3
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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; flame appearance and
heat output can be controlled at the gas valve.
The BTU Input for these appliances is shown
in
Table 1.
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
Natural
Gas
drill size (inches)
Propane
Gas
drill size (inches)
0-4500
(0-372)
#37 (.04")
*
24M00 •
.55 mm (.06")
*
42M790 •
Table 6
* Standard size installed at factory
• Part /Cat. Number
Electronic Models - Electronic models have
a fixed rate gas valve. The BTU input for the
electronic models is shown in
Table 2.
BTU Input - Electronic Models
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models
Fuel
Type
Input Rate
(BTU / HR)
MPD35ST/PF-NM Natural
30,000 high
23,000 low
MPD35ST/PF-PM Propane 28,000 high
22,000 low
Table 1
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
(.24 kPa)
0.5" WC
(2.6 kPa)
Propane
.0" WC
(2.74 kPa)
3.0" 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
(.57 kPa)
(Hi) 0.0" WC
(2.49 kPa)
Table 4
Test gauge connections are provided on the
front of the millivolt gas control valve, identi-
fied 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.
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).
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).
Manifold Gas Supply Pressure
(electronic models)
Fuel #
Maximum Manifold Pressure
Nat. Gas
(Hi) 3.5" WC (.87 kPa)
Propane
(Hi) 0.0" WC (2.49 kPa)
Table 5
BTU Input - Millivolt Models
Input (BTU) - Fixed Rate
(electronic models)
Models
Fuel
Type
Input Rate
(BTU / HR)
MPD35ST/PF-NE
Natural
30,000
MPD35ST/PF-PE
(if field converted)
Propane
28,000
Table 2
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 6
). For
elevations above 4500 feet, contact your gas
supplier or qualified 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 2
Honeywell Electronic Gas Valve
FF
O
NI
P
S
I
N
O
L
O
RT
N
O
C
GI
N
TIER
Manifold Pressure
Port
ON / OFF Switch
Inlet
Pressure
Port
Electronic Gas
Control Valve
HI
LO W
HT
PT
HT
PT
PILO
T
PIL
OT
ON
it
OFF
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
Gas Valve Diagrams
See
Figure 1
for Millivolt models and
Figure 2
For Electronic Models.
Massachusetts And New York City, NY Re-
quirements
These appliances are approved for installation
in the following USA locations listed in the
following:
