3
95-6996—10
TABLE 5—MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRE WHEN USING Q309A THERMOCOUPLE.
THERMOCOUPLE
MAXIMUM LEADWIRE LENGTH X 2 (wires)
LENGTH
AWG NO. 14
AWG NO. 16
AWG NO. 18
in.
m
in.
m
in.
m
in.
m
12
0.3
47
1.2
30
0.8
18
0.5
18
0.5
41
1.0
26
0.7
16
0.4
24
0.6
35
0.9
22
0.6
14
0.4
30
0.8
29
0.8
18
0.5
11
0.3
36
0.9
23
0.6
15
0.4
9
0.2
40
1.0
19
0.5
12
0.3
7
0.2
48
1.2
11
0.3
7
0.2
60
1.5
DO NOT USE.
3. Unscrew brass compression fitting from pilot gas
outlet. Refer to Fig. 4. Slip fitting over tubing and slide out
of way.
NOTE: When replacing a control, cut off old compression
fitting and replace with new compression fitting provided
on new combination gas control. Never use old com-
pression fitting as it may not provide a gas-tight seal.
Refer to Fig. 4.
4. Push tubing into pilot gas tapping on outlet end of the
control until it bottoms. While holding tubing all the way in,
slide fitting into place and engage threads. Turn until finger
tight. Then tighten one more turn with wrench. Do not
overtighten.
5. Connect other end of tubing to pilot burner according
to pilot burner manufacturer’s instructions.
TABLE 4—MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRES WHEN USING Q340A THERMOCOUPLE.
THERMOCOUPLE
MAXIMUM LEADWIRE LENGTH X 2 (wires)
LENGTH
AWG NO. 14
AWG NO. 16
AWG NO. 18
in.
m
in.
m
in.
m
in.
m
18
0.5
35
0.9
22
0.6
13
0.3
24
0.6
29
0.7
18
0.5
11
0.3
30
0.8
23
0.6
15
0.4
9
0.2
36
0.9
17
0.4
11
0.3
6
0.2
48
1.2
DO NOT USE.
60
1.5
CONNECT PILOT GAS TUBING
1. Cut tubing to desired length and bend as necessary
for routing to pilot burner. Do not make sharp bends or
deform tubing. Do not bend tubing at control after compres-
sion nut has been tightened, as this may result in gas
leakage at connection.
2. Square off and remove burrs from end of tubing.
Fig. 2—Use moderate amount of pipe compound.
Fig. 3—Top view of standard capacity gas control.
Fig. 4—Always use new compression fitting.
CONNECT THERMOCOUPLE
The thermocouple connection to the power unit or ECO
connector (Fig. 3) is an electrical connection and must be
clean and dry. Never use pipe compound. Tighten only
1/4 turn beyond finger tight to give good electrical
continuity.
CONNECT ECO (Standard-Capacity models only)
If the ECO is provided, the leadwires must be equipped
with insulated 1/4 in. female quick-connect terminals.
Leadwire lengths must not exceed the lengths shown in
Tables 4 and 5. Connect high limit or ECO leadwires to the
two terminals on the thermocouple.
If ECO is not provided, connect a Q313B Thermopile
Generator in place of the thermocouple to act as the high-
limit for the system.
TWO IMPERFECT
THREADS
GAS CONTROL
THREAD PIPE THE AMOUNT
SHOWN IN TABLE FOR
INSERTION INTO GAS CONTROL
APPLY A MODERATE AMOUNT OF
PIPE COMPOUND TO PIPE ONLY
(LEAVE TWO END THREADS BARE).
M3075B
PIPE
GAS CONTROL
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT.
FITTING BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED.
TO PILOT
BURNER
M3076A
PRESSURE REGULATOR
ADJUSTMENT
(BENEATH COVER SCREW)
GAS
INLET
MANUAL GAS
CONTROL KNOB
WRENCH
BOSS
STANDARD
PRESSURE
REGULATOR
("A" MODEL)
STEP OPENING
REGULATOR ("C" MODEL)
INSTALL
LONG
SCREW IN
OUTSIDE
CORNER
PILOT GAS OUTLET.
PRESSURE TAPPING
DIRECTLY BENEATH
PILOT FLOW ADJ. SCREW
(BENEATH COVER SCREW)
PILOTSTAT
POWER UNIT
M17845
INLET
OFF
ON
PILOT