20
20
Over heat Safety Zone
OverHeat Safety Zone (Dump Zone): STRONGLY RECOMMENDED in all installations.
When the pellet boiler is operating at High burn, and all demand from the heating system stops, the control will
reduce the feed rate and shut down completely as necessary. This may take several minutes, and the remaining heat
may cause the water temperature to continue to rise. If the temperature gets too high, the OVERHEAT SAFETY
ZONE light on the control (see page 23) will illuminate, and the DARK BLUE circuit in the junction box is
energized(see wiring diagram). This circuit will flow 120V to operate a circulator pump installed to flow to the
overheat dump zone established in the original installation plan. If opening a zone valve is the chosen method of
dumping the excess heat, a voltage reduction relay will most likely be needed. If the water temperature continues
to rise to the risk of boiling point, the feed system will stop and the boiler will shut-down. A manual reset will
then be required to operate the boiler. Without a dump zone in place, the excess temperature could build pressure
to the point of opening the relief valve, or with the atmospheric conversion it may allow the water to boil and
exit through the over-flow of the atmospheric tank. Both scenarios may create water damage and/or a slip hazard.
The boiling temperature of water varies at different altitudes and atmospheric pressures. Therefore, at elevations
above 3000 feet, and when using the atmospheric conversion, circuit board dipswitch #6 must be in the “ON”
position.
MINIMUM OF 72" OF 3/4"
FINNED BASEBOARD
(HIGH TEMPERATURE) BASEBOARD HEAT
SYSTEM RETURN
SHUT-OFF VALVE
NOTE: ALWAYS REFER TO THE INDIVIDUAL COMPONENTS
RECOMMENDED INSTALLATION INSTRUCTIONS FOR THE PROPER
MOUNTING POSITION AND LOCATION WITHIN THE PIPING SYSTEM.
120VAC,NORMALLY OPEN,FULL FLOW,
SOLENOID VALVE or EQUIVALENT
THE SOLENOID SHOULD BE
POWERED BY THE SAME
CIRCUIT AS THE BOILER
BASEBOARD MUST BE AT LEAST
24" HIGHER THAN BOILER FOR
PROPER GRAVITY FLOW
UNION
BALANCING
VALVE
UNION
PIPE TO WITHIN
6" OF THE
FLOOR OR A
FLOOR DRAIN
* TEMPERATURE/PRESSURE GAUGE
* AQUASTAT WELL
* PRESSURE RELIEF VALVE
SHUT-OFF VALVE
* ITEMS SUPPLIED
POWER FAILURE SYSTEM SUPPLY 3/4"
SYSTEM SUPPLY
POWER FAILURE SYSTEM RETURN 3/4"
EXAMPLE OF PIPING IN ACCORDANCE
WITH (CAN/CSA-B366.1)
A POWER FAILURE HEAT DISSIPATION LOOP
power Failure / heat dissipation loop
Summary of Contents for PB 105
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