EZ Plate™ Storage Water Heater
16
PV500-64 12/14
8 MAINTENANCE
WARNING: Turn off all electrical service to the appliance before accessing electrical components or
terminals located inside the control cabinet, junction boxes or at other points of wiring access. These
terminals and components may be high voltage. Close and fasten the control cabinet cover, junction boxes
and all other points of wiring access before restoring electrical service to the appliance. If the electrical
service is not turned off and these components or terminals are touched, a dangerous shock can occur,
which can result in property damage, personal injury or death.
Coupez l'alimentation avant intervention sur l'appareil.
8.1 Temperature and Pressure Relief Valve
Manually test-operate the temperature and pressure relief valve(s) (T&P) on the storage tank and the pressure relief
valve (PRV) on the heat exchanger at least once a year by briefly lifting the relief valve lever. If a relief valve does
not open and close properly when test-operated, it must be replaced with a new relief valve of the same type, rating
and relieving capacity as the original equipment relief valve it is replacing. See the sections titled “Storage Tank
Relief Valve Piping and “Heat Exchanger Relief Valve Piping” for important instructions and warnings.
8.2 Thermostats and Temperature Limiting Device
The temperature limiting device and thermostat temperature sensors extend into the water in the tank. Depending on
the water conditions in your area, scale may coat the sensors. This coating will affect accuracy of sensors and can
allow water temperature to exceed the desired limits. Remove and inspect these controls at necessary intervals and
remove scale if present.
8.3 Control Valve Actuator (if supplied)
The boiler water control valve actuator is sealed and requires no maintenance. Durability of valve stems and packing
is dependent upon maintaining non-damaging water conditions. Inadequate water treatment or filtration can result in
corrosion, scale, and abrasive particle formation. Scale and particulates can result in stem and packing scratches
and can adversely affect packing life and other parts of the hydronic system. Contact the manufacturer for
replacement packing and stem & plug assembly.
8.4 Tank
Depending on water quality and operating temperature, scale can form during operation and will accumulate on the
bottom of the tank. Inspect the tank every six months or more frequently if higher scaling conditions are present. To
help prevent the accumulation of scale, flush the tank at the appropriate interval, based on water conditions in your
location.
To flush:
turn off the electrical disconnect switch to remove power and to prevent the unit from operating.
Open the drain valve and allow water to flow through the tank until it runs clear. Close the drain valve and turn on
the electrical disconnect switch to restore power.
NOTICE:
Since PVI cannot control the use of the appliance, water conditions, or maintenance, the warranty on the
appliance does not cover poor performance, structural failure, or leaking due to an excessive accumulation of scale.
a. If the unit requires shut down, remove all power from the system and close all boiler water and cold water supply
valves to the unit. If the water heater is removed from service for an extended period of time, the storage tank,
heat exchanger and piping must also be drained completely, to reduce the risk of damage by freezing, biologic
growth or by corrosion from stagnant water conditions.
b. When the appliance is returned to service, conduct a thorough inspection of all utilities and general appliance
condition.
