Trouble Shooting; Not Enough Hot Water; Water Is Too Hot; Water Heater Sounds - Lochinvar Commercial Electric Water Heaters Installation And Service Manual

7. Clean remaining gasket recess on each screw-in element
flange. Do not reuse element gaskets.
8. Install a new gasket on each element. Install element into
the tank opening where it was originally installed.
Tighten the flange with the socket and breaker bar used
to remove the element.
9. Attach wires to element terminals from which they were
removed.
10. Follow "FILLING THE WATER HEATER" instructions
to restore hot water service. Check for water leaks
around elements and proper operation when heater is
filled.

TROUBLE SHOOTING

Checklist
Before calling for service, check the following points to see
if the cause of trouble can be identified and corrected.
Reviewing this checklist may eliminate the need of a service
call and quickly restore hot water service.
Not enough or no hot water
1. Ensure that the electrical disconnect switch serving the
water heater is in the "ON" position. In some areas, water
heater electrical service may be limited by the power
company. If the heater operates on a controlled circuit,
heater recovery may be affected.
2. Check the fuses. The electrical disconnect switch usually
contains fuses. The water heater has fuses located behind
the cabinet front door. When replacing internal fuses in
the water heater control panel, insure that the same type
and size of fuse is used.
3. If the water was excessively hot and is now cold, the
manual reset high limit may have operated. To reset, turn
off electricity and push the reset button. The high limit is
located above the thermostat on surface thermostat
models, above the upper most heating element in the
storage tank on immersion thermostat models. Repeat
operation of the high temperature cut-off should be
investigated by your mechanical contractor or by a
qualified technician. A contactor or thermostat may be
malfunctioning.
4. The capacity of the heater may have been exceeded by a
large demand for hot water. Large demands require a
recovery period to restore water temperature.
5. Cold incoming water temperature will lengthen the time
required to heat water to the desired temperature. If the
heater was installed in the summer when incoming water
temperature was warm, colder ground water in the winter
months can create the effect of less hot water.
6. Look for wasted hot water and leaking or open hot water
faucets.
7. Sediment or lime scale may be affecting water heater
operation. Refer to "Maintenance" for details.

Water is too hot

1. Refer to "Temperature Regulation" and reset the
thermostat setpoint to a lower temperature that will meet
requirements for hot water
Water heater makes sounds
1. Sediment or lime scale accumulation on the elements
causes sizzling and hissing noises, when the heater is
operating. If this occurs, the tank bottom and elements
should be cleaned. Refer to "MAINTENANCE" for
details.
2. Some of the electrical components of the water make
sounds which are normal. Contactors will "click" or snap
as the heater starts and stops.
contactors often hum.
Water leakage is suspected
1. Check to see if the drain valve is tightly closed.
2. The apparent leakage may be condensation which forms
on cool surfaces of the heater and piping.
3. If the outlet of the relief valve if leaking, it may represent:
a. Excessive water pressure.
b. Excessive water temperature.
c. Faulty relief valve.
Excessive water pressure is not the most common cause of
relief valve leakage. It is often caused by a "closed system."
A check valve, a back flow preventer or pressure reducing
valve, in the inlet system will not permit the expanded hot
water volume to equalize pressure with the main. A relief
valve must release this water or the water heater and
plumbing system will be damaged.
When such a condition is encountered, local codes or
inspection agency should be consulted to determine which
of the following procedures is acceptable in your area.
Installation of an expansion tank.
Removal of the check valve.
4. Examine the flange area of the elements for gasket
leakage. Tighten the screw-in flange or, if necessary,
follow the "Water and Lime Scale Removal" procedure to
remove the element and replace the "O" ring gaskets that
seal each element.
IF YOU CANNOT IDENTIFY
OR CORRECT THE SOURCE
OF MALFUNCTION:
1. Place the water heater electrical disconnect switch on the
"OFF" position.
2. Contact your mechanical contractor or service
technician.
Revision Notes: Revision 2 (ECO #C02870) reflects the
addition of the scald chart on page 10.
16
Transformers and
CP-5M-1/09-Printed in U.S.A.