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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model
Series
Natural
Gas
drill size (inches)
Propane
Gas
drill size (inches)
SDV35
2.3 mm (.090")
*
37L70 •
#54 (.055")
*
99K79 •
* Standard size installed at factory
• Part /Cat. Number
Table 4
Inlet Gas Supply Pressure
(inches water column)
Fuel # Minimum Maximum
Natural Gas
5.0" WC
(1.24 kPa)
10.5" WC
(2.61 kPa)
Propane
11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 2
Manifold Gas Supply Pressure
(millivolt)
Fuel # Low High
Natural
Gas
(Lo) 2.2" WC
(.55 kPa)
(Hi) 3.5" WC
(.87 kPa)
Propane
(Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 3
Test gauge connections are provided on the front
of the millivolt gas control valve, identified IN for
the inlet and OUT for the manifold side.
Propane tanks are at pressures that will cause
damage to valve components. Verify that the
tanks have step down regulators to reduce the
pressure to safe levels.
Gas Valve Diagrams
See Figures 1 and 2 for SIT and Honeywell
Millivolt gas valve diagrams.
Gas Pressure - All Models
Tables 2 and 3 show the appliances' gas
pressure requirements:
These appliances must be isolated from the
gas supply piping system (by closing their
individual manual shut-off valve) during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than 1/2 psig (3.5 kPa).
These appliances and their individual shut-off
valves must be disconnected from the gas
supply piping system during any pressure
testing of that system at pressures greater
than 1/2 psig (3.5 kPa).
H
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HTPTHTPT
P
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P
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it
O
F
F
IN
OUT
Manifold Pressure Tap
Inlet Pressure Tap
Pilot Adjustment
Screw
HI/LO Variable
Flame Height
Adjustment
Main Gas Control Knob
OFF/PILOT/ON
Figure 1 - SIT Millivolt Gas Valve
REQUIREMENTS FOR THE COMMON-
WEALTH OF MASSACHUSETTS
These fireplaces are approved for installation in
the US state of Massachusetts if the following
additional requirements are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations 248
C.M.R.
• Installationandrepairmustbedonebya
plumber or gas fitter licensed in the Com-
monwealth of Massachusetts.
• Theexiblegaslineconnectorusedshall
not exceed 36 inches (92 centimeters) in
length.
• Theindividualmanualshut-offmustbea
T-handle type valve.
Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts, hori-
zontal terminations installed less than seven
(7) feet above the finished grade must comply
with the following additional requirements:
• A hard wired carbon monoxide detector
with an alarm and battery back-up must be
installed on the floor level where the gas
fireplace is installed. The carbon monoxide
detector must comply with NFPA 720, be
ANSI/UL 2034 listed and be ISA certified.
• Ametalorplasticidenticationplatemust
be permanently mounted to the exterior of
the building at a minimum height of eight (8)
feet above grade and be directly in line with
the horizontal termination. The sign must
read, in print size no less than one-half (1/2)
inch in size, GAS VENT DIRECTLY BELOW.
KEEP CLEAR OF ALL OBSTRUCTIONS.
NEW YORK CITY, NEW YORK (MEA)
Installation of these fireplaces are approved
for installation in New York City in the US state
of New York.
O
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Figure 2 - Honeywell Millivolt Gas Valve
GAS CONTROL
KNOB
CONVERTIBLE
HI/LO REGULATOR
(adjusts flame height
and heat output)
INLET
PRESSURE
TA P
PILOT
ADJUSTMENT
SCREW
WIRING
TERM-
INALS
OUTLET
PRESSURE
TA P
TP/TH
PIEZO
IGNITER
TH
TP
Orifice Sizes - Sea Level to High Altitude
(All Models)
These appliances are tested and approved for
installation at elevations of 0-4500 feet (0-1372
meters) above sea level using the standard
burner orifice sizes (marked with an "*" in Table
4). For elevations above 4500 feet, contact your
gas supplier or qualified service technician.
Deration - At higher elevations, the amount
of BTU fuel value delivered must be reduced
by either:
• Usinggasthathasbeenderatedbythegas
company.
• Changingtheburneroricetoasmallersize
as regulated by the local authorities having
jurisdiction and by the (USA) National Fuel
Gas Code NFPA 54/ANSI Z223.1 - latest
edition or, in Canada, the CAN/CSA-B149.1
codes - latest edition.
Install the appliance according to the regulations
of the local authorities having jurisdiction and,
in the USA, the National Fuel Gas Code NFPA
54 / ANSI Z223.1 - latest edition or, in Canada,
the CAN/CSA-B149.1 - latest edition.
NOTE: Flame appearance will diminish 4% per
thousand feet.