After Start-Up; Spring, Fall (Autumn) And Winter Operation - Pentair MASTERTEMP 200HD Installation And User Manual

Section 4. Maintenance
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AFTER START-UP

CHECKING WATER FLOW
Fire or flooding hazard. If the unit overheats and the burner fails to shut off, follow instructions under "To Turn Off Gas to the
Appliance", page 41, 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 AUTUMN OPERATION
If the pool is only used occasionally, lower the pool thermostat to 20° C (68° F) 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.
WINTER OPERATION
• Operating this heater continuously at water temperatures below 20° C (68° F.) will cause harmful condensation and will
damage the heater and void the warranty.
• If the heater has been drained for freezing condition, do NOT turn "ON" until the system is circulating water.
• Water trapped in the heat exchanger can result in freeze damage to the exchanger or headers. Freeze damage is specifically
not covered by the warranty.
• When starting the heater for the swimming season with a water temperature below 10° C (50° F), 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 20° C (68° F). 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 0° C (32° F), shut down
the heater and winterize it.
For outdoor heaters in freezing climates, shut the heater down and drain it for winter as follows:
1. Turn off electrical supply to the heater and pump.
2. Close the external manual shut-off gas valve (located outside the heater).
3. In colder climates where they may be required, open drain cock located on the bottom of the manifold adapter, and drain the
heat exchanger and manifold adapter completely. If heater is below pool water level, be sure to close isolation valves to prevent
draining the pool (isolation valves are not required and should not be used on heaters installed above pool water level except
when needed for winterizing valves). Assist the draining by blowing out the heat exchanger through the pressure switch fitting
with low pressure compressed air (less than 35 kPa or 5 PSI).
Explosion hazard. Purging the system with compressed air can cause components to explode, with risk of severe injury or
death to anyone nearby. Use only a low pressure (below 35 kPa or 5 PSI), high volume blower when air purging the heater,
pump, filter, or piping.
. Remove the Water Pressure Switch. Plug the port in the manifold to prevent bugs and dirt from getting into the
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manifold.
5. Drain the plastic inlet/outlet manifold through the outlet pipe. If the pipe does not drain naturally to the pool, install
a drain cock in the outlet pipe to drain the manifold.
6. Cover air inlet grate with a plastic bag to prevent bugs, leaves, etc., from getting into the heater.
MasterTemp Pool and Spa Heater
WARNING
CAUTION
WARNING
P/N 474131 Rev. M 8/2020