Electrical Wiring - Dunkirk PSB-3D Installation, Operation & Maintenance Manual

ELECTRIC POWER SUPPLY
All electrical work must conform to local codes, as well as the
National Electrical Code, ANSI/NFPA-70.
Run a separate 115 volt circuit from a separate overcurrent
protective device in your electrical service 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 115 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. 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.
Turn off electrical power at fuse box before
!
making any line voltage connections. Follow
local electrical codes.
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 fi ve feet above the fl oor on
an inside wall. It may be mounted directly on the wall or
on a vertically mounted outlet box. It should be sensing
average room temperature, so avoid the following:
DEAD SPOTS:
Behind doors
Corners and alcoves
HOT SPOTS:
Concealed pipes
Fireplace
TV sets
Radios
Lamps
Direct sunlight
Kitchens
COLD SPOTS:
Concealed pipes or ducts
Stairwells - drafts
Doors – drafts
Unheated rooms on other side of wall

ELECTRICAL WIRING

WARNING
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 fl oat type low water
cut-off, the two wires are black. One wire is located 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 of 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 fl oat type low water
cutoffs, 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 off's, 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 volt single pole single throw
(SPST) normally open (N.O.) relay is required, such as the
Honeywell R8222A or equivalent. Wire as shown in Fig. 10A
or Fig. 10B.
VENT DAMPER
The boiler is equipped with a factory wired harness with 4
pin molex plug, that plugs into a 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.
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CAUTION