Bypass Pressure Relief Valve
Purpose: Some chiller designs use a turbine pump. These designs also include a bypass pressure
relief valve. The valve limits pressure by opening to bypass flow internal to the chiller.
The procedure below can be used to adjust the bypass pressure relief valve setting.
1. Remove the right side panel of the chiller.
2. Identify the bypass relief valve. An example picture is below.
3. On the bypass relief valve, use a wrench to loosen the nut at the base of the adjustment post.
4. Completely restrict the external cooling circuit, for example by closing a ball valve at the
chiller’s supply connection or kinking a hose. Look at the pressure reading on the controller or
gauge.
o The pressure that results is the bypass relief valve setting
o This is the highest pressure the external system will experience if a restriction
developed in the cooling circuit
5. On the bypass relief valve, use a flat head screwdriver to rotate the adjustment post.
o Rotate clockwise to increase pressure
o Rotate counterclockwise to decrease pressure
6. After a small adjustment, remove the restriction from step 4 to see how much flow and
pressure results to the application.
7. If more adjustment is required, repeat steps 4 through 6 until the required flow/pressure is
available to the application.
8. Use a wrench to tighten the nut at the base of the adjustment post and replace the chiller’s
side panel.
Bypass pressure relief valve
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