Add-On Thermolec Wiring Explanation - KERR Highlander Owner's Manual

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.
f) Double Aquastat (Honeywell L6081A1010, Only)
Differential, Top Right Setting 10°F
This is the temperature rise during the boiler operation corresponding to the Low limit
setting.
g) The triple aquastat on the oil boiler controls the oil 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 it 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).

2.12 ADD-ON THERMOLEC WIRING EXPLANATION

a) The wood system neutral is connected to the oil boiler neutral.
b) The line power for the weed boiler must come from the same power disconnect switch as
the oil boiler.
c) Single Aquastat (Honeywell L6006A1012)
Setting 160°F.
This operates the circulation pump to circulate hot water between the two boilers when
wood boiler is in operation and up to the temperature setting.
The normally open (N/O) contacts on the single aquastat should be connected to the
secondary circulation pump between the wood and oil boilers (as shown in plumbing
diagram TW-1). The same N/O contacts also energize a relay to open the circuits to the
electric boiler's load management or dual energy sensor. The relay also opens the
contacts to the electric boiler's circulator if this circulator is not the primary loop circulator.
If the circulator is part of the primary plumbing loop than the circulator wiring should not
be run through the relay.
If the wood boiler is up to temperature than the wood circulator will run. If there is a call
for heat hot water from the wood boiler will satisfy the heating requirements. If the
temperature in the wood boiler is below the single aquastat setting, then the existing
boiler will operate to satisfy the heating requirement.
HIGHLANDER
HIGHLANDER WOOD–FIRED BOILER – INSTRUCTION MANUAL
16 Nov-09