AERCO BMK 2000DF - Manual (Page 82)

Benchmark 1500DF - 2000DF Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page 82 of 196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0098_0A
04/01/2014 Ph.: 800-526-0288 GF-144
9.
Figure 6-2: Temperature Limit Switch Location
6.6 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 2-12) 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.
6.6.1 Remote Interlock Test
Remote Interlock Test
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.
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
MANUAL
SWITCH
RESET
BUTTON
OVER
TEMPERATURE
LIMIT DIGITAL
CONTROLLER
MANUAL
TEMPERATURE
LIMIT SWITCH
FUEL
SELECTION
SWITCH