Lennox Fhm 170 Installation, Operating And Maintenance Guide

HEATING : GAS BURNER
FLEXYII_WSHP-IOM-1307-E - 66 -
GAS BURNER FIRE-UP SEQUENCE
Operation from control thermostat GAZ
=Closed
Supply Thermostat
Limit?
(Auto Reset)
Fault on CLIMATIC
Extraction Fan ON
AIR Pressure Switch ON
Backfire Thermostat
ON?
Gas Control
Valve Closes
BURNER
STOPS
Gas Low Pressure
Gas Ignition Control Block Signal
Normal Operation
6 Minutes Delay
Pre-Ventilation 30 seconds
Fire-up Electrode 4s
Gas Valve Open
Ionisation 1second
after the end of
Gas Valve remains Open
Gas Control Valve
Closes
BURNER STOPS
Fault on Gas
Control Block
Signal from Ionisation
probe still ON?
Air Press Switch ON or
Backfire Thermostat?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES

Lennox Fhm 170 Specifications

General

Brand	Lennox
Model	Fhm 170
Category	Heat Pump
Language	English