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Part Number 550-110-677/0299
18
o
NOTES:
TO COMPONENT MANUFACTURER’S INSTRUCTIONS FOR APPLICATION WIRING AND
FOR MULTIPLE ZONE SYSTEMS USING ZONE VALVES OR CIRCULATORS, REFER
5. THERMOSTAT - FOR SINGLE ZONE SYSTEMS, THERMOSTAT ANTICIPATOR SETTING IS 0.40 AMPS.
4. REFER TO CONTROL COMPONENT INSTRUCTIONS PACKED WITH BOILER FOR APPLICATION
3. IF ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED,
8. PILOT LEADWIRES ARE NOT FIELD REPLACEABLE. REPLACE
7. DENOTES FIELD INSTALLED CHASSIS GROUND.
9. OPERATING CONTROL REQUIRED WITH TANKLESS HEATER.
INSTALLATION/OPERATING MANUAL.
EMCS - FOR EMCS CONNECTION IN PLACE OF THERMOSTAT, REFER TO EMCS
THERMOSTAT ANTICIPATOR SETTING.
TYPE 150 C OR IT’S EQUIVALENT MUST BE USED.
NATIONAL, PROVINCIAL OR LOCAL CODE REQUIREMENTS.
B. CANADA - C.S.A. C22.1 CANADIAN ELECTRICAL CODE PART 1 AND ANY OTHER
A. U.S.A. - NATIONAL ELECTRICAL CODE AND ANY OTHER NATIONAL, STATE OR LOCAL
1. ALL WIRING MUST BE INSTALLED IN ACCORDANCE WITH:
ELECTRICAL SHOCK HAZARD, CAN CAUSE SEVERE
INJURY OR DEATH. DISCONNECT POWER
BEFORE INSTALLING AND/OR SERVICING.
2. ALL CONTACTS SHOWN WITHOUT POWER APPLIED-OFF SHELF CONDITION.
CODE REQUIREMENTS.
INFORMATION.
6. L.W.C.O., PRESSURE CONTROLS, WIRED IN SERIES.
10. ALARM CONTACT RATINGS: 15 AMP @ 250 VAC.
PILOT ASSEMBLY IF NECESSARY.
11. REMOVE JUMPER BAR BETWEEN TERMINAL "H" AND TERMINAL "C".
IGNITION CONTROL PANEL TERMINAL.
TRANSFORMER TERMINAL.
IGNITION CONTROL MODULE TERMINAL.
IGNITION CONTROL PANEL LAMP
HIGH VOLTAGE FIELD
LOW VOLTAGE FACTORY
R
HIGH VOLTAGE FACTORY
IGNITION CABLE
LOW VOLTAGE FIELD
SPARK
24V (G)
SENSE
2
SENSOR
IGNITOR
R
2K
MV/PV
PV
MV
1
1
A
ALARM
24V
ALARM
2K1
GAS VALVE
ROBERTSHAW
D
D
TR
TH
2K2
2K3
N/A
SEE NOTE 10
2K4
2
A
VALVE
PILOT
TRANSFORMER
FUSE
DAMPER
TO
22
11
66
44
5
3
5
3
THERMOSTAT
CABLE
1K1
MANUAL RESET
PROBE LWCO
RELAY COIL
1K
LADDER WIRING DIAGRAM
SWITCH
120 V.A.C.
SERVICE
SOLENOID
Y
G
R
EQUIPMENT
(NOTE 7)
GROUND
PRESSURETROL
PRESSURETROL
MANUAL RESET
OPERATING CONTROL
& PUMP
CONTROL
NHCWB
(NOTE 11)
FLOAT LWCO
C
550-225-028/0399
Figure 9
Water boiler wiring —
ladder and schematic diagrams
Wiring — steam
pumped return
VI