Installation Guide

5
NOTE: Tankless coil has priority.
L1 L2
T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
L1 L2
(NEUTRAL)(HOT)
C
IRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNH NH
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
2
4 VAC
COM
THERMOSTATS
T