NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. 3
New York City, New York (MEA)
Installation of these fi replaces are approved
for installation in New York City in the US state
of New York.
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models Fuel Type Input Rate
(BTU / HR)
SSDVST
SSDVPF
Natural or
Propane Gas
37,500 high
30,000 low
Table 1
Electronic Models - Electronic models have
a fi xed rate gas valve. The BTU input for the
electronic models is shown in Table 2.
BTU Input - Electronic Models
Gas Pressure - All Models

Tables 3, 4 and 5 show the appliances' gas

pressure requirements:

Inlet Gas Supply Pressure
(all models)
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 3
Manifold Gas Supply Pressure
(millivolt models)
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 4
Test gauge connections are provided on the
front of the millivolt gas control valve, identi-
fi ed IN for the inlet and OUT for the manifold
side. A 1/8" NPT Test gauge connection
is provided at the inlet and outlet side of
the electronic gas control valve.
Manifold Gas Supply Pressure
(electronic models)
Fuel # Maximum Manifold Pres-
sure
Natural Gas (Hi) 3.5" WC (.87 kPa)
Propane (Hi) 10.0" WC (2.49 kPa)
Table 5
Input (BTU) - Fixed Rate
(electronic models)
Models Fuel Type Input Rate
(BTU / HR)
SSDVST
SSDVPF
Natural or
Propane Gas 37,500
Table 2
• • Burner Orifi ce Sizes (all models)
Elevation
Feet (meters) Natural Gas
drill size (inches) Propane Gas
drill size (inches)
0-4500
(0-1372) #44 (.086") *
60J8001 •
#55 (.052")*
19L5201 •
Table 6
* Standard size installed at factory
• Part /Cat. Number
• • Each model has two burners & 2 Orifi ces
Gas Valve Diagrams - See Figure 1 for Millivolt
models and Figure 2 For Electronic Models.
H
I
LO
W
H
TPT
HT
P
T
P
I
L
O
T
P
I
L
O
T
O
N
it
O
F
F
IN OUT
Manifold Pressure Tap
Inlet Pressure Tap
SIT Millivolt Gas Valve
Pilot Adjustment
Screw
HI/LO Variable
Flame Height
Adjustment
Main Gas Control Knob
OFF/PILOT/ON
Figure 1
Orifi ce 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 6). For
elevations above 4500 feet, contact your gas
supplier or qualifi ed service technician . 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
CAN1-B149.1 and .2 codes - latest edition.
Figure 2Honeywell Electronic Gas Valve
FFO
NI
PSI
NO
L
O
R
T
N
O
C
G
INT
IER
Manifold Pressure
Port ON / OFF Switch
Inlet
Pressure
Port
Electronic Gas
Control Valve

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 pres-

sure testing of that system at pressures

greater than 1/2 psig (3.5 kPa).

These fi replaces are designed as supplemen-
tal heaters. Therefore, it is advisable to have
an alternate heat source when installed in a
dwelling.
Millivolt Models - The millivolt appliances are
manually controlled and feature a spark igniter
(piezo) that allows the appliance's pilot gas to
be lit without the use of matches or batteries.
This system provides continued service in the
event of a power outage.
Millivolt models come standard with a manu-
ally-modulated gas valve; fl ame appearance and
heat output can be controlled at the gas valve.
The BTU Input for these appliances is shown
in Table 1.