HTP HPW-50-6 - Manual (Page 17)

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LP-374 REV. 3.25.14
A heat pump water heater equipped with a DR module will automatically recognize what energy cost rate is available and adjust its
mode and temperature setting to use less energy when rates are medium, high, and critical. When the heat pump water heater
responds to these signals,
it will display the letters “EP” in the screen, along with other information indicating that energy pricing periods
are in effect. When the signal is low or when no DR module is connected, the unit will continue to run.
PART 4 – MAINTENANCE, VACATION, AND CLEANING
A. ROUTINE PREVENTIVE MAINTENANCE
Before manually operating the relief valve, make certain no one will be exposed to the hot water released by the valve. The water may
be hot enough to create a scald hazard. The water should be released into a suitable drain to prevent property damage, severe
personal injury, or death from scalds.
NOTE: If the temperature and pressure relief valve on the hot water heater discharges periodically, this may be due to thermal
expansion in a closed water system. Contact the water supplier or your plumbing contractor on how to correct this. Do not plug the relief
valve outlet.
If properly maintained, your water heater will provide years of dependable, trouble-free service. It is suggested that a routine preventive
maintenance program be established and followed by the user.
Periodic Inspection
It is further recommended that a periodic inspection of the operating controls, heating elements, and wiring should be conducted by
service personnel qualified in electric water heater repair.
Most electrical water heaters, even when new, make some sound when in operation. If the hissing or singing sound level increases
excessively, the electric heating element may have scale buildup and require cleaning or replacement. Contact a qualified installer or
plumber for inspection.
Temperature and Pressure Relief Valve
At least once a year, lift and release the lever handle on the temperature and pressure relief valve, located on the back left side of the
water heater, to make sure the valve operates freely. Allow several gallons of water to flush through the discharge line to an open drain.
Before manually operating the relief valve, make certain no one will be exposed to the hot water released by the valve. The water
drained from the tank may be hot enough to present a scald hazard. Failure to do so could lead to property damage, serious personal
injury, or death.
Flushing the Tank
The water heater tank can act as a settling basin for solids suspended in water. It is therefore not uncommon for hard water deposits to
accumulate in the bottom of the tank. To clean the tank of these deposits, open the drain valve (located under the large decorative
cover near the bottom of the unit) and drain a few quarts of water from the water heater every month.
B. DRAINING THE WATER HEATER
Shut off power to the water heater before draining water. Failure to do so could lead to property damage, serious personal injury, or
death.
Attach a garden hose to the drain valve located at the
bottom of the unit and direct the hose to a drain. The
decorative front cover must be removed to access
this valve.
In order to completely drain the water heater, turn off
the cold water supply. Open a hot water faucet or lift
the handle on the relief valve to admit air into the
tank.
Open the drain valve. When done draining, close the drain valve, reopen the cold water supply, and refill the tank. Open a hot water
faucet to vent the system of air.
Figure 15 – Drain Valve Location