Electrical Wiring; Boiler Operation - Smith 28HE Series Installation & Operating Instructions Manual

SERIES 28HE STEAM BOILER INSTALLATION AND OPERATION INSTRUCTIONS
WARNING: Never use an open fl ame 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 the manual shut off valve in
the gas supply pipe to the boiler. 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 from the gas
supply.

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 circuit properly rated 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 fi eld wiring of any controls or other devices
must conform to the temperature limitation of type TEW
wire at 95°F, 35°C above room temperature. Use copper
conductors with a minimum size of #14 awg.

BOILER OPERATION

WARNING: Before proceeding read and fully
understand the instructions contained in this
manual. Do not attempt to operate this boiler if
it has not been installed in accordance with the
guidelines set forth in this manual. Failure to
comply with this warning can result in extensive
property damage, severe personal injury or
death!
Steam Boilers
Fill the boiler with water to the normal water level line
of 50 1/2 in., 1.28 m from the fl oor.
If the boiler is connected to a hot steam line, keep the
cold boiler valved off line and fi re the burner until the
boiler pressure exceeds the system pressure by 1 to 2
psig, 7 to 14 kPa. Slowly open the main isolation valve
on the boiler to bring it on line.
CAUTION: Never place a cold boiler into service on
a hot steam line or severe damage to the boiler and
piping can occur voiding the warranty!
Steam entering a cold boiler will cool quickly and can
cause severe steam hammer and boiler fl ooding. Idle
boilers not valved off from the system should have an
overfl ow installed to prevent it from being fl ooded.
If an overfl ow trap is not installed per Figure 25, and
the boiler becomes fl ooded, the fl ooded boiler must be
heated to a near steaming condition, 210°F, 99°C, then
drained to the correct water level.
Steam Boilers
Follow the burner manufactures lighting instructions
that were supplied with the burner.
WARNING: Never attempt to start the burner
if the combustion chamber contains excess
oil or gas, when the boiler is full of vapor or
the combustion chamber is very hot. Failure
to comply with this warning can result in an
explosion causing extensive property damage,
severe personal injury or death!
A properly adjusted gas burner on high fi re will produce
a maximum CO of 10.4% with a maximum CO of 300
2
ppm. When fi ring on oil at high fi re, the burner should
be adjusted to produce a maximum CO
with only a maximum trace of smoke. The fl ue gas
samples should be taken at the smoke hood. Confi rm
proper burner adjustment with a calibrated combustion
analyzer.
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