Sequence of Operation | Gas-Fired Products 75, N7/L7, 100, 40, 150

19.0) SEQUENCE OF OPERATION

The chart below shows the sequence of operation for the normal operating cycle of the PTS/PTU when connected to a permanent 120V power supply and the heater is turned on and off by a remote 24V thermostat. (Electrical connection diagram B).

Thermostat low fire

Thermostat high fire

Blower

Air switch

Red power light

Ignition

Gas valve low fire

Gas valve high fire

Flame sensing

Amber valve light - low fire Amber valve light - high fire

Call for heat, Thermostat on 15 secs pre-purge

15 secs trial for ignition

Normal high fire operation flame sensing

Thermostat - high fire off Thermostat (turn off)

30 secs post-purge Heater OFF

T0

T1

T2

T3

Function ON

T4	T5	T6	T7	T8
Function OFF

If the flame is not sensed during sequence T3 then the burner will automatically begin re-ignition sequence T2. The ignition sequence will be repeated three times with a 60 second inter-purge. If the flame is not re-established the heater will go to lockout.

	Form #43343530
–40–	JJuly 08

Image 41

Gas-Fired Products N7/L7, 100, 40, 150, 175, 200 manual Sequence of Operation

Contents

Installation and Operation Instructions Table of Contents Installer Responsibility SafetyInstallation Requirements General Information High Altitude For Canada only Minimum Clearances to Combustibles Minimum Clearances to Combustibles Packing List Specifications Natural GAS Burner Package Numbers PTU 40-200 Body Package Descriptions Reflector, 4’ 11 ½’ End Reflector Accessory Package Accessories Exhaust Hood Package Emitter Length Body Length Model Typical Layouts PTU / PTS Series Poisonous GAS and Soot Hazard Typical Assembly Layout PTS Series Dimensions PTU Series Joining of Tube Sections Heater Assembly Typical Assembly Overview PTU 40FT Shown Suspension Hazard Typical Suspension Methods CUT Hazard Assembly of Tube Sections MIN 8’ MAX 10’ Between Hangers Assembly of Extension Section Inserting Turbulators Ft. Turbulator Sections Adding Reflectors Adding Optional Corner Reflector PTS only Adding Optional 90º Elbow PTS only Adding Optional U-BEND Reflector PTU only Adding 180U-Bend PTU only Attaching Burner BOX Assembly Instructions Connecting the Tiss System End View Angle Mounted Heaters only Do not USE AN Open Flame of ANY Kind to Test for Leaks GAS Connections and Regulations KEY Dimensions and Components of the GAS Connections Manifold PRESSURE- Combination GAS Valve is Factory SET Instructions for Pressure Test Gauge ConnectionSupply Pressure GAS Control Valve Electrical Connections TH/W Ignition Module Terminal Designations 24VAC/RPS/W GND LOW Voltage 24V Thermostat Connections Multiple Heaters LOW Voltage 24V Thermostat Connections Single Heater Single Heater Venting Vertical Through the Roof Venting Single Heater Venting Horizontal Through Sidewall #10 Self-Drill Vent Pipe Screws Indirect Venting Unvented Heaters Common Vent Diameter Direct Outside AIR for Combustion AIR for Combustion Side View Lighting and Shutdown Instructions Sequence of Operation Burner Component Locations Electric Shock & Explosion Hazard Cleaning and Maintenance 22.0 Troubleshooting Guide Form #43343530 JJuly Replace air switch Restart Troubleshooting Yes Removal of Main Burner and Electrodes Replacing Parts AIR Switch Pressure Check Removal of GAS Valve and Manifold Assembly To Check Flame Sensor Circuit Ignition Module DiagnosticsIgnition System Checks Replacement Parts Guide Burner BOX Installation Data Labels/Manual 22c Description Body Components