16
Concord CX
- Installation
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 via relay contacts to close the
15 INTERNAL WIRING
br
brown
r
red
LEGEND
b
blue
bk
black
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. At the start of the next call for heat (or the next clock
period) valves on zones not calling for heat will motor shut.
INST
ALLA
TION
INSTALLATION
y
yellow
w
white
g/y
green/yellow
or
orange
v
violet
pk
pink
16 ZONES WITH BI-DIRECTIONAL MOTORISED VALVES
Summary of Contents for Concord CX40
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