HIGHLANDER WOOD–FIRED BOILER – INSTRUCTION MANUAL
HIGHLANDER 17 Nov-09
d) Double Aquastat (Honeywell L6081A1010)
High Limit Left Side Setting 200°F.
This is the wood high limit. If the water temperature in the wood boiler reaches 200°F the
wood boiler air damper closed and the safety by-pass zone valve is opened. The end
switch on the safety by-pass zone valve makes a call for heat on the oil boiler triple
aquastat, which starts the primary circulator. Metal – Brass 150°F.
e) Double Aquastat (Honeywell L6081A1010)
Low Limit, Bottom Right Setting 170°F.
This is used to maintain the wood boiler at the set temperature by opening and closing
the wood boiler air damper. Metal – Brass 150°F.
f) Double Aquastat (Honeywell L6081A1010)
Differential Top Right Setting 10°F.
This is the temperature rise during the boiler operation corresponding to the Low limit
setting.
The electric boiler controls will operate the boiler in the normal manner.
The safety by-pass zone is only shown in plumbing diagram TW-1. The safety by-pass dump
zone should be plumbed from the wood boiler in the case of high limit condition or power
outage. This will provide heat to the house by gravity flow. The dump zone should be to the
largest living area and should be an area above the wood boiler (for gravity flow during a
power outage). Also this zone shall NOT have any plastic piping such as in-floor heat,
because the hot water from the wood boiler may damage the tubing.
The supply from the wood boiler should only be connected to the plumbing system after the
primary circulator and in conjunction with a flow check valve on the wood supply line. This will
not allow hot water to flow through the wood boiler when the secondary circulation pump is not
in operation (no fire in wood boiler).
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