5
When a zone has a
demand from a thermostat
(TT or R W) the relay will
close sending 120 VAC
to Relay #1 NO terminal
and switching the pump
on, and the C to NO dry
contact on relay #2 closes,
signaling the boiler of a heating demand.
1 Zone
ZSR101
C
R
W
T
T
COM
L
POWER IN
N
C
RELAY #1
NO NC
C
RELAY #2
NO NC
TRANSFORMER
PWR
ZONE
1 Zone
ZSR101
C
R
W
T
T
COM
L
POWER IN
N
C
RELAY #1
NO NC
C
RELAY #2
NO NC
TRANSFORMER
PWR
ZONE
Operating Principles
R, W, C and T T Comm dual labeling at thermostat terminals.
Compatible with low voltage 2, 3, or 4 wire thermostats or any
other low voltage devices having a switching action.
Supply 120 VAC hot to terminal L and 120 VAC neutral to N.
A factory installed jumper from L terminal to the C terminal of
Relay 1 is supplied for simplifi ed pump connection.
Dual labeled T-stat terminals.
Compatible with 2, 3 and 4
wire T-stats.
Replaceable fuses.
6 VA Transformer.
Keyhole mounting
which fits a 4X4
junction box.
Pre-installed jumper.
Rear knockout for
4X4 junction box.
If dry contacts are desired from relay #1, remove the factory
installed jumper between L and C.
Cover removal
Hold either the left or the right end
of the box up and at an angle. Use
body for stabilizing relay box. Insert
screwdriver and push tab inward.
Turn box and repeat inserting
screwdriver and pushin tab inward on
opposite side, cover should release
from base.
Slide cover off base.
Mounting
: Do not mount to a
surface that exceeds 115°F (45°C).
The unit must be only located in dry
interior locations. Use only copper
conductor supply wire suitable for
at least 105° C. All circuits must
have a common disconnect and
be connected to the same pole of
the disconnect. It is not suitable for
installation in hazardous locations.
120VAC input
power connection
