NOTE
(h) Remove
the
pressure
and
temperature control from the bracket..
Tag wires for identification if
color-coded wires are not used.
(3) Inspection. Inspect the control for burned
or damaged contacts and for broken or bent housing.
(i) Remove the panel box (4) from
the bracket, sliding it over the ends of the wires.
(4) Installation. Replace a defective pressure
and temperature control with a serviceable one, and
(2) Inspection. Inspect for broken panel box
install it by reversing the procedure in f (2) above.
and for damaged threads. Check for improper closure
of the cover.
information in adjusting the pressure and temperature
(3) Installation. Replace defective box with a
control.
serviceable one, and install it by reversing the
procedures in b above. Connect the wires according to
g. Water Heater Control Panel Box Bracket.
the wiring diagram in figure 4-23.
(1) Removal.
NOTE
Make sure the green ground wire
is properly connected before the
control panel box (4), and remove the cover and gasket
panel box cover is installed.
from the box.
f. Water Heater Pressure and Temperature
(b) Remove the four screws that hold
Control.
the pressure and temperature control (12) to the control
panel box bracket (11).
(1) Description.
The
pressure
and
temperature control (12, fig. 4-22) is located beside the
(c) Remove the nuts from the
water heater control panel box. It is an automatic safety
capscrews that hold the control panel box (4) to the
control. It prevents the burner from being fired until
bracket, and remove the capscrews from the box.
water is in the heater, and it prevents water that is
above 120F. from being supplied to the shower head
nozzles. When the pressure of the incoming water
from the capscrews (10), and remove the capscrews
reaches 10 pounds per square inch, the pressure
from the bracket and from the skid.
contacts in the control close. This action causes the
(e) Slide the bracket from under the
solenoid valve (4-40 i) to open and, thereby, allows fuel
pressure and temperature control and from under the
to be supplied to the burner. When, during operation,
control box, and remove the bracket from the skid.
the water temperature exceeds 120 F., the temperature
contacts open. This action causes the solenoid valve to
(2) Inspection. Inspect for bent, broken, and
close and, thereby, stops the flow of fuel to the burner.
cracked bracket.
(2) Removal.
(3) Installation. Replace defective bracket
with a serviceable one, and install it by reversing the
(a) Disconnect the temperature sensing
procedure in g (1) above.
element from the water heater upper manifold, and
remove the capillary tube from the clips on the water
h. Changeover Procedure From Penn Pressure
heater.
Temperature Control to New York-Shipley Control
(b) Disconnect the pressure sensing
Conversion Kit.
line connection at the top of the pipe tee (3, fig. 4-32).
(1) Disassembly.
(c) Remove the tee from the pressure
(a) Disconnect electrical connections
and temperature control (12, fig. 4-22).
and remove old control, including temperature bulb.
(d) Loosen the two screws that hold the
cover to the pressure and temperature control, and
remove the cover as shown in figure 4-32.
(2) Reassembly.
(e) Loosen the two wire terminal screws
(5), and remove the wires.
(a) Assemble bleed assembly (fig. 4-
37A) to new temperature-pressure control using 1/8 IPS
NOTE
x 3/4 inch long nipple.
Tag the wires for identification if
(b) Install temperature-pressure control
color-coded wires are not used.
assembly (inserting offset conduit into electrical
(f) Remove the locknut (6) from the
connection of switch box (fig. 4-37B).
nipple on the inside of the pressure and temperature
control.
(c) Attach
control
assembly
to
mounting base using four (4) No. 10-24 x /4 inch
(g) Tilt the water heater to get access to
roundhead screws and four (4) No. 10 internal tooth
the four screws (4) that hold the pressure and
temperature control to the bracket (11, fig. 4-22), and
remove the screws from the control.
(d) Assemble electrical locknut and
conduit bushing to end of offset conduit in switch box.
(e) Feed wires through offset conduit
into pressure-temperature control.
4-46
