IM-40MBAA-01 Specifications subject to change without notice.
19
Step 9 - Third Party Thermostat
Installation
The indoor unit has a 24V interface that provides further flexibility,
functionality and control allowing to be controlled by any 3rd party
single-stage conventional thermostat* (field supplied).
1. Run the thermostat wiring from the thermostat to the 24V interface
using connection R and C on CN15 and Y, W, G on CN19. see Fig.
2. Configure the dip switches on the 24V interface accordingly.
3. Configure the thermostat to operate as a single stage cooling and
heating (
DO NOT
configure the thermostat as Heat Pump).
*A conventional 5-wire thermostat is required.
Fig. 60 — Indoor Unit Control Box Size 24
Fig. 61 — Indoor Unit Control Box Sizes 36 - 48
LED Display
The control displays active faults codes on the LED display. When the
control displays the fault code and the LED flashes quickly, there is
something wrong with the system. Refer to the
“TROUBLESHOOTING” section for the detailed fault codes.
Temperature Sensor
The unit has one temperature sensor, which is called a Pipe
Temperature Sensor. If the temperature sensor is damaged, the system
shuts down and the LED flashes repeatedly.
Connector
Table 13 — Connector
Table 14 — Mode Setting
Table 15 — Fan Speed Setting
Fig. 62 — Cooling Only System Wiring Diagram
Fig. 63 — Cooling and Heating System Wiring
Diagram
24V Board
Main Board
Main Terminal Board
Main
Board
24V
Interface
Board
24V Transformer
Connector
Purpose
Y
Cooling
W
Heating
G
Fan-Auto Speed
AUX/DRY
Aux-Heat/Dry
Y
W
G
AUX/DRY
SETTING MODE
√
X
*
*
Cooling
X
√
*
X
Heating (without aux-heater)
X
√
*
√
Heating (with aux-heater)
X
X
√
X
Fan only
√
√
*
*
OFF
X
X
X
X
OFF
X
X
*
√
Dry
UNIT ON/OFF
G
SETTING FAN SPEED
√
X
Auto Fan Speed
√
√
Auto Fan Speed
X
X
Fan OFF
√
ON
X
OFF
*
ON or OFF
INDOOR UNIT OUTPUT WITH 24VAC 1.5A
INDOOR UNIT
THERMOSTAT
BROWN
RED
YELLOW
GREEN
INDOOR UNIT OUTPUT WITH 24VAC 1.5A
INDOOR UNIT
THERMOSTAT
BROWN
RED
YELLOW
GREEN
BLUE