6 18-HD66D1-4
Preparation
Mount Panel
Section 3. Installation
The unit’s rugged design allows installation in closet, attic or other non-condensing locations free from
obstructions or other hazards.
Remove cover by grasping at edges and gently
pulling the cover straight towards you. It should
release without much effort.
Mark four holes on the wall using the base as a
template. A level may be used to ensure accuracy.
Mounting to studs: Drill 1/8” pilot holes in the four
locations marked above.
Mounting to drywall:
If mounting to drywall with no studs behind it,
enlarge pilot holes to 3/16” for anchors (included
with the control).
Gently tap anchors into the holes.
Attach base to wall using four screws provided.
Do not overtighten.
1/8” for screws
into studs
3/16” for drywall
anchors
DRILL HOLES
1A
1B
Zone Dampers
Sensors
Reserved
Reserved
Reserved
Static Press
Gnd/Grn
Signal/Blk
+5V/Red
Temperature
Non Comm Zone Sensor
Discharge Air
Discharge Air
Return Air
Return Air
Mixed Air
Mixed Air
Zone 1 or 5
Zone 1 or 5
Zone 2 or 6
Zone 2 or 6
Zone 3 or 7
Zone 3 or 7
Zone 4 or 8
Zone 4 or 8
Zone
1 or 5
I
n
door/
Relay Panel
Comm
Outdoor
Comm Zone Sensor/
2nd Zone Panel
24V
Trans.
Common
PO/Open
PC/Closed
Zone
2 or 6
Common
PO/Open
PC/Closed
Zone
3 or 7
Common
PO/Open
PC/Closed
Zone
4 or 8
Common
PO/Open
PC/Closed
Comm
R
BD B
B
R
BD
D
Zone Dampers
Sensors
Reserved
Reserved
Reserved
Static Press
Gnd/Grn
Signal/Blk
+5V/Red
Temperature
Non Comm Zone Sensor
Discharge Air
Discharge Air
Return Air
Return Air
Mixed Air
Mixed Air
Zone 1 or 5
Zone 1 or 5
Zone 2 or 6
Zone 2 or 6
Zone 3 or 7
Zone 3 or 7
Zone 4 or 8
Zone 4 or 8
Zone
1 or 5
Indoor/
Relay Panel
Outdoor
Comm Zone Sensor/
2nd Zone Panel
24V
Trans.
Common
PO/Open
PC/Closed
Zone
2 or 6
Common
PO/Open
PC/Closed
Zone
3 or 7
Common
PO/Open
PC/Closed
Zone
4 or 8
Common
PO/Open
PC/Closed
Comm
R
BD B
B
R
BD
D
Zone Dampers
Sensors
Reserved
Reserved
Reserved
Static Press
Gnd/Grn
Signal/Blk
+5V/Red
Temperature
Non Comm Zone Sensor
Discharge Air
Discharge Air
Return Air
Return Air
Mixed Air
Mixed Air
Zone 1 or 5
Zone 1 or 5
Zone 2 or 6
Zone 2 or 6
Zone 3 or 7
Zone 3 or 7
Zone 4 or 8
Zone 4 or 8
Zone
1 or 5
Indoor/
Relay Panel
Comm
Outdoor
Comm Zone Sensor/
2nd Zone Panel
24V
Trans.
Common
PO/Open
PC/Closed
Zone
2 or 6
Common
PO/Open
PC/Closed
Zone
3 or 7
Common
PO/Open
PC/Closed
Zone
4 or 8
Common
PO/Open
PC/Closed
Comm
R
BD B
B
R
BD
D