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Kaden Installer's Manual
Ducted Gas Heaters
10. COMMISSIONING KUN3, KEX3 & KEX4
10.1 COMMISSIONING INSTRUCTIONS
With a correctly designed and installed ducted system, generally the balancing damper in an outlet register should
be initially set as follows:
•
Living areas: 100% open
•
Bedrooms: 50% open
•
Bathrooms, ensuite & Laundry: 25% open
10.1.1 Start & Check Supply Pressure
1.
Turn OFF the 240 Volt AC power supply at the fixed switched socket outlet adjacent to the unit.
2.
Ensure the gas cock adjacent to the heater is in the OFF position.
3.
Locate gas valve inlet pressure test point, remove the grub screw and insert your test point fitting (hose tail
1/8" NPT).
4.
Attach a manometer to the test point.
5.
Ensure that all air has been purged from the gas piping and then turn ON the gas cock adjacent to the unit.
6.
Turn on the 240 Volt AC power supply adjacent to the unit.
7.
Go to the wall control, turn it ON and increase the temperature setting so that it calls for heat.
8.
The unit will now attempt to ignite.
9.
Once the ignition is successful allow the unit to run for one minute, ensuring the gas supply pressure does not
fall to below 1.1kPa while other gas appliances are operating at their full capacity.
10. If the reading is below 1.1kPa, then the incoming gas supply is inadequate (check supply pipe for blockage,
and check pipe sizing and gas meter sizing).
11. Turn the unit OFF at the wall control, isolate the gas and the 240 Volt power supply adjacent to the unit.
12. Remove and replace test point with the grub screw.
If the unit does not ignite on the first attempt it may be a result of all air not being purged from the
gas supply line. The heater will attempt to ignite up to five times before locking out, after which
IMPORTANT
it will require a power reset.
If the heater does not attempt ignition at all:
•
Check the Lighting Procedure again and if it still fails to light, by-pass the wall control by removing cables from
the terminal block at the unit and link (bridge) terminals "R" and "W". If it then lights, there is a fault with the wires
to the wall control or in the wall control itself. If it does not light, check the overheat switch has not tripped or the
2 amp fuse has not blown.
10.1.2 Start & Check Burner Pressure
1.
Repeat steps 1 to 7 in Section 9.2. For step 3 relocate the test point fitting from the inlet pressure test point to
the burner pressure test point on the gas valve, or if fitted use the test point on the manifold.
2.
Take a manometer reading of the test point pressure and confirm it is equal to the figure shown on the
appliance data label. If the pressure reading is not correct, adjust the gas valve pressure regulator either up or
down to match the required test point pressure. If the pressure is lower than the required amount and cannot
be adjusted any higher, this indicates that the incoming supply pressure is not sufficient (check supply pipe
for blockage, and check pipe and gas meter sizing).
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