CALEFFI Z-one ZVR10 Series Manual page 13

Operating Principles
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.
R, W, C and T T Comm dual labeling at thermostat terminals.
Compatible with low voltage 2, 3, or 4 wire thermostats or any
TRANSFORMER
TRANSFORMER 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.
POWER IN RELAY #1
C NO NC
N L
POWER IN RELAY #1
C
If dry contacts are desired from relay #1, remove the factory N L
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.
R W C
T T COM
R W C
T T COM
PWR
ZSR101
ZSR101
ZONE
1 Zone
1 Zone
RELAY #2
C NO NC
RELAY #2
NO NC C NO NC
Turn box and repeat inserting
screwdriver and pushin tab inward on
opposite side, cover should release
from base.
Dual labeled T-stat terminals.
Compatible with 2, 3 and 4
6 VA Transformer.
PWR
ZONE
120VAC input
power connection
Keyhole mounting
which fits a 4X4
junction box.
Pre-installed jumper.
Slide cover off base.
Replaceable fuses.
wire T-stats.
Rear knockout for
4X4 junction box.
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.
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