Specifications

Stellar Service Instructions REV: D
Date of Issue: 14/09/2007
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”.
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MAGNETIC VALVE
A solenoid type gas isolating valve held in the open position by a small electric current generated by the
thermocouple. This valve will completely isolate the supply of gas to the burner in the event of a pilot flame failure.
THERMAL SWITCH
A one-shot safety device mounted in the thermocouple near the gas control that senses excessive heat outside the
combustion chamber. This device cannot be reset.
INLET DIFFUSER
A device installed in the cold water inlet of the water heater to help control temperature stratification within the
cylinder.
ANODE (SACRIFICAL)
A metal alloy electrode that, by galvanic action, protects the inner cylinder from corrosion.
TEMPERATURE AND PRESSURE RELIEF VALVE (T&PR)
A valve designed to provide automatic relief by discharging water in case of excessive temperature, pressure or both.
Never fit a T&PR Valve with a pressure rating greater than that indicated on the product rating label.
DELIVERY TUBE (DIP TUBE)
A polypropylene tube fitted inside the water heater cylinder to conduct water from the highest point to the outlet
connection. It also acts as a fitting liner.
FLUE BAFFLE
A baffle inserted into the water heater flue tube that slows the passage of flue gases to ensure maximum heat
transfer to the stored water.
COMMON FAULTS
When a complaint is lodged about the performance of a hot water system there are a number of causes that should
be checked and eliminated. In an attempt to pinpoint the most likely cause it is important to discuss with the customer
their reasons for the complaint, the duration of the problem, any change in circumstances or usage and recent
weather conditions.
This information in conjunction with the following listed common complaints will assist you in locating the most likely
cause. All procedures assume there is water flowing through the water heater.
Excessive hot water usage
The complaints of insufficient hot water and no hot water can on many occasions be attributed to hot water usage
exceeding the capacity of the water heater to provide hot water.
When first attending a call of this nature it is essential to establish the probable hot water usage by querying the
usage habits of the household and compare this with the potential delivery of the model water heater installed. It can
then be established if the usage is within or outside the capacity of the model. The areas to look at for excessive
usage are:
1. Automatic washing machines.
2. Showers exceeding 11 litres/minute for mixed water and 5 minutes in duration.
3. Two or more showers operating at the same time.
4. Change of occupancy or number of persons increased.
5. High water pressure area. (Excessive T&PR discharge)
6. Plumbing leaks