tekmar 557 Thermostat Quick Start - Manual (Page 2)

© 2014 557_Q - 02/14 2 A Watts Water Technologies Company
3. Switch Settings (Continued)
4. Stand Alone Wiring
Switch Position Action
1
ON LOCK Access level adjustment is not available.
OFF UNLOCK Access level adjustment is available.
2 Not Used
W1 Rh1 Rh2 W2 ACC
Y2 Y1 Rc G1 O/B
S3
0-1
0
Vdc
Com
S2
S1
tN4
C
R
ACC (humidifier)
Outdoor
Sensor 070
W2 (backup heat)
R (24 V (ac) power)
C (24 V (ac) common)
Y2 (2nd stage compressor)
Y1 (1st stage compressor)
G (fan)
O/B (reversing valve)
Heat Pump
For tekmarNet ® 2 or 4 wiring, see Application Brochure 557_A or Installation &
Operation Manual 557_D.