15
OPERATION AND MAINTENANCE
INITIAL START-UP
THE “DO’S AND DON’TS” PAGES ARE AN INTEGRAL PART
OF THE INSTALLATION INSTRUCTIONS. IT MUST BE READ
AND
THOROUGHLY
UNDERSTOOD
PRIOR
TO
ATTEMPTING TO INSTALL CAH AIR HANDLERS
Prior to start-up, inspect the blower to confirm the blower wheel turns
freely without interfering with the housing. Replace the service access
panel.
Note: The service access panel must be in place for the unit to operate
due to the “door switch”, which interrupts the power supply when the
access panel is not in place.
WARNING
To prevent pump damage, the air handler should not be operated
in heating mode until the user supplied/installed isolation valves have
been opened and the hot water coil and hot water lines have been purged
of air.
Heating Mode – Initial Operation
1.
Fill the water heater (refer to water heater instruction). Open a
domestic hot water faucet while filling the water heater to vent
the air. When the tank is full and all of the air is purged close the
faucet.
2.
Ignite the water heater (see water heater instructions) and set the
thermostat to 140 °F nominally, but never higher than 180 °F as
this is the maximum temperature this air handler is designed to
accommodate.
3.
Purge the air from the hot water coil and the lines. Located inside
of each CAH hot water fan coil is an air purge valve. This valve
is necessary to enable air to be evacuated from the water lines.
