Slant/Fin HWT-120 - Manual (Page 11)

11 INDIRECT FIRED WATER TANK
V WIRING (cont’d)
COLD START BOILER APPLICATION - PRIORITY FIGURE 4
POWER
INPUT
ZONE 1
ZC
X X
END SWITCH
ZR
120 VOLT CIRCULATORS
SIX ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
THERMOSTAT
ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE 1
ZONE 1
POWER
ZONE 2
ZONE 3
ZONE 4
ZONE 5
ZONE 6
JUMPER TO: "TT" ON BOILER
24 VAC
POWER
FUSE 1 AMP
120 V RELAY
ZONE 6
PRIORITY
SR 506 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ON
OFF
T
TACO SR504 & SR506
SWITCHING RELAYS
120 VAC OUTPUT
I
INDIRECT TANK
TEMP CONTROL
I
INDIRECT
TANK
CIRCULATOR
Operation: When any thermostat calls for heat, the
appropriate circulator is energized and the isolated
end switch (X and X) will start the boiler.
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.
Jumper Placement: The jumper should be placed
between terminals ZC and ZR. Connect the
isolated end switch to the aquastat control on the
boiler.
Power Input: Connect 120 volt as power input to
terminals N and H. Neutral wire to terminal N. Hot
wire to terminal H.