Sterling SF User Manual
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Digit #1, 2 - Unit Type [UT]
Digit #12 - Motor Type [MT]
SF - Separated Combustion Tubular Propeller
1 - Open Drip Proof (Standard)
2 - Totally Enclosed
Digit #3, 4, 5 - Capacity [CA]
100 - 100,000 BTU/HR
Digit #13 - Blower Motor Sizes [MS]*
125 - 125,000 BTU/HR
0 - None/Not Applicable
150 - 150,000 BTU/HR
*Note: Blower Motor Size [MS] not applicable for propeller type unit heaters.
175 - 175,000 BTU/HR
200 - 200,000 BTU/HR
250 - 250,000 BTU/HR
Digit #14 - Accessories [AS]
300 - 300,000 BTU/HR
350 - 350,000 BTU/HR
FACTORY INSTALLED
400 - 400,000 BTU/HR
M6 - OSHA Type Fan Guard
S3 - 409 Stainless Steel Flue Collector
P4 - Terminal Block Wiring
S5 - 304L Stainless Steel Burners
Digit #6 - Furnace Type [FT]
P6 - Summer/Winter Switch
A - Right Side Access
Digit #7 - Heat Exchanger Construction Material [FM]
1 - Standard (Aluminized) Steel
† FIELD INSTALLED (AS-____ )
2 - 409 Stainless Steel
All Field Installed Accessories are to be entered as a separate line item using catalog
number which utilizes “AS” as a prefi x. i.e: A7 becomes AS-A7.
Digit #8 - Gas Type [GT]
N - Natural Gas
A7 - Pressure Regulator 1/2-2 psi
P5 - 24V SPST Relay-Specify Purpose
P - Propane Gas (LP)
G1 - 1-Stage T87K Mercury Free Thermostat
X2 - 30 Degree Downturn Nozzle
Digit #9 - Altitude [AL]
w/Subbase Kit
X3 - 60 Degree Downturn Nozzle
G2 - 1-Stage T87K Mercury Free Thermostat
X4 - 90 Degree Downturn Nozzle
S - 0–4,999 ft.
w/TG511A Guard Kit
X5 - Vertical Louver Kit
T - 5,000–11,999 ft.
G3 - 1-Stage T834N Mercury Free
Note: Installations over 2,000 ft. require gas input deration in the field.
Thermostat/Fan Switch
X7-H5 - Horiz. Combustion Air Inlet Kit, 5 inch
Refer to unit installation instructions.
G5 - 2-Stage TH5220D Mercury Free
(Unit Capacity 100-250)
Thermostat w/Subbase
X7-H6 - Horiz. Combustion Air Inlet Kit, 6 inch
Digit #10 - Direct Spark Gas Control [GC]
G6 - Locking Thermostat Cover
(Unit Capacity 300-400)
1 - Single Stage
G8 - 1-Stage T6169C Line Voltage Stat
X7-V5 - Vert. Combustion Air Inlet Kit, 5 inch
2 - Two Stage
w/Subbase
(Unit Capacity 100-250)
3 - Electronic Modulation w/Room Sensing
G9 - 1-Stage T822K Mercury Free
X7-V6 - Vert. Combustion Air Inlet Kit, 6 inch
4 - Electronic Modulation w/Duct Sensing
Thermostat
(Unit Capacity 300-400)
5 - Electronic Modulation w/Duct Sensing & Room Override Stat
6 - Electronic Modulation w/External 4-20 mA Input
M2-2 - Vent Caps (5") (Unit Capacity 100-250)
7 - Electronic Modulation w/External 0-10 VDC Input
M2-3 - Vent Caps (6") (Unit Capacity 300-400)
Digit #11 - Supply Voltage [SV]
1 - 115/1/60 5 - 230/3/60
2 - 208/1/60 6 - 460/3/60
3 - 230/1/60 7 - 575/3/60
4 - 208/3/60 Z - Special
Note: Supply Voltages [SV] 2-7 include field mounted step down transformer.
SEPARATED COMBUSTION TUBULAR PROPELLER
UNIT NUMBER DESCRIPTION
DIGIT
T
X
X
X
–
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+
ITEM
PREFIX
UT
CA
FT FM GT AL GC SV MT MS
AS
(Internal Use Only)