tekmar 521 Programmable Thermostat Installation - Manual (Page 10)

© 2014 521_D - 01/14
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 G G Rh W1 S1 S2 Com
No Power
2
1
8
7 3
4
5
6
Thermostat Wiring
Boiler
Relay
003
Pump
Transformer
tN4 C W R
C R Y/W2 Rc G G Rh W1 S1 S2 Com
No Power
Wiring Center
C R Y/W2 Rc G G Rh W1 S1 S2 Com
No Power
R W
24 V
R W
H N X X H N H N N H
Com Switching Relay
Zone 1 Zone 2 Zone 3
Class 2
Transformer
R W
Zone 1 Zone 2 Zone 3
Pump N L
Field Jumper Required:
R to Rh
Field Jumper Required:
R to Rh