Rooftop Thermostat Controller
Specification and Installation Instructions
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Terminal Identification
Terminal Description
Specifications
C Common
-
R
24Vac
22 to 26Vac 50/60Hz
W1
Heating Stage 1
Dry contact, 24Vac, 1A max, 3A in-rush
W2
Heating Stage 2
Dry contact, 24Vac, 1A max, 3A in-rush
Y1
Cooling Stage 1
Dry contact, 24Vac, 1A max, 3A in-rush
Y2
Cooling Stage 2
Dry contact, 24Vac, 1A max, 3A in-rush
G
Fan
Dry contact, 24Vac, 1A max, 3A in-rush
DI
Digital Input
Dry contact (Filter, Service or Air Flow Switch)
TS
External Control Temperature Sensor Input
Thermistor 10K
Ω
, Type III. Cannot be used at the same time as the internal control
sensor. Select the sensor from the thermostat menu.
C Common
-
DS
Temperature Display Sensor Input
Thermistor 10K
Ω
, Type III. This temperature input performs no control and will only
display the temperature.
PCB
We strongly recommend that all Neptronic products be wired to a separate grounded transformer and that transformer shall service only
Neptronic products. This precaution will prevent interference with, and/or possible damage to incompatible equipment.
Jumpers Description
JP2
Thermostat Mode
A&B = RUN:
The thermostat function in Operation Mode (Default)
B&C = PGM:
The thermostat is in Programming Mode
JP4
Universal Input (pin #16)
A&B = Low Limit: Must be set to this position (Thermistor 10K
Ω
, Type III) (Default)
B&C = N/A:
Not applicable
TB1
JP2
P
G
M
RUN
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
JP4
24Vac
(R)
COM
(C)
W1
A
B
C
A
B
C
Temperature
Sensor
2
W2
Y1
Y2
G
COM
Ext Temp
Display Temp
DI
DI Digital Input
(Input 13)
Filter: message only
Service: message only
Air Flow Switch: stops unit
External Control Temperature Sensor
(Input 14)
WARNING! The external control sensor cannot be
used at the same time as the internal control sensor.
Select the sensor from the thermostat menu.
Temperature Display Sensor
(Input 16)
This temperature input performs no control
and will only display the temperature.
