Blue Bird Coachworks 450 LXi, Руководство пользователя

Страница: 141 / 684

4-8 Heating Systems
450 LXi Owner Manual
~ 4-8-12 ~ Rev. “C”
Check for a good fl ow through the expansion tank and double check all joints for leaks. Open and close all air vents to
eliminate any remaining air bubbles. Recheck the mixture level and circulation in the expansion tank.
CAUTION!!
Make sure you have a good, quiet circulation of water through the heater. Check the
pump to make sure it does not run dry. If the heater has air pockets trapped in the water jacket when
it is turned on, it could overheat and damage the unit. None of this is covered by warranty.
To fi ll the system use a separate self priming pressure pump with a hose on the suction side. Put the hose into a 5 gallon
container. Remove the systems hose from the outlet of the expansion tank, which is feeding the systems circulating pump
and attach it to the outlet of the self priming pressure pump. Remove the hose from the inlet of the expansion tank and hang
it into the 5 gallon container.
Make a fi nal check to ensure all of the air vents and drains are closed. Pour a mixture of antifreeze and water into the
container and start the pump. As the mixture is pumped out, slowly add more mixture keeping the level above the inlet of the
suction hose until all air has been expelled and the mixture starts coming out of the return hose hanging in the container.
This fl ushes the system of any debris and purges the lines of air. Continue to run the pump for about 15 minutes.
When no more air is being expelled, stop the pump and reconnect the lines to the expansion tank. Top off the expansion tank
with the mixture and turn on the system’s circulating pump with the jumper, located on the main control board just right of
the pump fuse, marked “Circ. Pump Override”. When the jumper is on, the pump will run continuously and the bottom LED
will be lit.
CAUTION!!
Where there is a chance of contamination of your domestic water when using a
heating system, use antifreeze specifi cally intended for hydronic heating systems. Inhibited propylene
glycol is recommended. Do not use automotive, ethylene glycol, or any undiluted or petroleum based
antifreeze as they can cause severe personal injury.
4-8.6.11 Water Filling Procedure
After your system has been completely installed, fi lled with straight water, purged of all air, and operating for a period of time
at normal operating temperatures, you should now double check all connections for leaks. If no leaks are found, the system
can be drained and fi lled with a 50/50 mixture of antifreeze and water.