Laars HWG-M2-150 Installation, Operation And Maintenance Instructions - page 11
9600 HWG Water Heater
Page 11
9.
Using the temperature gauge, check the unit outlet
temperature after three to four minutes of operation.
Minimum operating temperature 160°F.
10. Shutdown instructions.
Turn off all Electrical power to the unit at main
power switch located on Field Wiring Box cover.
Turn gas cock dial to off position.
SECTION 5.
Maintenance
5A. Owner Care and Maintenance
1.
Inspect venting system annually. Inspect the
outside vent terminal fittings to make sure that
they are free of obstructions. Clean if necessary.
2.
Inspect the condensate drainage system - this can
be done by removing the screws that secure the
lower front panel to the unit. There should be no
signs of water leakage from any of the visible
fittings or hose (see Figure 9).
3.
The pressure relief valve should be operated
manually at least once a year. To do this place a
suitable container under the relief valve drain
pipe. The discharge from this valve will be at
high pressure and temperature. Make sure that
overspray of hot water will not cause damage or
bodily harm. Use the relief valve handle to
discharge water into the container.
NOTE: Do not use this appliance if any part
has been under water. Immediately call a qualified
service technician to inspect the appliance and to
replace any part of the control system and any gas
control which has been immersed.
Keep appliance area clear and free from
combustible materials, gasoline and other flammable
vapors and liquids.
NOTE: There are no moving parts requiring any
lubrication in this unit.
Keep appliance area clear and free of items that
could obstruct ventilation air around the water heater.
SERVICE MAINTENANCE - To be done by
a qualified service person.
5B. Routine De-Liming Procedure
CAUTION: Use all protective gear and precau-
tions suggested by deliming solution manufacturers.
In hard water areas, this should be done on a
regularly scheduled basis. (If water hardness is over
10 grains, a water softening system must be installed.)
1.
Close the gas cock or manual gas shutoff (see
Figure 11) and shut off the main disconnect switch.
2.
Isolate the 9600 HWG unit from the system by
closing the shutoff valves. If recirc. lines are piped,
isolate the return system from water heater.
3.
Remove the lower front panel from the water
heater and connect a hose to the drain fitting.
(Located under the cylindrical chamber). Relieve
pressure at drain.
4.
Connect a hose to the drain (provided by
installer) on the cold (return) side piping to the
appliance.
5.
Remove cover from thermostatic valve and
remove thermostat. Wrap tape around / over
cutaway sections in the cover and replace all
parts except thermostat. Reinstall valve cover
and tighten bolts.
6.
Fill the water heater combustion coil with
deliming solution from the hose connected under
boiler coil assembly until it exits from upper
hose. A small pump should be used to do the
filling from a plastic container. The upper hose
should then be placed in this container and the
pump should run until the circulating solution is
no longer foamy.
7.
Shut off pump and disconnect from hose. Carefully
drain solution from hoses and connect city water to
lower hose to flush combustion coil. Flush for
approximately 5 minutes with city water.
8.
Remove hoses, close drain cock, close drain on
cold / return, and replace lower front panel .
9.
Remove cover from thermostatic valve and
remove tape. Replace thermostat, spring, brass
ring and valve cover, and tighten bolts.
10. Open shut off valves and purge air from petcock
at top of thermostatic valve cover.
11. Re-open gas supply and turn on main disconnect
switch to return heater to service.
5C. Thermostat Replacement
1.
Isolate the water heater and relieve pressure.
2.
Remove the screws (4) and access cover from the
jacket top.
3.
Remove the hex head machine screws (3) from
the top of the thermostatic valve, remove the
valve top and internal parts.
4.
Install new parts (P/N 2400-130).
5.
Install new O-ring valve top and replace valve
top on valve and install and tighten screws
6.
Restore pressure to water heater, bleed air from
the petcock on the valve and restart water heater.
7.
Replace access cover.
5D. Vent and Condensate Drain
Inspection (performed annually)
1.
Inspect the vent terminals for blockage or
restrictions.