Water Temperature Fault Test - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 5: SAFETY DEVICE TESTING

5.5 WATER TEMPERATURE FAULT TEST

A high water temperature fault is simulated by adjusting the automatic Over-Temperature
switch. This switch is accessible from the front of the unit as shown in Figure 5-4, below.
Water Temperature Fault Test Instructions
1. Start the unit in the normal operating mode. Allow the unit to stabilize at its setpoint.
2. Lower the adjustable Over-Temperature switch setting to match the displayed OUTLET
TEMPERATURE.
3. Once the adjustable Over-Temperature switch setting is approximately at, or just below,
the actual outlet water temperature, the unit should shut down. The FAULT indicator
should start flashing and a HIGH WATER TEMP SWITCH OPEN fault message should be
displayed. It should not be possible to restart the unit until the water temperature is below
the new setpoint.
4. Reset the adjustable Over-Temperature switch to its original setting.
5. The unit should start once the adjustable Temperature Limit switch setting is above the
actual outlet water temperature.
Figure 5-4: Temperature Limit Switch Location
OMM-0123_E • GF-207 • 12/17/2019
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OVER
TEMPERATURE
LIMIT DIGITAL
CONTROLLER
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
MANUAL
SWITCH
RESET
BUTTON
MANUAL TEMPERATURE
LIMIT SWITCH
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