76
ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Packaged Units
Rev.: 1/06/09B
Piping System Cleaning and Flushing
Cleaning and fl ushing the WLHP piping system is the
single most important step to insure proper start-up and
continued effi cient operation of the system.
Follow the instructions below to properly clean and fl ush
the system:
1.
Insure 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.
4.
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.
5. 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.
6. Set the boiler to raise the loop temperature to
approximately 86°F [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.
7. Refi ll the system and add trisodium phosphate in
a 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 temperature to 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.
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. Refi ll the system and bleed off all air.
9. 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.
10. 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.
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.
NOTE:
ClimateMaster 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.
ClimateMaster 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
To Next Page
Loading...
Need help?
General
