13
WIRING DIAGRAMS FOR HOT WATER BOILERS
INTERMITTENT IGNITION
Z
P1-02
{
W
OVERCURRENT PROTECTED
VR8204A / VR8304M
FUSE BLOWS THE FIRST TIME THE THERMOSTAT CLOSES
AFTER THE VENT DAMPER IS PLUGGED IN. AFTER FUSE BLOWS,
THE L8148E1257 WILL OPERATE THE BURNERS ONLY IF THE
VENTDAMPER IS CONNECTED (PLUGGED IN).
1) S1A AND S1B ARE THE AUTOMATIC OPERATION / HOLD DAMPER
OPEN SWITCH. SWITCHSHOWN IN AUTOMATIC POSITION.
S2, S3, AND S4 ARE CAM ACTUATED SNAP SWITCHES.
SAFETY SHUT OFF
SAFETY SHUT OFF
FLAME ROLLOUT
BLOCKED VENT
1
NOTE:
PV/MV
G
R
MV
W
GND.
PV
GAS
MV/PV
UT 1003-620 SERIES
INTERMITTENT
MV
G
R
(GND.)
(24V)
SPARK
(24V)
GND.
PV
BK
W
BK BK BL
BT
PILOT CONTROL
DISCONNECT
P2-03
P2-04
P2-02
P1-04
BK
Y
P1-03
TO
VENT
AMPER
O
BK
BT
B1
B2
BK
L1
C1
1K1
L2
C2
1
FUSE
120 V. PRIMARY
24 V. SECONDARY
1K2
R
B
VALVE
TO PILOT BURNER
CIRCULATOR PUMP
115V/60HZ/1Ø
NEUTRAL
HOT
W
BK
L8148E1257 AQUASTAT
4 POLE CONNECTOR
VENT DAMPER CABLE
6 POLE CONNECTOR
P2-01
P2-05
P1-01
BR
TV
1K
W
24 V. THERMOSTAT
T
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THIS APPLIANCE MUST BE REPLACED,
IT MUST BE REPLACED WITH TYPE 105°C THERMOPLASTIC WIRE OR ITS EQUIVALENT
.
Note: S1A and S1B are the
automatic operation/hold damper
open switch. Switch is shown in
automatic position. S2, S3 and S4
are cam actuated snap switches.
Fuse blows fi rst time thermostat
closes after vent damper is plugged
in. After fuse blows L8148E1257 will
operate burners only if vent damper
is connected (plugged in).
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