COMMISSIONING
HCV & HCVR Evaporative Cooling & Gas Heating
Page 17 of 26
T
EMPERATURE
C
ONTROL
Refer ADDENDUM for modulation operation. Based on standard Unit
HIGH LIMIT
If the high limit does trip the cause should be sought and rectified as this is not a normal operating
function. The high limit control also contains another switch which functions to allow the fan to run on or
restart when unit is turned “OFF” at the selector switch. This occurs to remove residual heat and to prevent
the high limits from locking out.
The fan switch should be set to start the fan at 60°C and cut it out at 32°C. Discharge dampers located at
the outlet of the heating section are controlled by a two position damper motor which is fitted and wired as
an integral part of the unit. The dampers closed position may be varied by adjusting the linkages. This is
done to provide the air quantity or temperature rise required for heating.
NOTE:
Temperature rise must be between 11°C and 33°C.
On “High Cool” and “High Vent” dampers must be in the fully open position. On “Heat” setting dampers
travel to provide design temperature rise against air change rate required. The dampers will travel to this
position for “Low Cool” and “Low Vent”
If temperature rise or air change rate is not specified, set dampers to provided 22°C temperature rise.
IMPORTANT: If heater will not operate after carrying out instructions as detailed above contact Aira Pty L