Electrical Wiring - Dunkirk D247 Installation Instructions Manual

REMOVING EXISTING BOILER FROM
COMMON VENTING SYSTEM
When an existing boiler is removed from a common venting
system, the common venting system is likely to be too large for
proper venting of the appliances remaining connected to it.
At the time of removal of an existing boiler, the following steps
shall be followed with each appliance remaining connected to
the common venting system placed in operation, while the other
appliances remaining connected tothe common venting system
are not in operation.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies which
could cause an unsafe condition.
Insofar as is practical, close all building doors and windows
and all doors between the space in which the appliances
remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the common
venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
4. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
wilt operate continuously.
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a match
or candle, or smoke from a cigarette, cigar or pipe.
6. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-burning
appliance to their previous conditions of use.
7. Any improper operation of the common venting system
should be corrected so the installation conforms with the
National Fuel Gas Code, ANSI Z223. l-latest issue. When
resizing any portion of the common venting system, the
common venting system should be resized to approach the
minimum size as determined using the appropriate tables
in Part 11 in the National Fuel Gas Code, ANSI Z223.1
-latest issue.
ELECTRICAL WIRING
Wiring connections are to be made in accordance with the
National Electrical Code, ANSI/NFPA 70-1984 and/or local
authority having jurisdiction. When an external electrical source
is utilized, the boiler must be electrically grounded in accordance
with these requirements. Install a fused disconnect switch
between boiler and electrical panel in a convenient location.
The wiring from high temperature limit control should be secured
to the boiler jacket or gas piping to prevent an accidental
disconnect from controls.
All wiring to gas valves must be taped securely to the gas supply
lines or run in an appropriate conduit.
WARNING
TURN OFF ELECTRIC POWER AT FUSE
BOX BEFORE MAKING ANY LINE
VOLTAGE CONNECTION. FOLLOW
LOCAL ELECTRICAL CODES.
INSTALLING THERMOSTAT
The thermostat location has an important effect on the operation
of the boiler system. Be sure to follow the instructions included
with the thermostat. Locate the thermostat about 5 feet above
the floor on an inside wall. It should be sensing average
temperature, so avoid the following:
Dead Spots:Behind Doors
Corners and Alcoves
Hot Spots: Concealed Pipes
Fireplaces
TV Sets
Lamps
Direct Sunlight
Kitchens
Cold Spots: Concealed Pipes or Ducts
Stairwells
Drafts
Unheated Rooms on other side of walt
Keep thermostat(s) at desired room temperature. If windows
are to be opened or heat is not needed, set thermostat(s) pointer
to a lower setting.
ADJUST THERMOSTAT HEAT ANTICIPATOR
Suggested heat anticipator settings are shown in the wiring
diagrams (Figures 26, 27 and 28). Set accordingly Then follow
instructions packaged with thermostat for the final adjustment,
checking thermostat operation. When set above temperature
indicated on the thermometer, boiler bumers should ignite. Make
certain the thermostat(s) turns off the boiler when room
temperature reaches the selected setting and starts the boiler
operating when room temperature falls a few degrees.
Finally, set the thermostat for the desired temperature. Special
conditions in building and the location of the thermostat witl
govem this setting.
STAGE FIRING MULTIPLE BASE BOILERS
1 . STEAM BOILERS
Multiple base steam boilers should not be stage fired due
to fluctuations in water line between fired and unfired bases.
The boiler should be all bases on or all bases off. When
more precise control than a single thermostat offers is
required, a weather responsive duty cycle control such as
the Honeywell model ZG-54 or the Heat Timer model MPC
or model EPU or a similar type of control should be used.
These controls determine boiler run time based on outdoor
temperature. Consult the various control manufacturers. It
stage firing is required, consult the boiler manufacturer.
2. HOT WATER BOILERS
Multiple base hot water boilers are ideal for stage firing.
Many controls are available for sequencing or stage firing
multiple base hot water boilers. We offer a W7100J Outdoor
Reset Stage Fire Control Package that wilt sequence up
to six bases, with lead/lag, soft start, adjustable reset ratio
and setpoint, and microprocessor control. This control will
fire bases as required to maintain supplywater temperature
at a desired set point, which is automatically varied based
on outdoor air temperature. Consult the boiler manufacturer
for more information.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.