Once the system is filled, any air left in the system must be eliminated. Briefly open each
bleed valve at the air handler(s) and allow trapped air to escape. This will eliminate much of
the air left in the system. A field installed air bleed port at the highest point in the piping
is recommended to speed up the air elimination process.
Start the pump and continue bleeding air from the system. Set the chilled liquid solution
control up to 100°F which will ensure that only the pump will run at this point. Should the
pump stop at any time during this process, it is an indication that the flow switch had air move
across it allowing the circuit to be interrupted. Continue to bleed air out of the system at the
highest points before resetting the pump bypass timer. Open and close the power supply
switch to the chiller to restart the pump. Continue bleeding air with the pump operating. You
may have to start and re-start the pump several times to complete air removal.
If you continue having air entrapment issues, it will be necessary to install a
micro bubble remover device.
ALL PIPING SYSTEMS SHOULD HAVE A MINIMUM OF 10%
PROPYLENE GLYCOL IN THE SYSTEM EVEN IN CLIMATES WITH
NON-FREEZING AMBIENT TEMPERATURES.
Liquid solution control valves (solenoid or motorized valves), should be
selected for low pressure drop.
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