Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 5 – SAFETY DEVICE TESTING
Page
70
of
206
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0078_0L
PRI: 11/25/2014
Phone: 800-526-0288
GF-128
NOTES
The manual (non-adjustable) Over Temp Limit switch is
calibrated to trip if the discharge water exceeds 190° F. Testing
of this device must be done by authorized personnel only.
Figure 5-2. Temperature Limit Switch Setting
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 2-12) 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.
5.6.1 Remote Interlock
Remote Interlock
1.
Remove the cover from the I/O Box and locate the REMOTE INTL’K IN terminals (see
Figure 2-12).
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.
MANUAL RESET (NON-
ADJUSTABLE)
OVER-
TEMPERATURE LIMIT
SWITCH
AUTOMATIC RESET
(ADJUSTABLE)
TEMPERATURE OVER-
LIMIT SWITCH
