SERVICING
60
IGNITER
CONTROL
HONEYWELL
MATES WITH
SOCKET HOUSING
MOLEX 39-01-0240
TO CONTROL
O
F
F
O
N
IN
1/2PSI
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
HONEYWELL MODEL SV9501
S-306 CHECKING ORIFICES
A predetermined fixed gas orifice is used in all of these fur-
naces. That is an orifice which has a fixed bore and position.
A
GAS
STREAM
B
DENT OR
BURR
GAS
STREAM
B
The length of Dimension "A" determines the angle of Gas
Stream Defraction,"B".
A dent or burr will cause severe deflection of gas stream.
No resizing should be attempted until all factors are taken
into consideration such as inlet manifold gas pressure, align-
ment, and positioning, specific gravity and BTU content of
the gas being consumed.
The only time resizing is required is when a reduction in firing
rate is required for an increase in altitude.
Orifices should be treated with care in order to prevent dam-
age. They should be removed and installed with a box-end
wrench in order to prevent distortion. In no instance should
an orifice be peened over and redrilled. This will change the
angle or deflection of the vacuum effect or entraining of pri-
mary air, which will make it difficult to adjust the flame prop-
erly. This same problem can occur if an orifice spud of a
different length is substituted.
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
INSTALLING THIS UNIT.
MULTIPLE POWER SOURCES MAY
BE PRESENT.
F
AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
1. Check orifice visually for distortion and/or burrs.
2. Check orifice size with orifice sizing drills.
3. If resizing is required, a new orifice of the same physical
size and angle with proper drill size opening should be
installed.
S-307 CHECKING GAS PRESSURE
Gas inlet and manifold pressures should be checked and
adjusted in accordance to the type of fuel being consumed.
WARNING
D
ISCONNECT GAS AND ELECTRICAL POWER SUPPLY.
1. Connect a water manometer or adequate gauge upstream
of the gas valve. (If no provisions are provided, we sug-
gest removing cap from dripleg and install a predrilled
cap with hose fitting as shown in the following drawing.)
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