Smith Cast Iron Boilers GB300 - Manual (Page 40)

GB300 BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Page 40
ELECTRICAL WIRING
Electrical Power Connections
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation! Verify proper
operation after servicing.
The electrical connections to this boiler must be made
in accordance with all applicable local codes and the
latest revision of the National Electrical Code, ANSI/
NFPA-70. Installation should also conform with CSA
C22.1 Canadian Electrical Code Part I if installed in
Canada. Install a separate 120 volt 15 amp circuit for
the boiler. A shut-off switch should be located at the
boiler. The boiler must be grounded in accordance with
the authority having jurisdiction, or if none, the latest
revision of the National Electrical Code, ANSI/NFPA-70.
Line voltage field wiring of any controls or other devices
must conform to the temperature limitation of type T wire
at 95°F(35°C) above room temperature. Use copper
conductors with a minimum size of #14 awg.
The incoming line voltage is connected to the boiler using
the supplied junction box and transformer. All high voltage
connections must be contained inside the junction box
leaving only 24 volt termination exposed. The junction
box MUST be located on the side were the boiler controls
are located and on the jacket panel in the upper right
hand corner (1/2" max from the top and 1/2" max from
the front side of the jacket panel). Failure to mount the
junction box and transformer in this area will cause wire
harness length to not be of the proper size, resulting in
the inability to connect the termination points and
harnesses together. See Figure 101 Transformer
Location.
Figure 101 Transformer Location
Figure 100 Gas Supply Piping
When applicable, provisions for vent, bleed and gas
relief lines must be made in accordance with the latest
revision of ANSI Z223.1.
Safe lighting and other performance criteria were met
with the gas manifold and control assembly provided on
the boiler. All gas connections MUST be leak tested
before putting the boiler into operation.
WARNING: Never use an open flame to test for
gas leaks. Always use an approved leak detection
method. Failure to comply with this warning can
cause extensive property damage, severe
personal injury or death!
Whenever the gas supply piping is pressure tested the
boiler gas controls must be protected. If the test
pressure is equal to, or less than 1/2 psig (3.5 kPa)
isolate the boiler by closing it's manual shut off valve. If
the test pressure is greater than, or equal to 1/2 psig
(3.5 kPa), disconnect the boiler and its individual shut-
off valve.
TO GAS
CONTROL(S)
TO GAS SUPPLY
GROUND
JOINT
UNION
MANUAL
SHUTOFF
VALVE
INSTALL MANUAL
SHUTOFF VALVE
5FT. ABOVE FLOOR
WHERE REQUIRED
BY LOCAL CODES.
SEDIMENT TRAP & DRIP LEG
( TO EXTEND TO FLOOR )
PILOT SHUTOFF VALVE
GAS PRESSURE
TEST TAPPING
PILOT GAS PRESSURE
REGGULATOR
TO PILOT(S)
PILOT FILTER