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12.3 SP5 & SP6 COMMISSIONING INSTRUCTIONS
With a correctly designed and installed ducted system, generally, the balancing damper in an outlet should be initially
set as follows:
•
Living areas: 100% open
•
Bedrooms: 50% open
•
Bathrooms, ensuite and laundry: 25% open.
12.3.1 Initial Ignition and Gas Inlet Pressure Check
•
Attach a manometer to the inlet gas pressure test point on the gas valve (refer to label on gas valve for location)
after unscrewing the captive screw 3 full turns anti-clockwise (DO NOT remove the screw completely).
•
Ensure that all air has been purged from the gas piping, and then turn on the gas supply at the supply tap.
•
Turn on the 240 V power supply at the power point.
•
Go to the Thermostat and turn it on and temporarily set the temperature setting to maximum for commissioning
purposes (see the Owner's Manual for operating instructions). Ensure that all zones (if any) are open.
•
Go back to the heater and wait for the heating module screen to display "Heat = ##-#", which is a measure of
the supply air temperature to one decimal place (for example the diagram below shows 23.0° C).
•
You should also be able to see the burners operating; a small flame symbol will be visible on the LCD bottom
line along with the words STAT (Thermostat is calling for heat), VAC (vacuum pressure is sufficient for
combustion), and FAN (once the fan begins to operate). Note that the heater may not ignite on first attempt due
to the presence of air in the gas line. Ignition re-attempts will be repeated automatically.
•
Initially the fan will only be running at a low speed (approx 500 RPM) and then begin to ramp up to the "HEAT"
set fan speed.
•
Measure the gas inlet pressure after the heater has been operating for at least 1 minute. Ensure the gas
pressure does not fall below 1.1 kPa for NG models at all times (2.7 kPa for LPG models) while all other
gas appliances are operating at their full capacity. If the reading is below minimum figures stated
above, then the incoming gas supply is inadequate (check supply pipe for blockage, and check pipe sizing and
gas meter sizing).
•
Remove the manometer after the heater has been set up and switched off, and re-tighten the inlet gas pressure
test point screw.
Note: DO NOT adjust the gas valve under any circumstances.
If everything seems to be functioning correctly up to this point, please continue on with the commissioning procedure.
SP5 & SP6 heaters will automatically reattempt ignition a few times should the ignition process be unsuccessful
(IGN_RTRY will be displayed on the LCD), so give the heater time to rectify itself. It may simply be purging any
remaining air through the gas components. In any event, the heater will cease ignition re-attempts and lock out with
an error code if there is any problem that it can't rectify itself. If the heater does lock out with an error code, please
make a note of the code then reset the heater (see the Operation manual).
12.3.2 Heater Fan Speed and Temperature Settings
The next part of the procedure requires you to set the heating settings to suit the installation. The settings are critical
to provide adequate and efficient heating for the installation.
•
Ensure that the Thermostat is still set much higher than the actual room temperature.
•
Set the fan speed to suit the installation, adjusting it to provide sufficient but not excessive airflow. Remember,
typically the fan speed is less for floor outlet systems than for ceiling outlet systems. With down-vent type ceiling
diffusers, airflow in main living areas should be able to be felt down near floor level.
•
You should not need to adjust the thermistor set temperature. This setting should only be adjusted if the system
is NOT achieving the following temperature rise; ceiling outlets: 25º to 30º C and floor outlets: 35º to 40º C. This
temperature rise is measured from the closest outlet to the heater, minus the return air intake temperature.(i.e.
with a return air intake temperature of 20º C the temperature at the closest floor outlet to the heater should not
register more than 60º C). This temperature rise should never exceed 45º C.
Adjustments
If the desired temperature rise is too low or too high the following adjustments may be required.
Increase the room set temperature to maximum to turn the heater on and watch the thermistor temperature until it
stabilises.
Brivis
32
Ducted Gas Heater IM
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