After Start-Up - Pentair Pool Products MASTERTEMP 250K BTU/HR Installation And User Manual

The SERVICE SYSTEM light indicates that there is
insufficient water flow to the heater. If the pump is oper-
ating, this usually indicates that the filter and/or skim-
mers should be cleaned (some filters may require back-
washing). If the light remains on after the filter/skimmers
have been serviced, the system should be checked by a
qualified service technician.
The SERVICE HEATER light indicates a fault in the
heater or its controls. If this light comes on, shut down
the heater (See TO SWITCH OFF GAS TO THE
APPLIANCE on page 6), and have a qualified service
technician check the system.
Risk of explosion or fire causing burns or
WARNING
death if safety interlocks are disabled. DO NOT attempt
to operate heater when SERVICE HEATER light is on or if
blower or burner will not start. Instead, follow instruc-
tions under "To Switch Off Gas to the Appliance," and call
a qualified service technician to repair unit.

AFTER START-UP

CHECKING WATER FLOW
Fire or flooding hazard. If the unit overheats
WARNING
and the burner fails to shut off, follow instructions under
"To Switch Off Gas to the Appliance", Page 6, and call a
qualified service technician to repair unit.
After start-up, the outlet water pipe should feel slightly
warmer than the inlet pipe. If it feels hot, or if you hear
the water in the heater boiling, there may not be enough
water flow to the appliance. Make sure that the filter is
not plugged. If water temperature remains high but the
unit continues to operate, turn off the appliance and call
your service technician.
SPRING AND FALL OPERATION
If the pool is only used occasionally, lower the pool ther-
mostat to 65° F (18° C). and leave the heater on. This
will keep the pool and the surrounding ground warm
enough so that the heater should restore the pool to a
comfortable temperature within about one day.
COLD WEATHER OPERATION
The heater may be operated in the wintertime, provided
air temperatures remain above freezing and the water
temperature is not permitted to drop below 65° F (18°
C). Extended heater operation with water temperatures
below 65° F (10° C) can result in serious damage to the
heater and is not covered by warranty.
NOTICE: When starting the heater for the swimming sea-
son with a water temperature below 50° F (10° C), the
heater may be used to heat the water; however, make
sure that the heater operates continuously until the water
temperature reaches the heater's minimum setting of 65°
F (18° C).
DO NOT operate this unit outdoors at temperatures
below 40° F (4° C).
During cold weather, if there is no danger of freezing,
operate the filter pump continuously even if the heater is
not operating. If air temperatures are expected to drop
below freezing (32° F/0° C), shut down the heater and
winterize it (See "WINTERIZING", Page 8). Allowing the
heater to freeze will void the warranty.
MAINTAINING POOL TEMPERATURE
To maintain pool temperature, make sure that the heater
switch and valving are reset to pool settings after using
the spa.
ENERGY SAVING TIPS
1. Keep the pool or spa covered when not in use. This
will reduce heating costs, reduce water evaporation,
conserve chemicals and reduce load on the filtering
system.
2. Reduce pool thermostat to 78° F (25° C) or lower;
reduce spa temperature to 100° F (38° C).
3. Use a time clock to start the filter pump at 6 a.m. or
later. The swimming pool loses less heat after day-
break.
4. For pools used only on weekends, lower the thermo-
stat setting by 10° F to 15° F (5° C to 8° C) during
the week to reduce heat loss. A properly sized heater
will restore normal temperature within one day.
5. Turn the heater off when the pool will not be used
for an extended period.
6. Follow a regular program of preventive maintenance
for the heater each new swimming season. Check
operation of the heater and its controls.
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