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3. Thread pipe the amount shown in Table 4 for insertion
into control. DO NOT THREAD PIPE TOO FAR. Valve
distortion or malfunction may result if the pipe is inserted too
deeply.
TABLE 4—NPT PIPE THREAD LENGTH (in.).
PIPE
THREAD PIPE
MAXIMUM DEPTH PIPE CAN
SIZE
THIS AMOUNT
BE INSERTED INTO CONTROL
3/8
9/16
1/2
3/4
3/4
13/16
4. Apply a moderate amount of good quality pipe com-
pound (DO NOT use Teflon tape) to pipe or coupling only,
leaving two end threads bare. On LP installations, use
compound resistant to LP gas. Refer to Fig. 1.
5. Remove seals over control inlet and outlet, if neces-
sary.
6. Connect pipe or coupling to control inlet and outlet. To
tighten inlet and outlet connections, use wrench on wrench
boss only. Refer to Figs. 3 and 4. If tubing is used, connect
tubing to coupling.
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 the connection.
2. Square off and remove burrs from end of tubing.
3. Unscrew brass compression fitting from the pilot out-
let (Fig. 3 or 4). Depending on gas control model, fitting
supplied may be for 1/8 or 1/4 in. tubing. Slip the fitting over
the tubing and slide out of the way.
NOTE: When replacing a control, also replace the com-
pression fitting. Never use the old compression fitting as
it may not provide a gas-tight seal. Refer to Fig. 6.
GAS CONTROL BODY
(OUTLET END)
TIGHTEN NUT ONE TURN
BEYOND FINGER TIGHT.
FITTING BREAKS OFF AND CLINCHES
TUBING AS NUT IS TIGHTENED.
Fig. 6—Always use new compression fitting.
4. Push tubing into the pilot gas tapping on the 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.
CONNECT ECO
In all applications, use Q313B Thermopile Generator
with pilot burner to act as the high-limit for the system.
WIRING
IMPORTANT
1. Since the entire control system is powered by the
millivoltage generated by the Powerpile genera-
tor, clean and scrape all wires before connecting.
Solder and tape all necessary splices using rosin
flux to prevent corrosion.
2. Control circuit cable length must not exceed 30 ft
[9 mm] of 2-wire, 18 gauge cable, or 50 ft [15 m] of
2-wire, 16 gauge cable.
Follow appliance manufacturer's wiring instructions, if
available, or use general instructions provided below. Where
instructions differ, follow appliance manufacturer instruc-
tions.
All wiring must comply with local electrical codes and
ordinances or with the National Electrical Code (ANSI/
NFPA 70), whichever applies.
Never connect these millivoltage controls to line voltage
3/8
or to a transformer.
1/2
To prevent electrical shock or equipment damage, dis-
3/4
connect power supply before making wiring connections.
1. After Powerpile generator is installed in pilot burner,
route generator lead to gas control.
2. Connect lead to gas control terminals labeled PP.
3. Connect thermostat leads as shown in Fig. 7 or 8.
Fig. 7—Typical wiring connections for gas control with
three-terminal operator.
TO PILOT
BURNER
M18973
Fig. 8—Typical wiring connections for gas control with
four-terminal operator.
3
95-6994—8
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