11
•
DO NOT
apply insulation to the top of the water
heater, as this will interfere with safe operation of the
draft hood. See
•
DO NOT
cover the thermostat or the temperature-
pressure relief valve.
•
DO NOT
allow the insulation to come within 2 inches
(5 cm) of the floor to prevent blockage of combustion
air flow to the burner.
•
DO NOT
cover the instruction manual. Keep it on the
side of the water heater or nearby for future reference.
•
DO
obtain new warning and instruction labels from
the manufacturer for placement on the blanket directly
over the existing labels.
•
DO
inspect the insulation blanket frequently to make
certain it does not sag, thereby obstructing the
combustion air flow.
HARD WATER
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This
will protect the dishwashers, coffee urns, water heaters,
water piping and other equipment. See the
Removal of Lime Deposits From Tank Type Commercial
(page 30) for sediment and lime scale
removal procedures.
CIRCULATION PUMPS
A circulating pump is used when a system requires
a circulating loop or there is a storage tank used in
conjunction with the water heater. See
and
for
installation location of circulating pumps.
See the circulation pump wiring diagrams (
) for electrical hookup information. Install
in accordance with the current edition of the
National
Electrical Code, NFPA 70
or the
Canadian Electrical Code,
CSA C22.1
.
All bronze or stainless steel circulating pumps are
recommended for use with commercial water heaters.
Some circulating pumps are manufactured with sealed
bearings and do not require further lubrication. Some
circulating pumps must be periodically oiled. Refer to
the pump manufacturer’s instructions for lubrication
requirements.
CIRCULATING PUMP WIRING DIAGRAM
STORAGE TANK OR BUILDING RECIRCULATION
FIELD SUPPLIED TEMPERATURE CONTROL
INSTALLED IN THE STORAGE TANK
OR CIRCULATING LOOP RETURN LINE
CIRC
PUMP
MOTOR
L1 HOT
L2 NEUTRAL
120 VAC
POWER
NOTE:
USE SEPARATE 120 VAC POWER
SUPPLY FOR PUMP CIRCUIT. DO NOT
SHARE POWER WITH APPLIANCE AS THIS
MAY CAUSE ELECTRICAL LINE NOISE AND
LEAD TO ERRATIC CONTROL SYSTEM
OPERATION.
FIGURE 9. STORAGE TANK/BUILDING RECIRCULATION
CIRCULATING PUMP WIRING DIAGRAM
DISHWASHER LOOP WITH TOGGLE SWITCH
FIELD SUPPLIED TEMPERATURE
CONTROL INSTALLED IN THE
CIRCULATING LOOP RETURN LINE
DISHWASHER
TOGGLE
SWITCH
CIRC
PUMP
MOTOR
L1 HOT
L2 NEUTRAL
120 VAC
POWER
NOTE:
USE SEPARATE 120 VAC POWER
SUPPLY FOR PUMP CIRCUIT. DO NOT
SHARE POWER WITH APPLIANCE AS THIS
MAY CAUSE ELECTRICAL LINE NOISE AND
LEAD TO ERRATIC CONTROL SYSTEM
OPERATION.
FIGURE 10. DISHWASHER LOOP WITH TOGGLE SWITCH
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