U.S. Boiler Company ASPEN ASPN-320, Installation, Operating And Service Instructions

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Figure 10.7: TACO SR504 or Equivalent Zone Panel Wiring Connection Diagram
X. Wiring
(continued)
***USE SAME POWER SOURCE FOR ALL CONTROLS AND
ENSURE POLARITY TO ALL CONTROL DEVICES IS CORRECT
LOW VOLTAGE PCB
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
PRIORITY OFF
HEATING THERMOSTATS
24 VAC
POWER
REMOVE
JUMPER
HIGH VOLTAGE PCB
DHW
CIRCULATOR
L
N
120V
DHW
AQUASTAT
Low Voltage Connections
Fuse F1 250 V 1.6A Slow-Blow 5x20mm
EnviraCOM
MODBUS
Boiler-To-Boiler
Communication Network
V-
B
A
Header
Sensor
Outdoor
Sensor
Heat
T'stat
DHW
T'stat
External
Limit
Alarm
Spare
Fuse
120 VAC Connections
Pump Fuse
120 V Line
System
Pump
DHW
Pump
Boiler
Pump
Spare Pump Fuse
POWER
INPUT
ZONE 4 ZONE 3 ZONE 2 ZONE 1
120 VOLT CIRCULATORS
ZR ZC
X X
END
SWITCH
120V RELAY
FUSE 1 AMP
ZONE 4 ZONE 3 ZONE 2 ZONE 1
ON
OFF
ZONE 4
PRIORITY
TACO SR504
(OR EQUIVALENT)
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY