8
Precautions and preparations listed are for general knowledge and to define basic guidelines. Local codes and existing practices should be observed and preformed by a professional.
Due to Ice Air’s ongoing product development programs, the information in this document is subject to change without notice.
11. AUTO Fan Speed in Different Modes
• Cooling – Auto
• High speed: when space temperature ≥ Cool set point +2°C
(4°F)
• Low speed: when Cool Set point -1°C (2°F) ≥ space
temperature ≥ Cool Set point +1°C (2°F)
• Fan stop: when compressor stop
• Electrical heater heating and others – Auto
• High speed: when space temperature ≤ Cool Set
point +2°C (4°F)
• Low speed: when Cool Set point -1°C (2°F) ≤ space
temperature ≤ Cool Set point +1°C (2°F)
• Fan stop: 10 seconds delay after the heater relay closed
• Hydronic coil heating including Hybrid/FCU – Auto
• High speed: when the P1 was detected to be closed, and,
space temperature ≤ Cool Set point +2°C (4°F)
• Low speed: when space temperature ≤ Cool Set
point -1°C (2°F)
• Fan stop: 10 seconds delay after the heater relay closed
• MODE – Auto
• Once the MODE is selected to AUTO, the fan will run in the
same manner as noted in Cooling mode page 11
Remark:
Other fan speeds like High, Medium and Low will cause no change once it
is selected.
12. Compressor Control for Cooling Mode
• Criterial for compressor ON or OFF
• Compressor ON: space temperature ≥ Cool Set point +1°C (2°F)
• Compressor OFF: space temperature ≤ Cool set point - 1°C (2°F)
Remark:
The fan status noted in the figure below only refers to the fan speed in
“Auto” fan mode.
FIGURE 4
• Compressor protection
• If the power is cycled ON, the compressor will start after 3
minutes delay, and will indicate “Starting Up…” on the main
screen and flash the Cool icon (see Figure 5); This function
can be set to valid or invalid by the dip switch J6
• The compressor always starts with a 3 minutes delay each
time it is enabled; the “Starting Up…” message is not shown
in between compressor cycles, only when being powered up
from an power OFF position
FIGURE 5
13. Heating Relay Control for Heat MODE
• Criterial for heating relay ON or OFF
• Relay ON: space temperature ≤ Cool set point - 1°C (2°F)
• Relay OFF: space temperature ≥ Cool set point +1°C (2°F)
Remark:
The fan status in Figure 6 only refers to the fan speed at AUTO fan mode
FIGURE 6
14. Anti-freeze Protection for Hydronic Heating Coil
Applications
• This function is valid only when the unit is using a hydronic coil
for heating and dip switch J3 = ON
• Trigger criterial: when the unit is ON or standing by, and, when
the ambient temperature is ≤ 40°F (5°C), the protection is
triggered. The unit will enter heat mode (heating reply is ON) and
run medium fan speed, and Figure 7 will be shown on the main
screen
• Resume criterial: when the space temperature = 60°F, the unit
go back to pervious working status
