White Rodgers 37C72U Manual De Usuario
2
INSTALLATION
REPLACEMENT INFORMATION
REMOVING OLD CONTROL
1.
Shut off gas to water heater.
2.
Shut off water at cold water inlet.
3.
Connect hose to heater drain cock. Drain water to a
nearby drain. Open a hot water faucet for faster drain-
ing.
nearby drain. Open a hot water faucet for faster drain-
ing.
4.
Disconnect gas line at union (figure 1). Remove piping
from old control.
from old control.
5.
Disconnect the:
a. Thermocouple (left side).
b. Pilot burner (small tube on the right side)
c. Main burner (large tube in the middle).
6.
Remove the control by turning it counterclockwise
(
(
). If needed, a short piece of
1
/
2
” black iron pipe
can be screwed into the control inlet to increase lever-
age.
age.
SPECIAL INSTALLATION NOTE
If replacing a Unitrol or Robertshaw control, install exten-
sion adaptor fitting provided into the outlet of the control.
sion adaptor fitting provided into the outlet of the control.
INSTALLING NEW CONTROL
All piping must comply with local and state ordinances or
with the National Fuel Gas Code (ANSI Z223.1–NFPA 54),
whichever applies.
with the National Fuel Gas Code (ANSI Z223.1–NFPA 54),
whichever applies.
Dirt or contamination in the gas line can block the control
from operating creating a risk of explosion, injury or death.
To protect the control from dirt/contamination, a drip leg or
sediment trap (see Figure 1) must be installed in the piping
leading to the control.
from operating creating a risk of explosion, injury or death.
To protect the control from dirt/contamination, a drip leg or
sediment trap (see Figure 1) must be installed in the piping
leading to the control.
1.
Apply pipe joint compound to the male threads of
control, leaving the first two or three threads clean.
control, leaving the first two or three threads clean.
2.
Install control in tank. Turn clockwise (
). Use a
short piece of pipe to help in turning. Align the control so
that burner and pilot tubes may be connected.
that burner and pilot tubes may be connected.
NOTE
This control is equipped with LEFT-HAND threads on the
outlet of the control. Check the fitting on the burner assem-
bly to make sure the threads are also the LEFT-HAND type.
If the threads are not LEFT-HAND type, return the control to
the dealer and obtain an LP gas control with RIGHT-HAND
threads on the outlet.
outlet of the control. Check the fitting on the burner assem-
bly to make sure the threads are also the LEFT-HAND type.
If the threads are not LEFT-HAND type, return the control to
the dealer and obtain an LP gas control with RIGHT-HAND
threads on the outlet.
3.
Make burner, pilot, and thermocouple connections. Do
not use pipe joint compound or teflon tape. Thermo-
couple nut should be hand tightened and then turned an
additional
not use pipe joint compound or teflon tape. Thermo-
couple nut should be hand tightened and then turned an
additional
1
/
4
turn with a small wrench. DO NOT OVER-
TIGHTEN.
Figure 1. Typical gas connection
To pilot
burner
To main burner
To thermocouple
Drip leg
(sediment trap)
Pipe cap
Tee
Union
(metal-to-metal)
Gas shut-off
valve
Gas supply
pipe
A
B
C
PILO
T
LIGH
TIN
G
L
O
W
H
O
T
V
E
R
Y
H
O
T
RISK OF SCALDING
INCREASES WITH
HOTTER WATER
CAUTION:
4.
Connect gas line. Use new black iron pipe that has been
properly reamed. If old pipe is used, be sure it is clean
and free from rust and scale. Use pipe joint compound
on male threads only. (Use a pipe joint compound
approved for natural gas service.) Do not use TEFLON
tape. Do not apply compound to first two threads.
properly reamed. If old pipe is used, be sure it is clean
and free from rust and scale. Use pipe joint compound
on male threads only. (Use a pipe joint compound
approved for natural gas service.) Do not use TEFLON
tape. Do not apply compound to first two threads.
5.
DO NOT use joint compound or tape on the union
connection.
connection.
6.
To fill the water heater with water:
a. Close the water heater drain valve by turning the
handle to the right (clockwise). The drain valve is on
the lower front of the water heater.
the lower front of the water heater.
b. Open the cold water supply valve to the water
heater.
NOTE
The cold water supply valve must be left open
when the water heater is in use.
when the water heater is in use.
c. To ensure complete filling of the tank, let air exit by
opening the nearest hot water faucet. Allow water to
run until a constant flow is obtained. This will let air
out of the water heater and the piping.
run until a constant flow is obtained. This will let air
out of the water heater and the piping.
d. Check all new water piping for leaks. Repair as
needed.