4 of 24
© 2011
D 538 - 12/11
If a switch box was not used, mount the
thermostat directly to the wall.
Feed the wiring through the openings in
the back of the thermostat.
Use screws in the screw holes to fasten the
thermostat to the wall. At least one of the
screws should enter a wall stud or similar
rigid material.
•
•
Stud
2
3
/
8
”
(60 mm)
screwhole
2
3
/
8
”
(60 mm)
screwhole
Thermostat
Base
Wall
Mounted on wallboard
Thermostat Wiring
The thermostat operates a single heating system zone.
Connect tN4, C, R, and W terminals on the thermostat to the tN4, C, R, and W
terminals on the tN4 Wiring Center or Zone Manager.
Connect the optional auxiliary sensor wires to the sensor terminals 5 and 6.
1
2
3
4
tN4 Wiring Center
or
tN4 Zone Manager
Slab Sensor 072, 073, 079
OR
Outdoor Sensor 070
OR
Indoor Sensor 076, 077, 084
tN4
C
W
R
1 2 3 4
tNt 538
538
One Stage Heat
Mmm YYYY
Lo
t # 1
23
45
Mee
ts Class B:
Canadian ICES FCC P
ar
t 1
5
Power: 24 V ±10% 50/60 Hz 1.8 VA
56 VA fully loaded
Relay: 24 V (ac) 2 A
10
01
-0
3
tN4
1
C
2
R
3
W
4
6
5
Sensor
Switch Se
ttings:
For instructions see brochure
Use at least 75°C conductors
Se
tback
Scene
Lock
No
t used
ON
No
t used
Unlock
Off
Off
No P
ower
Testing the Thermostat Wiring
Testing the Power
---------------------------------------------------
---------------------------------------------------
1. Remove the front cover from the thermostat.
2. Use an electrical test meter to measure (ac) voltage between the R and C
terminals. The reading should be 24 V (ac) +/– 10%.
3. Install the front cover.
