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Model SG - Specification Data
(1)
STANDARD UL EQUIPMENT
AND IMPORTANT OPTIONS
Motor, Fan and Air Inlet Control
Air Flow Switch
Burner Mounted Control Panel,
Switch and Indicator Lights
Flame Safety Control
Ultra Violet Scanner
Motor Controller (single phase
voltage)
Direct Spark Gas Ignition
Direct Spark Gas Ignition
Transformer
1. The configuration of each unit will vary with specific requirements such as input rating, electrical specification and special
agency approval codes. The above chart shows items standard to a basic burner plus a few options that may be added.
Model SG – Sizing & Application Data
Model
Maximum
Burner Firing
Number
Furnace
Capability Range
Pressure
Gas scfh
SG6-03
.25
400 / 1000
SG8-03
.25
600 / 1500
SG8-05
.25
800 / 2100
3. Larger motors may be required for single phase or 208 volts.
The above maximum ratings are based on 0 furnace pressure, an altitude of 1000 feet, 90 o F air temperature and 60 HZ
electrical supply. Use the following corrections for higher temperatures and altitude. Capacity decreases by 17% for 50 Hertz.
Capacity decreases by 4% for each 1000 feet above 1000 foot altitude.
Capacity decreases by 6% for each 1 inch of furnace pressure.
Capacity decreases by 2% for each 10
Gas input ratings based on 1000 BTU/cu ft. and 0.64 specific gravity. Sizes and pressure will vary with gas.
Essential Ordering Information and Data:
Power Supply - Confirm 120-60-1 for control circuit and electrical supply for burner motor(s) (voltage, frequency and phase).
Describe Boiler or Heater to be Fired - Including the manufacturer, model number, furnace pressure and furnace size.
Firing Rate - Define firing rates in MBH for gas.
Flame Safety Control Preferred - Honeywell or Fireye controls.
Gas Train Components Preferred - ASCO or Honeywell
Control System - ON-OFF, Low Fire Start, Low-High-Low, Modulation
SG Manual
(400 - 2500 MBH Input)
Fuel
STANDARD UL EQUIPMENT
AND IMPORTANT OPTIONS
X
Main Manual Shutoff Valve
X
Main Safety Shutoff Valve
X
Second Safety Shutoff Valve
X
Main Gas Regulator
X
Gas Checking Valve
High and Low Gas Pressure
X
Switches
X
X
(contact Webster for complete information)
Burner
Gas Train
Motor HP
Gas Only
Pipe Size
HP
On-Off, LFS
1/3
1"
6 / 14"
1/3
1 1/4"
8 / 14"
1/2
1 1/2"
7 / 14"
o
F increase in air temperature over 90
Page 5
(4)
Inlet Pressure
Min. Gas
Press. Req
Modulation
7 /14"
6" wc
9 / 14"
8" wc
8 / 14"
8" wc
4. Contact Webster for complete details
o
F.
Fuel
X
X
X
X
X
Opt.
Capacity Ratings
Stand Gas
Max Firing
Fan Motor
Train Sz
Rate, MBH
1"
1,000
1-1/4"
1,500
1-1/2"
2,500
.
Introduction – Specifications & Sizing
HP
1/3
1/3
1/2
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