
6. Test the system pH with litmus paper. The system
water should be in the range of pH 6.0 - 8.5 (see
table 3). Add chemicals, as appropriate to maintain
neutral pH levels.
7. When the system is successfully cleaned, fl ushed,
refi lled and bled, check the main system panels,
safety cutouts and alarms. Set the controls to
properly maintain loop temperatures.
8.
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.
Piping System Cleaning and Flushing
DO NOT use “Stop Leak” or similar chemical agent
in this system. Addition of chemicals of this type
to the loop water will foul the heat exchanger and
inhibit unit operation.
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