Lennox SCA 010 Installation, Operation & Maintenance Manual page 57

USING THE T7300 THERMOS USING THE T7300 THERMOS USING THE T7300 THERMOST T T T T A A A A A T T T T T USING THE T7300 THERMOS USING THE T7300 THERMOS
Mounting Subbase
The subbase or wallplate may be installed horizontally on
the wall or a 2 in. x 4 in. wiring box. Position the subbase or
wallplate horizontally on the wall or on a 50.8. x 101,6 mm
wiring box.
1. Position and level the subbase (for appearance only).
The thermostat operates properly even when not level.
2. Use a pencil to mark the mounting holes. See figure
67.
3. Remove the subbase from the wall and drill two 3/16
inch holes in the wall (if drywall) as marked.
For firmer material such as plaster or wood, drill two 7/
32 inch holes. Gently tap anchors (provided) into the
drilled holes until flush with the wall.
4. Position the subbase over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
Wiring subbase
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring
instructions when available.
Refer to below table for terminal designations.
CAUTION
Electrical Shock Hazard.
Power supply can cause electrical shock.
Disconnect power before beginning installation.
TERMINAL DESIGNATION AND DESCRIPTIONS
Standard terminal
designations
A1
A2
A3
AS, AS
B
E
G
O
a : Some OEM models reverse the economiser terminal designation A1 and A2
Page 56 - IOM / Rooftop Smart and Linéa™ Range
Alternate terminal
Typical connection
designations
Dry auxiliary contacts for economizer
control; A1 is normally open during
a
A2
Unoccupied periods and closed during
Occupied periods.
Dry auxiliary contacts for economiser
a
A1
control (A2 is common)
Dry auxiliary contacts for economizer
control; A3 is normally open during
-
Occupied periods and closed during
Unoccupied periods.
- Discharge air sensor connection
- Heating changeover valve
K Emergency heat relay
F Fan relay
R Cooling changeover valve
MOUNTING SUBBASE OR WALLPLATE
Wires through wall
Wall anchors (2)
LEDS
Function
Output
Input
Output
Input
Output
Output
Output
Output
WALL
Mounting
holes
Mounting
screws
Figure 67
Terminal type
Dry contact
Dry contact
Dry contact
-
24V powered contact
24V powered contact
24V powered contact
24V powered contact