tekmar 003 Relay - Manual (Page 3)

3 of 4 © 2011 D 003 - 05/11
120 V (ac) Power Supply
L
N
24 V (ac)
Power
Supply
R
3
4
6
5
7
2
1
8
R
C
C
2
1
t
a
e
H
m
e
D
t
a
e
H
m
e
D
120 V (ac)
Pump
ON
Thermostat
CLOSED
Relay
POWERED
24 V (ac) Power Supply from
a Different Transformer
24 V (ac) Heat Demand
Signal ON
Thermostat on and calling for heat.
120 V (ac) Power Supply
L
N
24 V (ac)
Power
Supply
R
3
4
6
5
7
2
1
8
24V (ac) Power Supply from
a Different Transformer
R
C
C
24 V (ac) Heat Demand
Signal OFF
12
Heat Dem
Heat Dem
120 V (ac)
Pump
OFF
Relay
UNPOWERED
Thermostat
OPEN
Thermostat off and not calling for heat.
Low voltage thermostat energizes Relay 003 to turn on a 120 V (ac) zone pump. A
heat demand is sent to a tekmar control.
Application
The red LED indicator turns on when
the relay coil is energized. This LED is
visible as indicated through the top of
the relay and provides visual verification
when the relay is “on”. When the relay
coil is “off” the LED will also be off.
Push the test button on the front side
of the relay to manually close the N.O.
(Normally Open) contacts and open
the N.C. (Normally Closed) contacts for
testing purposes.
Test Button
Red LED
Testing