15
Concord CXSD/H -
Installation & Servicing
INSTALLATION
16 ZONES WITH BI-DIRECTIONAL MOTORISED VALVES
IMPORTANT
Terminal L2 may control the appropriate
pump(s) directly, provided that the total
running or starting current does not exceed
6A (resistive or inductive): if this rating would
be exceeded, then appropriate switchgear
must be used to control the pumps indirectly.
Three zones are illustrated but the principles
may be extended as required, provided the
above conditions are met. Each relay will
then require as many contacts as there are
zones.
Overrun
Since any zone may be the load during
overrun, all zones MUST individually be able
to satisfy the conditions in the foregoing
paragraph. If not all zones can do this then
consider other means of control, detailed on
other sheets.
Normal operation
When any thermostat is satisfied while
others are calling for heat, power is available
15 INTERNAL WIRING
v
violet
pk
pink
y/g
yellow/green
or
orange
y
yellow
w
white
br
brown
r
red
b
blue
bk
black
At the start of the next call for heat (or the next clock period)
valves on zones not calling for heat will motor shut.
Water circulation system - refer to page 4
via relay contacts, to close the valve for that zone. When all
thermostats are satisfied (also when the clock period ends)
all relays will be off, so the zone valves which were open will
remain open for the pump overrun period.
LEGEND
INST
ALLA
TION
Summary of Contents for Concord CXSD 100
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