Interlock Tests; Remote Interlock Test - Watts AERCO Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 5 – SAFETY DEVICE TESTING
Water Temperature Fault Test Instructions
5. The unit should start once the adjustable Temperature Limit switch setting is above the
actual outlet water temperature.
Figure 5-5a: Temperature Limit Switch Location – BMK1500-3000 Shown

5.6 INTERLOCK TESTS

The unit is equipped with two interlock circuits called the Remote Interlock and Delayed
Interlock. Terminal connections for these circuits are located in the I/O Box (see Section 2.11.1:
I/O Board Connections in the Benchmark 750-6000 with Edge [i]: Install-Startup Manual (OMM-
0144, GF-217) and are labeled REMOTE INTL'K IN and DELAYED INTL'K IN.
These circuits can shut down the unit in the event an interlock is opened. Both interlocks are
shipped from the factory jumpered (closed). However, they may be utilized in the field as a
remote stop and start, an emergency cut-off, or to prove that a device such as a pump, gas
booster or louver is operational.

Remote Interlock Test

5.6.1
Remote Interlock Test Instructions
1. Remove the cover from the I/O Box and locate the REMOTE INTL'K IN terminals.
2. On the Controller, go to:
Manual Run control.
3. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
4. If there is a jumper across the REMOTE INTL'K IN terminals, remove one side of the
jumper. If the interlock is being controlled by an external device, either open the interlock
via the external device or disconnect one of the wires leading to the external device.
5. The unit should shut down and the Controller should display Interlock Open.
6. Once the interlock connection is reconnected, the Interlock Open message should
automatically clear and the unit should restart.
OMM-0145_A99 • GF-218 •
Main Menu → Diagnostics → Manual
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
OVER
TEMPERATURE
LIMIT DIGITAL
CONTROLLER
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
MANUAL
SWITCH
RESET
BUTTON
MANUAL
TEMPERATURE
LIMIT SWITCH
Mode, then enable the
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