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Adjusting the High Pressure Bypass Setting
Chillers with a positive displacement or turbine pump incorporate an automatic safety to maintain outlet pressure
below a valve-regulated pressure. This valve is adjustable and is located inside the Chiller housing.
WARNING: Service should only be performed by fully qualified personnel. Extreme caution is required as
hazards are present when servicing this equipment.
To access the high-pressure bypass valve, remove the access panel on the top of the unit (rear left).
The high-pressure bypass is adjusted as follows:
1. Set the low flow rate alarm value to zero (see Setting Operational Parameters, Minimum Flow Rate). This will
prevent the unit from activating the flow alarm while you are adjusting the maximum pressure setting.
2. Completely block the Chiller’s outlet flow. This should cause the outlet pressure to rise.
3. Set the Pressure/Flow Rate Display to read either PSI or kPa.
4. Rotate the handle on the pressure valve until the desired maximum
pressure setting is shown on the Pressure/Flow Rate Display.
5. Secure the Locknut.
6. Reset the flow alarm value to the previous setting.
7. Return the Pressure/Flow Rate Display to the previous setting.
8. Replace the access panel.
Enabling / Disabling the Local Lockout
This feature is used to prevent unauthorized or accidental changes to set point and other operational values.
When enabled, the values for the following functions can be displayed, but not changed:
• Temperature unit
• Temperature set point
• Ambient tracking offset
• Pressure / flow rate units
To enable the local lockout, press and hold the Select/Set Knob until LLO is displayed. Once enabled, LLO will
appear momentarily when the Select/Set Knob is pressed to display the set point.
To disable the local lockout, press and hold the Select/Set Knob until CAn appears momentarily as local lockout
status changes from enabled (LLO) to disabled.
IMPORTANT: The Local Lockout feature does not prevent set point changes entered via the RS232 interface
or 4-20 mA inputs.
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