9�3 Ku4 & Ku5 Commissioning Instructions; 9�3�1 Initial Ignition And Gas Inlet Pressure Check; 9�3�2 Heater Fan Speed And Temperature Settings - Kaden KU5 Installer Manual

Kaden Installer's Manual
Ducted Gas Heaters
9.3 KU4 & KU5 COMMISSIONING INSTRUCTIONS
With a correctly designed and installed ducted system, generally, the balancing damper in an outlet should be
initially set as follows:
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Living areas 100% open
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Bedrooms 50% open
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Bathrooms, ensuite & Laundry: 25% open
9.3.1 Initial Ignition and Gas Inlet Pressure Check
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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.
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Go to the wall control 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 LCD display image right 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 (wall control 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 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.
THE GAS VALVE SHOULD NOT BE ADJUSTED UNDER ANY CIRCUMSTANCES.
IMPORTANT
If everything seems to be functioning correctly up to this point, please continue on with the commissioning
procedure. KU4 & KU5 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 Owner's manual).
9.3.2 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 wall control 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.
•
For new system installations (not changeovers) 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.
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