State GPG 81 370NEA - Manual (Page 28)

28
heater where the thermostat senses the drop in water temperature
and activates main burner operation of the water heater.
If the storage tank temperature control is out of calibration, replace
with new control.
SHOulD OVerHeATING OCCur Or THe GAS SuPPly FAIl
TO SHuT OFF, TurN OFF THe mANuAl GAS CONTrOl VAlVe
TO THe Water heater.
temperature-pressure relief ValVe test
Burn hazard.
Hot water discharge.
keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
It is recommended that the Temperature-Pressure relief Valve should
be checked to ensure that it is in operating condition every 6 months.
When checking the Temperature-Pressure relief Valve operation,
make sure that (1) no one is in front of or around outlet of Temperature-
Pressure relief Valve discharge line, and (2) that water discharge
will not cause any property damage, as water may be extremely hot.
use care when operating valve as valve may be hot.
To check the pressure relief valve, lift lever at the end of valve several
times, see Figure 24. The valve should seat properly and operate freely.
If after manually operating the valve, it fails to completely reset and
continues to release water, immediately close the cold water inlet to
the water heater and drain the water heater, see Draining And Flushing
on page 32. replace the Temperature-Pressure relief
Valve with a properly rated/sized new one, see Temperature-Pressure
relief Valve on pages 12-13 for instructions on replacement.
figure 24.
If the Temperature-Pressure relief Valve on water heater weeps
or discharges periodically, this may be due to thermal expansion.
NOTe: excessive water pressure is the most common cause of
Temperature-Pressure relief Valve leakage. excessive water system
pressure is most often caused by "thermal expansion" in a "closed
system." See Closed Water Systems and Thermal expansion on
page 12. The Temperature-Pressure relief Valve is not intended for
the constant relief of thermal expansion.
Temperature-Pressure relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion
tank installed is not covered under the limited warranty. Thermal
expansion tanks must be installed on all closed water systems.
DO NOT PluG THe TemPerATure-PreSSure relIeF
VAlVe OPeNING. THIS CAN CAuSe PrOPerTy DAmAGe,
SerIOuS INJury Or DeATH.
Venting system and barometric draft control
The heater is equipped with a double acting barometric draft
control. This control assembly is factory adjusted to automatically
regulate the chimney draft imposed on the unit. The damper gate
must pivot freely in the ring guides. See Figure 23.
barometric draft control
figure 23.
examine the venting system every six months for obstructions
and/or deterioration of the vent piping.
remove all soot or other obstructions from chimney which will
retard free draft.
general
Water heater maintenance includes periodic tank flushing and
cleaning, and removal of lime scale. The power burner should be
inspected and adjusted to maintain proper combustion. refer to
Table 9. A periodic inspection of the venting system and barometric
damper should be made. Where used, the water heating system
circulating pump should be oiled per manufacturer's instructions.
Following are the instructions for performing some of the
recommended maintenance. Power burner inspection and
adjustment should be performed by a competent technician.
table 10.
recommended maintenance schedule
for the gpg heater
COmPONeNTS OPERaTION INTerNAl requIreD
Tank
Flushing monthly
Sediments
Removal
Semi-Annually
lime Scale
Removal
As required
Un»l_ime
Delimer
Relief Valve Inspect Semi-Annually
Circulating Pump
and Power
Burner motor(1)
Oiling quarterly
SAe No. 20
Non-Detergent
motor Oil
Power Burner
and Ignition
Device (2)
Inspection
and Adjustment Semi-Annually
Combustion Test
kit and Test
Specifications
main Burner
Vent System and
Inspect Semi-Annually
Barometric
Damper
Inspect Semi-Annually Draft Gauge
Anode(s) Inspect annually
remote storage tank temperature control
Water temperature in remote storage tank (if used) is controlled by the
storage tank temperature control. The sensing element is mounted
in the hot water storage tank, see Water Piping Diagram section.
A change in water temperature in the storage tank lower than the
tank temperature control setting will cause the sensor to activate the
circulating pump. The pump then circulates the water through the
maintenance