Wiring
• Deactivate the 24 Vac/dc power supply until all connections are made to the device to prevent electrical shock or
equipment damage.
• Use 14-22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with
wiring used to supply inductive loads such as motors. Make all connections in accordance with national and local
codes.
• The temperature thermostat comes with the temperature sensor pre-wired to the PCB. If removal is required for
installation then it may be re-wired as shown in Figure 11.
• Pull at least six inches of control wire into the enclosure, then complete the wiring connection according to the
wire diagram for the applicable power supply as shown in Figure 12.
• Connect the DC positive or the AC voltage hot side to the PWR terminal. The supply common is connected to the
COM terminal. See Figure 12.
•The relay has both Normally Open (NO) and Normally Closed (NC) contacts available. The relay output is available
on the NO/COM/NC terminal. Make connections before applying power as shown in Figure 13.
• The setpoint differential has 3 jumper selectable settings (Low/Mid/High) Set jumper to desired differential as
shown in Figure 14.
• To set the switching setpoint, turn the setpoint potentiometer to the desired temperature setting as shown in
Figure 15.
• Once all connections settings are made and checked, power can be applied.
Greystone Energy Systems, Inc. 150 English Drive, Moncton, NB E1E 4G7 Canada Tel: +1-506-853-3057 Tollfree (North America): +1-800-561-5611 Fax: +1-506-853-6014
Email: support@greystoneenergy.com Web: www.greystoneenergy.com
Temperature
Sensor
DIFFERENTIAL
HIGH
LOW MID
TEMP
PWR
COM
NC
NO
COM
SETPOINT
Temperature sensor wiring to PCB
(Factory Wired)
Figure 11
No Polarity
TEMP
Figure 12
24 Vdc Power Supply
Power Supply Wiring
DIFFERENTIAL
HIGH
LOW
MID
HIGH - 5.6C/10F
MID = 2.8C/5F
LOW = 1.1C/2F
Figure 14
Figure 15
Setpoint Adjustment
Setpoint Differential Setting
Specification:
Power Supply.......................12 to 28 Vac/dc
Consumption.......................50 mA max
Relay Contacts.....................SPDT, Form C contacts (N.O. and N.C.)
5 Amps @ 30 Vdc/250 Vac resistive
1.5 Amps @ 30 Vdc/250 Vac inductive
Relay Action..........................Activates on temperature fall
Setpoint Operation............Single-turn knob-pot on pcb
Adjustable Setpoint...........-4 to 10˚C (25 to 50˚F)
Setpoint Temperature ......Low/Mid/High jumper selectable
Differential 1.1/2.8/5.6 °C (2/5/10 ˚F)
Temperature Sensor..........10K ohm curve matched
precision thermistor
Sensor Accuracy..................±0.2˚C, 0 to 70˚C (±0.36˚F, 32 to 158˚F)
Probe Sensing Range ........-20 to 105 ˚C (-4 to 221 ˚F)
Probe Material ................ ....Aluminum plate
w/ compressible foam backing
Probe Diameter......... ..........38 mm (1.5”) square
Wire Material........................PVC insulated, parallel bonded
Operating Conditions.......-10 to 50˚C (14 to 122˚F),
5 to 95% RH non-condensing
Storage Conditions............-30 to 70˚C (-22 to 158˚F),
5 to 95%RH, non-condensing
Enclosure...............................(A) ABS, UL94-5VB, IP61 (NEMA 2)
(D)-ABS, UL94-5VB, IP65 (NEMA 4X)
Wiring Connections...........Screw terminal block
(14 to 22 AWG)
24 Vdc Power Supply
NO
NC
Digital
Input
NO
NC
Figure 13
Relay Output Wiring
