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GAS-FIRED BOILER Boiler Manual
PART 9: FIELD WIRING
A. INSTALLATION MUST COMPLY WITH:
1. National Electrical Code and any other
national, state, provincial or local codes or
regulations.
2. In Canada, CSA C22.1 Canadian Electrical
Code Part 1, and any local codes.
B. FIELD WIRING
The Munchkin Boiler box has a 24 volt terminal
strip on the boiler cabinet and 120 volt terminal
strip enclosed in the electrical box. Each terminal
connection is clearly marked to assure correct in-
stallation.
C. LINE VOLTAGE WIRING
1. Connect 120 VAC power wiring to the line
voltage terminal strip located inside the
electric junction box, as shown in figure 9.5.
2. Wire the Boiler Primary Circulator (P1) to the
terminal strip. See wiring diagram in this
section.
D. THERMOSTAT
1. Connect room thermostat or end switch
2. Install thermostat on inside wall away from
influences of drafts, hot or cold water pipes,
lighting fixtures, television, sunrays or
fireplaces.
3. Thermostat anticipator (if applicable):
a. If connected directly to boiler, set for 0.1
amps.
b. If connected to relays or other devices,
set to match total electrical power
requirements of connected devices. See
specifications of the device and
thermostat instructions for details.
WARNING
ELECTRICAL SHOCK HAZARD — For your
safety, turn off electrical power supply at service
entrance panel before making any electrical
connections to avoid possible electric shock
hazard. Failure to do so can cause severe
personal injury or death.
NOTICE
Wiring must be N.E.C. Class 1.
If original wiring as supplied with boiler must be
replaced, use only TEW 105 °C wire or
equivalent.
Boiler must be electrically grounded as required
by National Electrical Code ANSI/NFPA 70 —
latest edition.
GAS VALVE SHUT OFF
INLET SOLENOID
OUTLET SOLENOID
THROTTLE SCREW
FIRST VALVE
MAIN GAS VALVE
MEASURE OFFSET HERE
OFFSET ADJUSTMENT
WARNING: IF FOR ANY REASON THE THROTTLE
NEEDS TO BE ADJUSTED, IT IS VERY IMPORTANT
THAT A COMBUSTION ANALYZER BE USED TO
ENSURE SAFE AND PROPER OPERATION.
THE ADJUSTMENT COULD AFFECT THE CO/CO2
LEVELS. MAKE SURE THE LEVELS CORRESPOND
TO THE COMBUSTION SETTING CHART FIG 12-1
IN PART 12
Fig. 8-3
E. KROM SCHRODER VALVE FOR 399M