CONTROLS – GAS VALVE SUF 120
The gas control valve on the SUF 120 has a built-in adjustable pressure regulator. The adjustment screw is accessed by removing the cap screw market regulator in the illustration.
Inlet gas pressure may be read at the inlet pressure tap only if the manual shut off valve (gas cock) is in the “ON” position. Leaving the knob in the “OFF” position will not allow the burner to fire and will generate a fault code on the UIM (Universal Interface Module).
CONTROLS – GAS VALVE SUF 150
The gas control valve on the SUF 150 has a built-in pressure regulator. The regulator may be adjusted by removing the cap screw marked “regulator” in the illustration.
Inlet gas pressure may be read at the inlet pressure tap only if the manual switch is set to the “ON” position.
32 | Servicing should only be performed by a Qualified Service Agent |
Commercial GAS High Efficiency Water Heaters
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Table of Contents
Introduction
Qualifications
Tools Required
GAS Pressure Specifications
General Information
Installation Quick Tips SUF 120 and 150 GAS Pressure
Adjustment Procedure GAS Pressure SUF 120 and 150 Models
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Installation Quick Tips SUF 199 and 250 GAS Pressure
Important Note
Installation Quick Tips SUF 300, 400, 500 GAS Pressure
Adjustment Procedure GAS Pressure SUF 300, 400
Installation Quick Tips SUF 300, 400
Installation Venting Category and Materials
Ultra Force Venting
Vent Length Table Equivalent Feet Meters 120 through
Venting Tables SUF 120
Vent Length Table Equivalent Feet Meters 300, 400
Concentric Venting
What about the PH Values of Condensate and Soda POP?
Vent Condensation
Can I Drain this Condensation to the Floor DRAIN?
What does the PH Scale MEAN?
Power Vent
Direct Vent
Vent Termination Direct Vent ALL Models
Direct Venting ALL Models
PVC Elbow
Control Overview
Status Icon Description
Set Point
Display Action
Adjusting Tank Temperature Operating SET Point Differential
Action
Display
Press Update to accept the change or Cancel to reset it
Changing the Display Units
Press Update to accept the change or Cancel to reject it
Example of a Fault Advanced Diagnostic Information
Example of a Warning
To get to the current fault information screen, press Menu
Access to the Current Fault or Warning
Press the Down button for more information
Fault Codes
Viewing Information About the Water Heater
Control Sequence Typical ALL Models
Typical Sequence
Control Sequence Flow Chart
Controls Central Control Board CCB
This is the back of the UIM
Controls GAS Valve SUF
Controls GAS Valve SUF 199
High Altitude Installation
GAS Orifice
Controls GAS Valve SUF 199
Controls GAS VALVE, Orifice Chart SUF 300/400
Orifice Chart SUF 300
Controls GAS VALVE, Orifice Chart SUF
Orifice Chart SUF
Blocked Outlet Proving Switch
Controls Pressure Switches ALL Models
Blower Proving Switch
Blocked Inlet Proving Switch
Controls Pressure Switches SUF 120 Through
Controls Pressure Switches SUF 300, 400
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Flame Sensor
HOT Surface Igniter / Flame Sensor / Control Timing
HOT Surface Igniter
Control Timing
Blower Speed Control SUF 199
Model High Speed Hz Low Speed Hz
Variable Frequency Drive SUF 400
Variable Frequency Drive Blower Speed and Pressure Readings
Voltage Frequency Speed Instructions VFD Model SUF
Wiring Diagram SUF 120
User Interface Modul
Wiring Diagram SUF 400
User Interface Module
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