Chapter 5
Innovation Series Water Heaters
GF-128
Safety Device Testing
USER MANUAL
OMM-0079_0B
07/21/11 AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
Page
49
of
200
CHAPTER 5. SAFETY DEVICE TESTING
5.1
TESTING OF SAFETY DEVICES
Periodic safety device testing is required to ensure that the control system and safety devices are
operating properly. The heater control system comprehensively monitors all combustion-related safety
devices before, during and after the start sequence. The following tests check to ensure that the system
is operating as designed.
Operating controls and safety devices should be tested on a regular basis or following service or
replacement. All testing must conform to local codes such as ASME CSD-1.
NOTE
MANUAL and AUTO modes of operation are required to perform the following tests. For
a complete explanation of these modes, see Chapter 3.
NOTE
It will be necessary to remove the front door and side panels from the unit to perform the
following tests.
WARNING
ELECTRICAL VOLTAGES IN THIS SYSTEM MAY INCLUDE 120 AND 24
VOLTS AC. POWER MUST BE REMOVED PRIOR TO PERFORMING WIRE
REMOVAL OR OTHER TEST PROCEDURES THAT CAN RESULT IN
ELECTRICAL SHOCK.
5.2
LOW GAS PRESSURE FAULT TEST
Refer to Figure 5-1 and ensure that the leak detection ball valve located at the high gas pressure switch is
closed.
1. Remove the 1/8“ plug from the ball valve at the low gas pressure switch shown in the lower portion of
Figure 5-1.
2. Install a 0 – 16“ W.C. manometer or a W.C. gauge where the 1/8" plug was removed.
3. Slowly open the ball valve near the low gas pressure switch.
4. Place the unit in Manual Mode and adjust the air/fuel valve position (% open) between 25 and 30%.
5. While the unit is firing, slowly close the external manual gas shut-off valve.
6. The unit should shut down and display a
LOW GAS PRESSURE
fault message at approximately 2.6”
W.C. The
FAULT
indicator should also start flashing.
7. Fully open the external manual gas shut-off valve and press the
CLEAR
button on the Control Box.
8. The fault message should clear and the
FAULT
indicator should go off. The unit should restart.
9. Upon test completion, close the ball valve and remove the manometer. Replace the 1/8“ plug
removed in step 1.
