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VI. Electrical
A.
General. Install wiring and ground boiler in accordance
with requirements of authority having jurisdiction, or
in absence of such requirements the National Electrical
Code, ANSI/NFPA 70.
B.
Connect Vent Damper. See Figure 11.
1. Carefully remove Transformer from Junction Box.
2. Remove 7/8" knockout from top of Junction Box.
3. Attach Vent Damper wiring harness into top of
Junction Box.
4. Connect Vent Damper Wiring Harness to Vent
Damper Receptacle.
C.
Wire Low Water Cutoff (McDonnell & Miller 67
Only). Attach Black wire to Terminal '1'. Attach Black-
White wire to Terminal '2'.
D.
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 water pipes,
lighting fixtures, television, or sunlight. Allow free air
movement by avoiding placement of furniture near
thermostat.
E.
Wire thermostat. Provide Class II circuit between
thermostat and boiler. Connect to Blue transformer lead
and Brown relay lead. Set thermostat heat anticipator
to 0.4 amps. If system tends to overheat above
thermostat's temperature setting, reduce heat anticipator
setting by 0.1 or 0.2 amps. If system tends to
shortcycle without reaching desired room temperature,
increase heat anticipator setting by 0.1 or 0.2 amps.
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Figure 13: Vent Damper Schematic Wiring Diagram
Table 8: Wiring Diagrams
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F.
Wire boiler. Boiler is rated for 120 VAC, 60 hertz, less
than 12 amperes. Provide individual branch circuit with
fused disconnect. Connect to black and white wires and
green ground screw. Install Transformer on Junction
Box.
G.
Vent Damper Sequence of Operation. See Figure 13.
1. Vent Damper continuously powered at Terminal 1.
2. Call for heat energizes Vent Damper through
Terminal 5.
3. Vent Damper reaches fully open position. Power is
sent back to gas control circuit through Terminal 2.
4. Call for heat ends. Vent Damper closes.
Note: After Vent Damper is installed and operated
through one cycle, the control circuit will operate only
when Vent Damper is connected in control circuit.
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13
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