Ozroll OZS251E, Installation Manual

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I. System Maintenance / Periodic Inspections
I1. Valves / Fittings & Draining the tank
- The Pressure / Temperature ( P / T ) safety relief valve is mounted on the top of the storage tank. This valve
should be opened and checked every 6 months by releasing the valve ( see Caution information below ). This
flushes any lime deposits out of the valve which can clog it and make it not function correctly. Allow hot water to
flow through the valve briefly to ensure correct operation and clean the valve. It is recommended that the valve
is replaced every 5 years
CAUTION – HOT WATER will flow out of the discharge pipe connected to the valve when released. Ensure that
you avoid any contact with the hot water to prevent scalding
NOTE : If a Expansion Control Valve ( ECV ) has not been fitted then it is normal from time to time for a small
amount of water to drip from the discharge pipe connected to the P / T valve
- Check all other valves and copper fittings to ensure there are no leaks. NOTE : It is normal for water to drip
from time to time from the discharge pipe connected to the Expansion Control Valve ( ECV ). This drip is due to
expansion of hot water in the system which may exceed the setting on the ECV
Draining the tank
The tank may need to be drained from time to time for maintenance reasons
CAUTION: The tank MUST be completely electrically isolated from the Mains power supply PRIOR to draining
water. HOT WATER will flow out of the drain nut when it is removed. Ensure that you avoid any contact with the
hot water to prevent scalding
CAUTION: Draining of the tank MUST be done by a qualified person only. The homeowner should NOT ATTEMPT
to drain the tank
Each tank is equipped with a drain hole at the bottom of the tank marked “Drain” The brass fitting should be
slowly opened to release water from the tank – CAUTION HOT WATER BURNS. A tap should be opened inside
the home to release the pressure in the system to ensure that the water drains properly from the tank.
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