TW2000 WOOD–FIRED BOILER – INSTRUCTION MANUAL
TW2000 16 Jan-08
2.11 TW-2000 Parallel Plumbing Wiring Explanation TW-2000
a) The wood system neutral is connected to the oil boiler neutral.
b) The line power for the wood boiler must come from the same power disconnect switch as
the oil boiler.
c) Single Aquastat (White Rodgers 1131-102) Metal 160°F
(Honeywell L6006A1012)
This operates the circulation pump to circulate hot water between the two boilers when
the wood boiler is in operation.
The N/O contacts on the single aquastat White Rodgers (1131-102) should be connected
to the secondary circulation pump between the wood and oil boilers (as shown in
plumbing diagram TW-1).
d) Double Aquastat (White Rodgers 1161-12) High Limit Left
(Honeywell L6081A1010)
This is the wood high limit. If the water temperature in the wood boiler reaches 200?F the
wood boiler air damper is 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 200°F
Brass 190°F
e) Double Aquastat (White Rodgers 1161-12) Low Limit Right
This is used to maintain the wood boiler at the set temperature by opening and closing
the wood boiler air damper.
Metal 170°F
Brass 150°F
f) 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).
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