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11

10

WIRING

Disconnect power to the HVAC system to prevent electrical shorts while wiring . 

1. 

Run a 2-conductor cable from the control to the outdoor temperature sensor (if installed) and 
wire to the controller ODT terminals .

2. 

Run an 8-conductor thermostat cable from the control to the HVAC equipment . Wire the 
controller to the HVAC equipment in accordance with 

FIGURE 1

 or 

FIGURE 2

 diagram below . 

Contact customer service if wiring assistance is needed for other equipment configurations .

3. 

Run a 2-conductor cable from the control to either the damper in Model 8126X installations or 
to the Model 8140NC Fresh Air Ventilator and wire according to 

FIGURE 3

 or 

FIGURE 4

 .

MODEL 8120X DIGITAL VENTILATION CONTROL

R

C

Y

W

G

R

C

Y

W

G

THERMOSTAT

WIRE NUT

(FIELD

SUPPLIED)

R
C
Y

W

O

GS

GH

FURNACE

R & C = 24 VAC

Y = COOLING

W = HEAT

GS = FAN INPUT

GH = FAN OUTPUT

VENT

ODT

OUTDOOR

TEMPERATURE

SENSOR

FIGURE 1 

– WIRING TO FURNACE

MODEL 8120X DIGITAL VENTILATION CONTROL

R C Y W1

G

R C Y W

G

HEAT PUMP THERMOSTAT

WIRE NUT

(FIELD

SUPPLIED)

O

R & C = 24 VAC

Y = COMPRESSOR

W1 = 1st STAGE AUX. HEAT

O = REV. VALVE, COOLING

GS = FAN INPUT

GH = FAN OUTPUT

R

C
Y

W

O

GS

GH

VENT

ODT

HEAT PUMP

O

OUTDOOR

TEMPERATURE

SENSOR

MODEL 8140NC

VENTILATOR

VENT

VENT

FIGURE 2 

– WIRING TO HEAT PUMP

FIGURE 3 

– WIRING TO MODEL 8140NC FRESH AIR VENTILATOR

Summary of Contents for 8126

Page 1: ...MIN HR CODE READ AND SAVE THESE INSTRUCTIONS Model 8120X Digital Ventilation Controller Installation and Operation Manual ...

Page 2: ...Sequence of Operation Comfort Setting 19 Limited Warranty 20 WARNINGS AND CAUTIONS WARNING 120 volts can cause serious injury from electric shock Disconnect electrical power to the HVAC system before proceeding Sharp metal edges can cause serious injury from cuts Use gloves when cutting openings in sheet metal NOTICE When installing the Ventilation Controller on downflow furnaces ensure that the f...

Page 3: ...ntilation with high indoor RH is important mount the control to the return duct and mount the outdoor temperature sensor as shown on pages 6 9 If humidity limits will not be used then the control can be mounted to the housing of the Model 8140NC and the outdoor temperature sensor does not need to be installed 1 Remove the wall plate from the control and put the rest of the control in a safe locati...

Page 4: ...CT WALL PLATE 8 HEX HEAD SCREWS 5 8 DIA HOLE PILOT HOLES FOR SCREWS 6 MIN 90 2269 Duct Board Installation 1 Take out the duct board mounting bracket remove the wall plate from the control and put the rest of the control in a safe location until after wiring is completed 2 Cut a 5 75 x 5 25 rectangular opening in the return plenum Save the piece cut out to insulate the duct board bracket around the...

Page 5: ... rest of the control in a safe location until after wiring is complete 2 Use spacers or brackets to mount the controller to an inside wall surface or return plenum duct surface that is at room temperature i e do not mount to supply ductwork or to the air handler furnace to space the wall bracket a minimum of away from the surface 3 Mount the wall bracket to the surface using 8 screws field supplie...

Page 6: ...e damper in Model 8126X installations or to the Model 8140NC Fresh Air Ventilator and wire according to FIGURE 3 or FIGURE 4 MODEL 8120X DIGITAL VENTILATION CONTROL R C Y W G R C Y W G THERMOSTAT WIRE NUT FIELD SUPPLIED R C Y W O GS GH FURNACE R C 24 VAC Y COOLING W HEAT GS FAN INPUT GH FAN OUTPUT VENT ODT OUTDOOR TEMPERATURE SENSOR FIGURE 1 WIRING TO FURNACE MODEL 8120X DIGITAL VENTILATION CONTRO...

Page 7: ...0 2266 OPERATION The display will appear faint normally the first press of any button will turn on the display at full power Use for Rater Inspector Verification Press and hold for 5 seconds to enter Test Mode or Set Up Menu Lights green when ventilating Shows the ventilation time setting minutes hr mode of operation Code or Comfort and whether the HVAC fan has been turned on when ventilating Use ...

Page 8: ...irflow delivered during ventilation HP F CODE NO OF BEDROOMS HIGH OFF 85 F 105 F Ventilation high temperature limit Ventilation is limited when the outdoor temperature exceeds the setting Turn OFF if no high limit is desired HP F COMFORT HOUSE FT2 LOW OFF 10 F 40 F Ventilation low temperature limit Ventilation is limited when the outdoor temperature falls below the setting Turn OFF if no low limit...

Page 9: ...ops below the setting ventilation will not occur When all Set Up Menu options have been entered the control will display donE TEST MODE After wiring and set up have been completed Test Mode can be used to verify that all components in the ventilation system function and that wiring to the HVAC system fan is correct 2 3 Test Sequence Description HP F HC Shows outdoor temperature as measured by the ...

Page 10: ... starts again it will sample the air temperature and if in range will meet the set amount of ventilation during the four hour cycle period For example if the Vent Time was set to 25 minutes per hour and the air temperature fell below the low limit setting ventilation would only occur during a heating call If the heating only operated for 10 minutes during the hour the control will automatically ch...

Page 11: ...ESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED THIS LIMITED WARRANTY IS VOID IF DEFECT S RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INS...

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