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Page 30
7.3
24 VAC Transformer with Integral
Circuit Breaker
24 VAC is supplied by a transformer mounted on the
control panel. All 24 VAC power is supplied through
a circuit breaker that is part of the transformer. The
transformer is then connected to terminal blocks 1
and 2 (TB1 and TB2).
7.4
Signal Connections
See Section 9 for details on the following
connections:
•
System sensor
•
Call for heat/thermostat
•
Outdoor air temperature sensor
•
Aquastat for domestic hot water
•
External control connections
7.5
Optional Low Water Cut Off (LWCO)
Specific instructions for the installation of a Low
E23460
DWG NO.
Water Cut Off (LWCO) are the following:
Locate the wiring diagram (Figure 22). On the wiring
REV.
diagram, locate the connection points marked
A
Low Water Cut Off. These are the electrical
CHANGE:
connection points for the LWCO. Follow LWCO
Manufacturer's Wiring Instructions.
OUTLET WATER
TEMP. SENSOR
J8-9
PRIM.
TEMP. SENSOR
J6-1 PRIM.
J9-5
PRIM.
J6-1 SEC.
J9-5
THERMAL CUT-OUT
SEC.
PRIM.
SEC.
J7-6 PRIM.
OUTLET WATER
J7-6 SEC.
TEMP. SENSOR
J8-9
SEC.
FLOW SWITCH
J8-5
PRIM.
INLET WATER
TEMP. SENSOR
J8-5
SEC.
VENTURI PRESSURE
SWITCHES PRIM.
{
Figure 20. Ladder Diagram, Field Connections
+
VENTURI PRESSURE
SWITCHES SEC.
ANALOG
-
INPUT PRIM.
2
J8-2
PRIM.
1
SH
J8-2
REVISIONS
SEC.
ECN
DRAFT
AH 2/12/14
14-013
ADDED SECONDARY CONNECTORS TO THE STACK
TEMP SENSOR. ZONE D-1
J8-8 PRIM.
1 3
2 4
J8-10 PRIM.
STACK
J9-4 PRIM.
1 5
J9-6 PRIM.
2 6
3 7
J9-4 SEC.
4 8
J9-6 SEC.
J8-8 SEC.
1 3
2 4
J8-10 SEC.
J7-5 PRIM.
J7-5 SEC.
1
J8-4 PRIM.
OPTIONAL LOW GAS
2
PRESSURE SW
J7-4 PRIM.
J7-4 SEC.
J8-4 SEC.
1
2
J5-1
PRIM.
J8-6 PRIM.
J5-1
SEC.
J8-7 PRIM.
Mechanically, install the LWCO device in a tee fitting
in the supply piping above the highest point of the
boiler (unless the boiler has an existing fitting for that
purpose). Follow LWCO Manufacturer's Instructions
DWG NO.
for minimum pipe sizing.
When a boiler is installed above radiation level, it
is required that a Low Water Cut-Off (LWCO) be
installed unless this requirement is superceded by
Jurisdictional requirements.
J8-9
Note: This boiler is a water tube boiler that requires
PRIM.
water flow through the heat exchanger for proper
operation. It does not have an operating water
J9-5
PRIM.
level and must be full at all times. In accordance
with ANSI/ASME CSD-1 Section CW-210 and The
J9-5
SEC.
National Fuel Gas Code ANSI Z223.1/NFPA 54
A
Section 10.3.5 a water tube boiler shall have a water
flow proving device in lieu of a Low Water Cut Off.
J8-9
SEC.
A
REV
7.6
Other Optional Field Connections
J8-5
PRIM.
Other Optional components, such as flow switches,
CHECK
ENGR APPR
additional high limits and other field supplied devices
BW
J8-5
can be installed as shown on the wiring diagram
SEC.
(Figure 20).
ANALOG
INPUT PRIM.
ANALOG
INPUT SEC.
OUTDOOR
SENSOR
TEMP. SENSOR
TEMP. SENSOR
SYSTEM
SENSOR
ALARM
B
RADFORD
E23460
SH
REV.
ECN
DRAFT
A
AH 2/12/14
WARNING
14-013
ADDED SECONDARY CONNECTORS TO THE STACK
CHANGE:
TEMP SENSOR. ZONE D-1
OUTLET WATER
TEMP. SENSOR
J8-8 PRIM.
1 3
2 4
J8-10 PRIM.
STACK
TEMP. SENSOR
J9-4 PRIM.
1 5
J9-6 PRIM.
2 6
3 7
J9-4 SEC.
4 8
J9-6 SEC.
OUTLET WATER
TEMP. SENSOR
J8-8 SEC.
1 3
2 4
J8-10 SEC.
J8-4 PRIM.
1
2
APPR
INLET WATER
TEMP. SENSOR
1
J8-4 SEC.
2
{
+
J8-6 PRIM.
-
{
J8-7 PRIM.
D
+
J8-6 SEC.
-
{
J8-7 SEC.
J8-12 SEC.
TEMP.
{
J7-11 SEC.
J9-1 PRIM.
DHW
{
PRIM.
J9-2 PRIM.
J9-1 SEC.
DHW
{
SEC.
J9-2 SEC.
J8-11 PRIM.
TEMP.
J8-12 PRIM.
J6-8 PRIM.
J6-8 SEC.
J6-7 PRIM.
J6-7 SEC.
C
W
HITE
A
1
REV
REVISIONS
ENGR APPR
CHECK
BW
FIELD
CONNECTIONS
APPR
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