© 2014
538_Q - 02/14
2
A Watts Water Technologies Company
4. Wiring
5. Switch Settings
Switch Position Action
1
ON
SETBACK
Allow thermostat to respond to
available schedule. Requires Timer 033.
OFF
OFF
No setback schedule response.
2
ON
SCENE
Allow thermostat to respond to
scenes. Requires User Switch 479.
OFF
OFF
No scene response.
3
ON
LOCK
Locked to ‘User’ access level. Set to
Lock when installation completed.
OFF
UNLOCK
Unlock to access all settings. Set
to Unlock during installation.
4
ON
Not used
OFF
Not used
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
01-03
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
Switch Setting Location
