Interlock Tests; Remote Interlock Test; Delayed Interlock Test - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

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

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 (Figure 2-14) and
are labeled REMOTE INTL'K IN and DELAYED INTL'K IN. These circuits can shut down the
unit in the event that an interlock is opened. These interlocks are shipped from the factory
jumpered (closed). However, each of these interlocks 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.

5.6.1 Remote Interlock Test

Remote Interlock Test Instructions
1. Remove the cover from the I/O Box and locate the REMOTE INTL'K IN terminals.
2. Start the unit in the MANUAL mode and set the valve position between 25% and 30%.
3. 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.
4. The unit should shut down and display INTERLOCK OPEN.
5. Once the interlock connection is reconnected, the INTERLOCK OPEN message should
automatically clear and the unit should restart.

5.6.2 Delayed Interlock Test

Delayed Interlock Test Instructions
1. Remove the cover from the I/O Box and locate the DELAYED INTL'K IN terminals.
2. Start the unit in the MANUAL mode at a valve position between 25% and 30%.
3. If there is a jumper across the DELAYED INTL'K IN terminals, remove one side of the
jumper. If the interlock is connected to a proving switch of an external device, disconnect
one of the wires leading to the proving switch.
4. The unit should shut down and display a DELAYED INTERLOCK OPEN fault message.
The FAULT LED should be flashing.
5. Reconnect the wire or jumper removed in step 3 to restore the interlock.
6. Press the CLEAR button to reset the fault
7. The unit should start.
OMM-0123_E • GF-207 • 12/17/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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