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John Wood SERIES 100 User Manual

Page 24

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24

DRAIN VALVE AND ACCESS PANELS

The heaters are equipped with a 3/4" drain valve.

An access panel covers the cleanout opening in the tank which is sealed by

a gasket and cover, figure 25.

RELIEF VALVE

At least twice a year, the temperature and pressure relief valve should be

checked to ensure that it is in operating condition. To check the relief valve,

lift the lever at the end of the valve several times. The valve should seat

properly and operate freely.

If water does not flow, remove and inspect for obstructions or corrosion.

Replace with a new valve of the recommended size as necessary. Inspection

of the valve should be performed at least every three years. Do not attempt

to repair the valve, as this could result in improper operation and a tank

explosion. In areas with poor water conditions, it may be necessary to inspect

the T&P valve more often than every three years.

CAUTION

BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THAT A

DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE

DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION

COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT

THE VALVE DURING THIS CHECKING OPERATION.

If the temperature and pressure relief valve on the heater discharges

periodically or continuously, it may be due to thermal expansion of water in

a closed water supply system, or, it may be due to a faulty relief valve.

Thermal expansion is the normal response of water when it is heated.

In a closed system, thermal expansion will cause the system pressure

to build until the relief valve actuation pressure is equaled. Then, the

relief valve will open, allowing some water to escape, slightly lowering

the pressure.

Contact your water supplier or local plumbing inspector on how to control

this situation.

Two common corrections are listed in the Checklist and Service Information

which appears later in this manual.

ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE

RELIEF VALVE. THIS IS NOT A SOLUTION AND CAN CREATE A

HAZARDOUS SITUATION.

CIRCULATING PUMP

The water heating system may include a circulating pump. Where used, it

should be lubricated as directed by the circulator manufacturer.

VENT SYSTEM

Examine the vent system every 3 months. Points of inspection are

as follows:

1. Check for obstructions and/or deterioration of vent piping and vent hood.

Replace immediately where needed.

2. Vent pipe and vent hood screen should be cleaned of foreign material and

soot. The screen is located inside the vent hood outlet and is accessible

from the outside of the hood. Do not reach inside the vent hood when

the heater is in operation.

3. Check all vent system connections for leakage and reseal as required

using Hi Temp Silicone sealer or equivalent.

This manual is related to the following products: