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The diagram below shows the position for terminal blocks in the controller main board which are used for
thermostat control and BMS system. Beside that, the output pins for auxilliary electrical heater are shown as well.
Thermostat Control (TB_THM-l)
Connect to
third party
controller
BMS System (TB_BMS-l)
Connect to
BMS
System
(iv) Auxilliary Electrical Heater Output (HTR1 and HTR2)
ü
There are two output pins (HTR1 and HTR2) on controller main board, which are used to energize the heater
contactor. The contactor must be selected accordingly to avoid any safety issue(s).
ü
The heater shall be installed in accordance with local and national legislation. It must comply with EN60335-2-40.
ü
Thermal fuse(s) shall be installed on the heater to eliminate any danger or damage on the heater/unit. This is
especially critical when there is any malfunction happen to controller main board or blower.
ü
The heater shall be in a safe location, whereby no risk of damage could be happen on the unit.
ü
Use non-flammable duct for the unit that is installed with heater
ü
Use different power supply for electrical heater and install a circuit breaker for each of the heater.
ü
Maximum temperature in the unit must not exceed 60°C. Temperature measurement shall be taken during the
installation or commisioning in order to ensure the temperature not exceed this value.
ü
Select the proper safety device or thermal protector accordingly.
ü
The heater shall never be installed inside the unit. The recommended location for the heater is inside the supply
duct, whereby the distance of the heater is sufficient to ensure the temperature inside the unit does not exceed
60°C.
(v) Economizer control
ü
Ensure the economizer kit has been incorporated with rooftop unit before activate the economizer function in
the controller main board. Else, error will occur.
ü
To activate economizer function, set Dip Switch Setting: SW4 - ON (default is OFF) in the controller main board
and panel parameter G6 to '1' (default is '0').
G6 = Economizer control
0 = disable
1 = enable.
ü
In economizer controller board, there are 4 dip switches and 3 shunt jumpers which provide flexible selection
based on different requirements:
– Dip Switch 1: Minimum fresh air opening setting in heating mode, where by the selection of different pins will
give different opening setting. SW1: 5%, SW2: 10%, SW3: 15%, SW4: 20%, SW5: 25%, SW6/7/8:
no function, Default: 0% (no selection, all OFF).
– Dip Switch 2: Minimum fresh air opening setting in cooling mode, where by the selection of different pins will
give different opening setting. SW1: 0%, SW2: 5%, SW3: 15%, SW4: 20%, SW5: 25%, SW6/7/8:
no function, Default: 10% (no selection, all OFF).
– Dip Switch 3: CO
2
value setting. SW1: 25%, SW2: 50%, SW3: 75%, SW4: 100%, Default: 0% (no selection, all OFF).
– Dip Switch 4: Type of operation, which include the following selection:-
SW1: OFF = Differential temperature operation (default), ON = No function at this moment.
SW2: OFF = Economizer mode (default), ON = Fresh air mode.
SW3: OFF = Overcooled protection is activated (default), ON = Overcooled protection is not
PPM level threshold value selection, where by the selection of different pins will give different
activated.
Dry Contact Outputs (TB_BMS-O)
Defrost
Alarm
Output
Output
signal
output
(AL)
1 (O1)
2 (O2)
(DFRT)
Controller Main Board
Heater Output (HTR1 and HTR2)
Connect to
Connect to
heater
heater
contactor
contactor
ON
OFF
1
2
3
4
5
6
7
8
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