Chapter 5. Safety Device Testing; Introduction; Low Gas Pressure Fault Test - Watts Aerco Innovation 800 User Manual

Innovation Hot Water Hot Water Boiler User Manual

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.
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.
Electrical voltages in this system may include 220, 110 and 24
volts AC.
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:
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.
OMM-0120_0A
GF-128-I
CHAPTER 5 – SAFETY DEVICE TESTING
NOTES
--WARNING! -
Power must be removed prior to performing wire
Low Gas Pressure Fault Test
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
Page 61 of 174
11/15/2016