8.2.5 Gas pressure switches
The high and low gas pressure switches help protect the boiler from gas pressures outside of the
acceptable range of operation. To view the location of the pressure switches on the EX series
boilers, see Figure 42 or Figure 43 .
The low gas pressure switch is pre-calibrated, and will trip when the inlet gas pressure falls
below 3.5" w.c.
The high gas pressure switch is pre-calibrated and will trip when the inlet gas pressure rises
above 15" w.c.
You must reset the low gas pressure switch after the gas to the boiler is connected and turned on.
To “reset” either the low or high gas pressure switch, press on the clear plastic cover above the Red
button.
Warning
Do not attempt to adjust the High or Low pressure switch.
If either the high or low gas pressure switch trips, the boiler controller will show a Red bar at the
bottom of the screen and indicate “Low/High Gas Pressure”.
8.2.6 Safety and Ignition Module (SIM)
The SIM is a safety control used in the EX series of boilers. It is certified to conform to the UL
60730-5-5 and ANSI Z21.20-2014 • CAN/CSA-C22.2 No. 60730-2-5-14 standards.
The module controls the boiler’s gas valve, including:
Direct spark automatic ignition
Flame detection and current measurement
Supply water temperature sensing
Flue gas temperature sensing
Supply water maximum temperature shutdown
Flue gas maximum temperature shutdown
Low water cut-off.
The SIM continuously communicates with the boiler’s main controller reporting sensor readings
and status. The sensor readings and error status, if any are displayed on the boiler controller’s
screen.
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