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Chart 1: Natural Gas and LP
Firing Rate Burner
Model
Length
of Flame
Tube
Min
BTU/H
Max
BTU/H
Primary
Electric
Input
Secondary
Electric
Input
Total
Watts
Total
Amps
Gas
Conn.
SU-2A
4 ¼”
50,000
250,000
120 Volt
60 Hz
1 Ph
24 Volts
150
Max
3 or
less
½”
- Control System: Fenwal Model 2466H936-111 with 15 Second Pre-Purge and 60 Second Post-Purge OR
Honeywell S89F with 34 second Pre-Purge.
- The system uses a remote ignition system with a separate Ignition Transformer.
- Gas Valve: VR8205A 2008 or VR 8305 P with step opening (special applications).
BURNER DESCRIPTION
The SU-2A Gas Burner is a fully automatic, flame retention burner and is suitable for
combustion of natural gas or LP. Changing orifices alters the firing rate. The combustion air can
be adjusted for proper O
2
or CO
2
by the dial located on top of the burner housing, which allows the
air to flow more or flow less within the burner.
Two electrodes act as a sparker and a flame rod (See Fig. 1). Flame rectification by this
flame rod monitors the continued presence of the burner flame. With three trials for ignition
consistency (with Fenwal control), trouble free, safe operation is achieved.
Warning: Should overheating occur, 1) shut off the manual gas shut off valve to
control the appliance; 2) DO NOT shut off the control switch to the pump or blower
This power gas burner is designed to convert oil and/or coal fired boilers and furnaces to a
gas-burning appliance. The conversion must conform to local codes. In the absence of such
codes, the American National Standard for the Installations of gas conversion burners, ANSI
Z21.17-1984, Z21.8A-1990 and the National Fuel Gas Code ANSI 223.1-1992 or current
standards should be applied.
Fig. 1 Electrode and Flame Sensor Dimensions