Lochinvar Commercial Gas Glass Lined Tanke Type Water Heater CG150 - Manual (Page 23)

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Example 2:
If initial inspection after 6 months shows 2” of lime accumulation.
Therefore, the heater should be delimed every 3 months.
FIGURE 14
DELIMING SOLVENTS
Hydrochloric base acids are not recommended for use on glass
lined tanks.
CAUTION
Observe handling instructions on label of product being used.
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit
to operate at its designed efficiency:
1. Once a month the heater should be flushed. Open drain valve
and allow two gallons of water to drain from the heater. Inlet water
valve should remain open to maintain pressure in tank.
2. A cleanout opening is provided for periodic cleaning of the tank.
Gas must be shut off and heater drained before opening cleanout.
To clean heater through cleanout opening, proceed as follows:
1. Drain heater.
2. Remove outer cover plate from lower side of heater jacket.
3. Remove six (6) hex head screws securing tank cleanout plate
and remove plate.
4. Remove lime, scale, or sediment using care not to damage the
glass lining.
5. Inspect cleanout plate gasket, if new gasket is required, replace
with part no. 9004099215.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Replace outer jacket cover plate.
In some water areas the sediment might not be removed by this
method and may result in the water heater making rumbling or
boiling noises.
IGNITION MODULE SYSTEM
Before calling your service agent, the following checklist should
be examined to eliminate obvious problems from those requiring
replacement or servicing.
— Check that “main manual gas shutoff valve” is fully open and
that gas service has not been interrupted.
— Check that after following the appliance OPERATING
INSTRUCTIONS, the “Top Knob” of the appliance gas valve
is in “ON” position.
— Check electrical supply to the appliance for possible blown (or
tripped) fusing or power interruption.
— Is the water temperature in tank below the thermostat dial
setting on the appliance thermostat (calling for heat)?
— It is possible that the high limit (E.C.O.) has functioned to shut
off the appliance. See FEATURES — Water Temperature
Control for reset procedure. Contact your serviceman if limit
continues to function to shut off appliance.
SYSTEM DIAGNOSTICS
Your water heater is equipped with an ignition module that
incorporates a diagnostic system to assist in troubleshooting
the appliance. The indicator codes on the ignition module are
as follows:
1 flash System lockout (retries or cycles exceeded)
2 flashes Pressure switch stuck close
3 flashes Pressure switch stuck open
4 flashes Open on high temperature limit switch (eco)
6 flashes 115 volt AC power reversed (check polarity)
7 flashes
Low flame sense signal (make sure flame
sensor is in burner flame)
8 flashes Check ignitor
continuous flash -> continuous flame sensed > 5 seconds without
gas valve
continuous on -> internal control failure - replace ignition control
module.
Use this diagnostic system in conjunction with the “OPERATIONAL
CHECKLIST” and the “SEQUENCE OF OPERATION” to
troubleshoot the appliance.