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10
V
WIRING (cont'd)
TANKLESS COIL BOILER APPLICATION - PRIORITY FIGURE 3
TACO SR504 & SR506
SWITCHING RELAYS
Operation: When any thermostat calls for heat, the
boiler is given a signal to start. The appropriate
circulator is energized only when the boiler temper-
ature is above the set low limit.
Priority Operation: When zone 6 is switched to
the priority setting and is actuated, all other zones
will stop operation until zone 6 is satisfied. When
zone 6 is not switched to priority, all zones will oper-
ate independently.
24 VAC
POWER
THERMOSTAT
SR 506
ZONE 1
120 V RELAY
ZONE 1
X X
ZC
ZR
END SWITCH
INDIRECT
TANK
CIRCULATOR
T
Jumper Placement: REMOVE the jumper
between terminals ZC and ZR. Connect terminal
ZC to ZC terminal on the aquastat control. Connect
terminal ZR to ZR terminal on the aquastat control.
Confirm polarity is consistent between boiler aqua-
stat and switching relay.
ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
Power Input: Connect 120 volt as power
SIX ZONE SWITCHING RELAY
input to terminals N and H. Neutral wire to
WITH OPTIONAL PRIORITY
terminal N. Hot wire to terminal H.
ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
120 VOLT CIRCULATORS
INDIRECT FIRED WATER TANK
INDIRECT TANK
TEMP CONTROL
INDIRECT TANK
TEMP CONTROL
ZONE 6
PRIORITY
ON
OFF
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 5
ZONE 6
POWER
INPUT
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