Lead Color Function Troubleshooting
Red 35 VDCPositive power terminal Fan will only operate at max speed if disconnected
Blue 35 VDCNegative power terminal Fan will only operate at max speed if disconnected
Black Signal from controller Fan will only operate at max speed if disconnected
White Fan tach. 2 pulses/rev (freq x3 0=rpm)
8.1.3 Water pressure sensor
The water pressure sensor ensures that there is adequate pressure in the heating system for safe
operation. The pressure is displayed in PSI as the default. If the system pressure should drop below
8PSI the firing rate of the boiler is reduced. If the pressure drops to 4PSI or lower, the boiler will not
fire.
Check the operation of the sensor by isolating the boiler from its system piping, and close the system
fill valve, and then crack the pressure relief valve. The pressure displayed should reflect declining
pressure. If it remains “fixed”, drain the boiler and replace the sensor, or dislodge any blocking debris
from the sensor inlet channel and reinsert.
8.1.4 Safety and Ignition Module (SIM)
The SIM is a safety control, certified to conform to the UL 60730-5-5 and ANSI Z21.20 • CAN/CSA-
C22.2 No. 60730-2-5-14 standards.
The module controls the boiler’s combustion fan, gas valve, sensors, safety and ignition functions
including, and provides:
Direct spark ignition
Flame detection and current measurement
Flue gas temperature sensing
Supply water maximum temperature shutdown
Flue gas maximum temperature shutdown
Low water cut-off.
8.1.3 Water pressure sensor
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