Operating instructions

G. AUTOMATIC FILL VALVE (NOT PROVIDED)
For safe, efficient operation, a hot water system must be filled with water. Adding new water when needed can be done manually (by use of a
hand valve in water supply line). This requires regular attention to system’s needs. An automatic fill valve accomplishes this without attention.
It is installed in supply line on hot water boilers only. The valve operates through water pressure differentials. It does not require electrical
connection.
H. DRAIN VALVE (PROVIDED)
This manual valve provides a means of draining all water from boiler and system. It is installed in a tee where return line enters boiler.
I. CIRCULATING PUMP (PROVIDED)
Every forced hot water system requires a circulating pump. A separate pump or zone valve is required for each zone if there are 2 or more zones.
This pump must have the capacity to provide circulation required by system. The pump is connected into return main just ahead of boiler. It is
also wired to electrical system.
Fig. 14—Wiring Diagrams for Boilers With and Without Tankless Heater Coil
A01036
L1
FIELD WIRING
24 VOLT THERMOSTAT
L8124C
AQUASTAT
NEUT
HOT
120V
POWER
SUPPLY
OVERCURRENT
PROTECTED
DISCONNECT
BK W
R
BK
BK
W
W
R
CIRCULATOR
PUMP
IGNITION
TRANSFORMER
OIL BURNER
MOTOR
BK
BK
W
BK
O
R4184
RELAY
CAD CELL
Y
Y
120/60/1 OVERCURRENT PROTECTED DISCONNECT
BOILER WITHOUT TANKLESS HEATER COILBOILER WITH TANKLESS HEATER COIL
LINE
NEUTRAL
24 V THERMOSTAT
FIELD WIRING
OIL BURNER
MOTOR
L8148A
AQUASTAT
IGN
TRANS
B
W
CIRCULATOR
BW
B
W
W
B
O
B
B
R4184D
RELAY
Y
Y
CAD
CEL
IK1
JUMPER
IK IK2
B2 C2
C1 ZC
F
F
ZR B1
L2 T T
T T
G
GND
L1
(HOT)
L2
L1
L2
B1
B2
C1
B
R
ZR
BRW
ZC
C2
HIGH LIMIT
1K2
LOW LIMIT/
CIRCULATOR
COLOR CODE
BK=BLACK
O=ORANGE
Y=YELLOW
R=RED
W=WHITE
1K1
1K
A
R
LINE
VOLTAGE
CLASS II
24 VOLTS
TTL2L1
3
F
F
B
3TT
C1
C2 B2 B1L2
L1
B
R
G
B2B1C2C1
COLOR CODE
B=BLACK
W=WHITE
O=ORANGE
Y=YELLOW
OIL
VALVE
OIL
VALVE
—13—
→