15
ELECTRICAL WIRING
Set heat anticipator at 0.4 amps for boilers
equipped with standing pilot, and at 0.6 amps for
boilers equipped with intermittent ignition. The
24 Volt thermostat leads shall be connected to
the two wires tagged “24 Volt thermostat” on the
boiler. For boilers with 67D-1 float type low water
cut-off, the two wires are black. One wire is lo-
cated on the secondary of the 24 Volt transformer,
the second wire is located on the pressure limit
control. For boilers with PS-802 probe type low
water cut-off, one wire is green and is located on
terminal B or the PS-802, the second wire is black
and located on the pressure limit control.
electronIc tHerMostats
Certain types of electronic thermostats may lose
their memory or shut down. With 67D-1 float type
low water cut-offs, this may occur each time the
thermostat calls for heat, due to the internal circuit
in the vent damper. With PS-802 probe type low
water cut-offs, this may occur each time the low
water cut-off detects a low water condition. If this
is the case, an isolation relay is required for the
thermostat circuit. A 24 bolt single pole single
throw (SPST) normally open (N.O.) relay is re-
quired, such as the Honeywell R8222A or equiva-
lent. Wire as shown in
Figures 14A
or
14B
.
Vent DaMper
The boiler is equipped with a factory wired
harness with 4 pin molex plug, that plugs into the
4 pin molex receptacle inside the vent damper
operator.
The vent damper must be connected for the
boiler to operate. Wiring diagrams follow for the
various different models.
label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
electrIc poWer sUpplY
All electrical work must conform to local codes,
as well as the National Electrical Code, ANSI/
NFPA-70, latest revision.
Run a separate 120 Volt circuit from a separate
over-current protective device in your electrical ser-
vice entrance panel. This should be a 15 ampere
circuit. Locate a shut-off switch at the boiler. It must
be turned off during any maintenance. Connect 120
Volt electrical supply to the primary leads on the
24 Volt transformer. Solder and tape or securely
fasten these connections with wire nuts.
The boiler, when installed, must be electrically
grounded in accordance with the requirements of
the authority having jurisdiction or, in the absence of
such requirements, with the National Electrical Code,
ANSI/NFPA No. 70-latest revision. Run a 14 gauge
or heavier copper wire from the boiler to a grounded
connection in the service panel or a properly driven
and electrically grounded ground rod.
Install YoUr tHerMostat
The thermostat location has an important effect
on the operation of your boiler system.
BE SURE
TO FOLLOW THE INSTRUCTIONS INCLUDED
WITH YOUR THERMOSTAT.
Locate the thermostat about five feet above
the floor on an
inside wall. It
may be mount-
ed directly
on the wall
or on a verti-
cally mounted
outlet box.
It should be
sensing av-
erage room
temperature,
so avoid the
following:
Turn off electric power at fuse box before making any line
Voltage connections. Follow local electrical codes.
WARNING
!
!
tHerMostat locatIons to aVoID
DeaD spots:
Comers and
alcoves
Behind doors
colD spots:
Hot spots:
Concealed pipes
or ducts
Concealed pipes
Fireplace
Stairwells - drafts
TV sets
Radios
Unheated rooms
on
other side of wall
Lamps
Direct sunlight
Kitchens
CAUTION
!
!
