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TEMPERATURE RISE
The correct temperature rise across the water heater heat exchanger is the result of correct pump
selection and speed, pipe sizing (refer to the section on 'Pump Selection' on page 13and good
plumbing.
The typical temperature rises for most applications will be between 10°C and 20°C.
A temperature rise of less than 10°C is indicative of excessive flow rate that can lead to erosion of the
tube bundle and/or headers. A temperature rise greater than 25°C indicates insufficient water flow
which can lead to warpage of the tube bundle and nuisance tripping of the high limit thermostat.
Damaged to the water heater caused by insufficient or excessive temperature rise across the heat
exchange is not covered by warranty.
FLOW SWITCH
The adjustment screw alters the amount of pressure or
flow required to activate the micro-switch. To adjust the
setting:
1. Loosen the locknut
2. Turn the screw clockwise to decrease the amount of
flow required to operate the micro-switch or
anticlockwise to increase the amount of flow required
to operate the micro-switch
3. Tighten the locknut
HIGH LIMIT
The high limit thermostat senses the water temperature leaving the heat
exchanger and is typically set approximately 15°C above the controlling
thermostat 'set' point however for high temperature applications the setting
must not exceed
•
85°C for installations utilizing storage tanks
•
90°C for all other installations
To adjust the limit temperature:
1. Remove the front cover
2. Loosen the lock screw
3. Turn the dial until the required temperature is adjacent to the pointer
4. Tighten the lock screw
5. Refit the front cover
ADJUSTMENT
Lock Screw
34
Adjustment Screw
Pointer
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