Tekmar 521 Installation & Operation Manual page 10

Thermostat Wiring
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Relay 003
T T
Boiler
L
N
Wiring Center 315 or 316
Switching Relay
24 V
Com
Class 2
X X
Transformer
Pump
A Watts Water Technologies Company
2
3
4 1
8
5
6 7
Relay
003
Pump
Transformer
- - - - ----- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ----- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
tN4 C R
Wiring Center
- ---- - - ---- - - - - - --- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ---- - - ---- - - - - - --- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
R W R W R W
Zone 1 Zone 2 Zone 3
Switching Relay
Zone 1 Zone 2 Zone 3
H N H N H N
N L
Field Jumper Required:
R to Rh
C R Rh W1
R C
Field Jumper Required:
R to Rh
C R Rh W1
W
C R Rh W1
N H
10 of 28
No Power
Y/W2 Rc G G S1 S2
Com
No Power
Y/W2 Rc G G S1 S2
Com
No Power
Y/W2 Rc G G S1 S2
Com
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