43
TEMPERATURE CONTROL
Warning: Hotter Water Increases The Risk Of Scald Injury.
Warning: This water heater can deliver water at temperatures which can cause scalding.
Warning: For water heating applications it is necessary and we recommend that a temperature limiting device
be fitted between the water heating system and the hot water outlets in any ablution and public areas such as
bathrooms, ensuites or public amenities, to reduce the risk of scalding. The installing plumber may have a legal
obligation to ensure the installation of this water heater meets the delivery water temperature requirements of
AS/NZS 3500.4 so that scalding water temperatures are not delivered to a bathroom, ensuite, or other ablution or
public area.
TEMPERATURE RISE
The correct temperature rise across the water heater heat exchanger is the result of correct pump selection and
speed, pipe sizing and good plumbing (refer to “Pump Selection” on page 16)
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.
Warning: Damage to the water heater caused by insufficient or excessive temperature rise across the heat
exchange is not covered by warranty.
TEMPERATURE ADJUSTMENT – ON/OFF MODELS (IC902 ELECTRONIC THERMOSTAT)
All On/Off models are fitted with an Eliwell IC902 electronic thermostat which has the following features:
The thermostat display shows the current tank sensor temperature during normal operation.
The thermostat has parameters that control system operation. Refer to “IC902 Parameters” on page 43.
Thermostat set point, parameters, parameter options and parameter settings (or parameter information) can
be viewed or adjusted. Refer to “IC902 Adjustment Procedures” on page 44.
The „Output „ON‟ LED‟ will illuminate red whenever the thermostats internal relay is closed (call for heat).
The thermostat can be locked to prevent tampering with system status and/or level 1 parameters. Refer to
“Locking the IC902 Thermostat” on page 45.
If the thermostat detects a faulty tank sensor (an open or closed circuit tank sensor), the thermostat will show
fault code „E1‟ on the display and the alarm LED will illuminate red.
IC902 Parameters
The IC902 thermostat has parameters that control hot water system operation. Under normal conditions, including
a power outage, parameter settings do not require adjustment; however, parameter settings may be altered to „fine
tune‟ a system to suit a particular installation.
The parameter menu is comprised of a system status parameter menu and a level 1 parameter menu. The system
status parameter menu allows for quick viewing and/or adjusting of the thermostat set point (SEt), tank sensor
calibration (CA1) and actual tank sensor temperature value (Pb1) whilst the level 1 parameter menu is comprised
of four folders which contain additional parameters which are relative to the folder heading.
The following tables detail all available folders, parameters, each parameter range or option and the default
(factory) setting of each parameter. Parameters MUST be set to the grey shaded „Raypak Setting‟ column for the
hot water system to operate correctly.
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