Tekmar 521 - Page 10

© 2020 521_D - 12/20
10 of 28
A Watts Water Technologies Company
Wiring Center 315 or 316 -------------------------------------------- --------------------------------------------
Relay 003 ---------------------------------------------------------- ----------------------------------------------------------
Switching Relay ---------------------------------------------------- ----------------------------------------------------
T T
C
N
L
R
C R Y/W2 Rc GGRh W1 S1 S2Com
No Power
2
1
8
7
3
4
5
6
Thermostat Wiring
Boiler
Relay
003
Pump
Transformer
tN4 CW
R
C R Y/W2 Rc GGRh W1 S1 S2Com
No Power
Wiring Center
C R Y/W2 Rc GGRh W1 S1 S2Com
No Power
RW
24 V
RW
HNXX HNHN NH
Com
Switching Relay
Zone 1 Zone 2 Zone 3
Class 2
Transformer
RW
Zone 1 Zone 2 Zone 3
Pump
N L
Field Jumper Required:
R to Rh
Field Jumper Required:
R to Rh