Connect Thermocouple; Connect Pilot Gas Tubing; Top View Of Standard Capacity Gas Control; Use Moderate Amount Of Pipe Compound - Honeywell V400 Manual

TWO IMPERFECT
GAS CONTROL
THREADS
PIPE
THREAD PIPE THE AMOUNT
SHOWN IN TABLE FOR
INSERTION INTO GAS CONTROL
Fig. 2—Use moderate amount of pipe compound.
PRESSURE REGULATOR
ADJUSTMENT
(BENEATH COVER SCREW)
MANUAL GAS
CONTROL KNOB
WRENCH
BOSS
PILOT
GAS
INLET
PILOT FLOW ADJ. SCREW
PILOTSTAT
(BENEATH COVER SCREW)
POWER UNIT
Fig. 3—Top view of standard capacity gas control.

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.
TABLE 4—MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRES WHEN USING Q340A THERMOCOUPLE.
THERMOCOUPLE
LENGTH
in. m
18 0.5
24 0.6
30 0.8
36 0.9
48 1.2
60 1.5
TABLE 5—MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRE WHEN USING Q309A THERMOCOUPLE.
THERMOCOUPLE
LENGTH
in. m
12 0.3
18 0.5
24 0.6
30 0.8
36 0.9
40 1.0
48 1.2
60 1.5
APPLY A MODERATE AMOUNT OF
PIPE COMPOUND TO PIPE ONLY
(LEAVE TWO END THREADS BARE).
M3075B
INSTALL
LONG
SCREW IN
OUTSIDE
CORNER
STANDARD
PRESSURE
REGULATOR
("A" MODEL)
STEP OPENING
REGULATOR ("C" MODEL)
PILOT GAS OUTLET.
PRESSURE TAPPING
DIRECTLY BENEATH
MAXIMUM LEADWIRE LENGTH X 2 (wires)
AWG NO. 14
in. m
35 0.9
29 0.7
23 0.6
17 0.4
MAXIMUM LEADWIRE LENGTH X 2 (wires)
AWG NO. 14
in. m
47 1.2
41 1.0
35 0.9
29 0.8
23 0.6
19 0.5
11 0.3
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.
Fig. 4—Always use new compression fitting.

CONNECT THERMOCOUPLE

The thermocouple connection to the power unit or ECO
M17845
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.
AWG NO. 16
in.
22
18
15
11
DO NOT USE.
AWG NO. 16
in.
30
26
22
18
15
12
7
DO NOT USE.
3
GAS CONTROL
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT.
FITTING BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED.
AWG NO. 18
m in.
0.6 13
0.5 11
0.4 9
0.3 6
AWG NO. 18
m in.
0.8 18
0.7 16
0.6 14
0.5 11
0.4 9
0.3 7
0.2
TO PILOT
BURNER
M3076A
m
0.3
0.3
0.2
0.2
m
0.5
0.4
0.4
0.3
0.2
0.2
95-6996—10