© CUB CAMPERS • H16 OWNER’S MANUAL • REVISION 1 – 31/10/2023 PAGE 30 of 53
COOLANT LINE BLEEDING
1. Ensure all coolant lines & connections are secure & properly sealed.
2. Where ball valves are fitted for the air heater, ensure they are open.
3. Fill the 15L buffer tank with coolant mixture; 2 parts glycol to 1 part water (10L Glycol,
5L Water). Use standard glycol sold at any auto parts retailer. Fill to the underside of
filler neck.
4. Check system for any leaks.
5. Keep radiator cap off.
6. Where the ball valves are fitted for the air heater, ensure these are now closed/shut.
7. Now open the bleed valve by screwing the brass bleed screw anti-clockwise, NOTE do
not remove the bleed screw completely.
8. Now turn the diesel hot water service on.
9. Where fitted with ball valves, slowly open the supply valve, and then slowly open the
return valve.
10. Keep a watch on the bleed valve, after some time it should stop venting air bubbles
and a small flow of coolant will be present, at this time close the bleed valve, turn
clockwise until tight.
WARNING: The coolant & tank may be hot, please take all necessary precautions to avoid
scalding or injury.
11. Allow the heater to operate for 2-3 more minutes ensuring no problems occur
regarding the coolant circulation pump.
12. Turn off heater and allow system to cool.
13. Check coolant level & top up if necessary, fit radiator cap.
14. Check for any leaks & rectify.
FUEL LINE BLEEDING
Turn the heater on and with the start up sequence, the process of the fuel pump will operate.
During this operation, fuel will be delivered to the heater. Depending on the length of the fuel
line, this may take a few attempts. During the process the heater will try to start twice and if
the fuel has not been delivered, it will enter fault mode. You will need to reset the heater by
following the reset procedure in the manual.
HEATER OPERATION
The heater is designed to turn on via the controller and is thermostatically controlled. The
coolant circulation pump, and combustion air fan starts operation and after approx. 60
seconds combustion starts with an audible sound. After the coolant has reach the set point of
80°C the heater will automatically adjust its heat output to a lower operation range. When the
temperature of the coolant continues to rise and climb to 90°C at the heater outlet, the heater
will cycle off. When the coolant temperature falls below 70°C the heater will restart and
repeat the heating cycle. On initial start-up it will take approx. 15-20 mins to heat the coolant
to around 90°C
Turn the cabin heater onto high fan speed and the cabin heater will produce 60°C of hot air
from the heat of the coolant.
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