Bajaj Storage Water Heater User Manual - page 5
bajaj electricals limited Page 5 of 8
WIRING
All the electrical connections inside the Heater are done at the factory. The water heater
is provided with a supply cord and 3 pin plug, which should be connected to main power
supply. Make sure that the connections in the plug and socket are right, and proper
earthing is provided to the unit.
1. Thermal cut-out
2. Thermostat
3. Heating Element
4. Green Neon Lamp.
5. Red Neon Lamp.
Under normal conditions the safety devices that come with our Storage Water Heaters
are sufficient to provide complete protection and smooth operation. However, the
following additional devices are available for special needs and requirements.
PRESSURE REDUCING VALVE:
If water pressure is more than 30 P.S.I. at the inlet i.e. the total height between the heater unit
and overhead water supply tank is more than 70 feet, a Pressure reducing valve has to be fitted
at the inlet pipe.
DEAD WEIGHT VALVE:
This is a device used to prevent excess build-up of pressure. This should be used especially i)
When a pressure reducing valve OR ii) a non-return valve is used in the inlet pipe. This can be
installed at the vent pipe. Where this is not possible, it can be installed at the outlet.
VACUUM RELIEF VALVE:
In many cases, especially in multi-storeyed buildings, there is the problem of low
water pressure. In such cases, water in the heater flows back and out through the
inlet pipe. There is no air to fill the space created as a result of the water flowing
back. Hence, there is a vacuum, which puts pressure inward thereby leading to the
collapse of the tank.
To prevent this from happening, a VRV (Vacuum Relief Valve) should be provided at
the outlet or at the vent pipe. This device lets the air go inside the tank and fill the
vacuum and prevents tank collapse.
THE OPERATION PROCESS
Operation Instructions:
Normally, Water heaters are connected to the water tank situated on top of the
house. Since the heater unit is designed to operate at a given working pressure, the
exact installations are different. To help you install the unit correctly, various
alternatives are shown in Fig. 9, 10, 11,12 and 13.
1.
Do not switch ON before filling the heater unit with water.
2.
Leave the hot water outlet open and open the inlet valve to allow the heater unit to be filled with water. After
it is full the water will start flowing out from the Outlet.
3.
Now close the tap at the outlet. ALWAYS KEEP THE INLET VALVE OPEN.
4.
Switch ON the power supply. Green neon lamp will glow ON to indicate that water is getting heated.
5.
When the water has reached the set temperature green light will go OFF. This indicates that the thermostat
has operated and has switched OFF the power supply to the unit. You should withdraw the water only after
the green light has switched OFF. Water at desired temperature is now available for use.