Innovation Hot Water Hot Water Boiler User Manual
- INTERNATIONAL
CHAPTER 5 – SAFETY DEVICE TESTING
OMM-0120_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
61
of
174
GF-128-I
Phone: 800-526-0288
11/15/2016
CHAPTER 5. SAFETY DEVICE TESTING
5.1 INTRODUCTION
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.
NOTES
MANUAL and AUTO modes of operation are required to perform the
following tests. For a complete explanation of these modes, see Chapter 3.
It will also 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 220, 110 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
To simulate a low gas pressure fault, refer to Figure 5-1 and proceed as follows:
Low Gas Pressure Fault Test
1.
Ensure that the leak detection ball valve on the
Low Gas Pressure
switch is closed.
2.
Remove the 1/4“ plug from the ball valve at the
Low Gas Pressure
switch shown in the
lower portion of Figure 5-1.
3.
Install a
0 – 16“ W.C. (0 – 4.0 kPa)
manometer (or a W.C. gauge) where the 1/4" plug
was removed.
4.
Slowly open the ball valve near the
Low Gas Pressure
switch.
5.
Place the unit in Manual mode and adjust the air/fuel valve position (% open) between 25
and 30%.
6.
While the unit is firing, slowly close the external manual gas shut-off valve.
7.
The unit should shut down and display a
LOW GAS PRESSURE
fault message at
approximately 2.6” W.C. (648 Pa). The
FAULT
indicator should also start flashing.
8.
Fully open the external manual gas shut-off valve and press the
CLEAR
button on the
Control Box.
9.
The fault message should clear, the
FAULT
indicator go off, and the unit should restart.
10.
Upon test completion, close the ball valve and remove the manometer. Replace the 1/4“
plug removed in step 1.