Electrical - Burnham 8HE Series Installation, Operating And Service Instructions

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Electrical

• Positively assure all electrical connections are unpowered before attempting installation or service of electrical
components or connections of the boiler or building
• Lock out all electrical boxes with padlock once power is turned off.
• Electrical power may be from more than one source. Make sure all power is off before attempting any electrical work
• Failure to properly wire electrical connections to the boiler may result in serious physical harm.
• Each boiler must be protected with a properly sized fused disconnect.
• Never jump out or make inoperative any safety or operating controls.
• The wiring diagrams contained in this manual are for reference purposes only. Each boiler is shipped with a wiring
diagram attached to the front door. Refer to this diagram and the wiring diagram of any controls used with the
boiler. Read, understand and follow all wiring instructions supplied with the controls.
A. Install Boiler Wiring
1. Knockdown boilers only. Locate wiring
harnesses in Combination Boiler Parts and
Control Carton. Refer to Figure 6-1 and
connect wiring as shown.
2. Connect supply wiring and electrically ground
boiler in accordance with requirements of
authority having jurisdiction, or in absence
of such requirements the National Electrical
Code, NFPA 70.
B. Wire Vent Damper.
1. Attach Vent Damper Harness to mounting hole
in Jacket Left Side Panel. Install Cable Clamp
around flexible conduit and attach to Jacket
Top Panel.
2. Plug Vent Damper Harness Plug into Vent
Damper Receptacle in Hydrostat 3200 limit
control. See Figure 5-2.
C. Install thermostat. Locate on inside wall
approximately 4 feet above floor. Do not install on
outside wall, near fireplace, or where influenced
by drafts or restricted air flow, hot or cold pipes,
lighting fixtures, television, or sunlight. Allow free
air movement by avoiding placement of furniture
near thermostat.
Heat anticipator setting for non-digital thermostats
is 0.2 Amp. For digital thermostats that include
an adjustable heat anticipator, set anticipator
per thermostat manufacturer recommendations.
If room heats above thermostat temperature
setting, reduce heat anticipator setting. If boiler
short cycles without room reaching desired
temperature, increase anticipator setting.
D. Wire thermostat. Provide Class II circuit between
thermostat and boiler.
111828-01 - 1/23
8HE Installation, Operating & Service Instructions
!
DANGER
!
WARNING
E. Alliance Indirect Water Heater (if used).
Refer to Alliance Indirect Installation, Operating
and Service Instructions for wiring, piping and
additional information.
F. Vent Damper Sequence of Operation. See Figure
6-1 for schematic wiring diagram.
1. The Vent Damper is continuously powered at
Terminal 1.
2. When there is a call for heat, the damper relay
coil is energized through Terminal 5 if all limits
ahead of the damper are satisfied.
3. The relay coil closes contacts which energize
the damper motor, causing the damper to
open.
4. When the damper blade reaches the fully open
position, power is sent back to the ignition
circuit through Terminal 2 and the damper
motor is de-energized.
5. When the call for heat is satisfied, the damper
relay coil is de-energized - closing contacts
which energize the damper motor. This causes
the damper to close. When the damper blade
reaches the fully closed position, the damper
motor is de-energized.
POWER FAILURE - The damper blade will stop
in the position it was in when power failed.
(Combustion can never take place unless the
damper blade is in the fully open position).
G. Sequence of Operation and Wiring. Refer to next
page for Sequence of Operation and Figure 6-1
for wiring.
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