4. DIP switch configuration
IMPORTANT! Before making any changes in the DIP switch disconnect power from the unit.
S1
ON
OFF
Enable Auto mode
Disable Auto mode
S2
Display set-point only
Normal temperature display
S3
Always run fan on demand*
Fan on demand - selectable
Default
OFF
OFF
OFF
*The option to always run fan on demand must be used in no valve system.
The DIP switch is located on the
side of the thermostat, next to the
T1,0 and IN1,0 terminals.
1
1
Switch
ON
Switch
OFF
5. Temperature sensors connection and logic (T1 & T2)
Important – Use only an approved NTC 50K@25
ºC
external sensor with the following characteristics.
N.TC. Sensor; Temperature ~ Resistance Characteristics
Temp °C 7.2
10.0
12.8
15.6
18.3
21.1
23.9
26.7
29.4
32.2
Res. K
Ω
115.8
100.9
88.1
77.1
67.7
59.6
52.5
46.4
41.2
36.6
Temp °F 45
50
55
60
65
70
75
80
85
90
T1 - External (Return air) sensor connection – option
T2 – Change over sensor
- Disconnect power and connect the temperature sensor to the unit (T1 to T1-0 terminals, T2 to IN1,0 terminals).
- Reconnect power.
- For T1 External sensor change technician parameter 6.15 to “E” (external sensor).
- For T2 Change over sensor change technician parameter 6.9 to “bO” and 6.10 to “EF”.
- For T1, Check the temperature readings and if needed use technician parameter 6.5 to adjust the offset for
calibration of ambient temperature.
Note: The length of the sensors cable is 100 feet (30 meters) with standard cable.
If longer distance is needed then the cable MUST be shielded.
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