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4. Supply Air Safety High & Low Limits
For safety reasons, the system monitors the
supply air temperature closely.
If the temperature moves outside of the limits,
all dampers in the system are forced open and
the LCD displays
‘Safety’
on screen.
The factory default supply air safety high & low
limits are 60
o
C and 5°C respectively and safety
control is disabled.
1) At the setting mode, press button until the
LCD displays the
‘H_limit’
screen.
2) Press or button to change the high
limit to the desired value. The adjustable range
of the high limit is from 45°C to 75°C.
3) Press button once again, the LCD screen will
display the
‘L_Limit’
.
4) Press or button to change the low
limit to the desired value. The adjustable range
of the low limit is from 0°C to 15°C.
If the customer does not want the safety function, the supply air
sensor is not needed to be installed. The safety H_limit and L-limit
MUST be disabled by pressing button during the setup.
5. Spill/Bypass Air Setpoint
Spill/Bypass air is primarily used to relieve duct pressure for the safety
of the ducting. Such a control is achieved by comparing the system
requirement with a setpoint. The factory default is in spill mode and the
setpoint is 30% of the total number of zones, which is equivalent to 30% of
the total airflow across the fan coil.
