STEP 1
Prepare for Installation
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Check table 1 to be sure ThermGuard is compatible with your heating system. |
Hot water – Baseboard with direct control of zone valves
Hot water – Baseboard with zone control system (Taco, Erie, or equivalent)
Hot water – Radiant with direct control of zone valves
Hot water – Radiant with zone control system (Taco, Erie, or equivalent)
Table 1 – Compatibility Chart
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The only tools you will need are a
screwdriver (either slotted or Phillips; to match the screws on your
thermostat) and a sharp knife or wire strippers to strip wires. |
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Test to be sure your existing system is
working properly by turning up the temperature on your thermostat and
verifying that the system circulates hot water. If not, contact your local
heating service repair company before proceeding. |
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TURN OFF POWER to the system at the boiler, or at the
fuse/circuit breaker panel. |

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Remove the cover from your thermostat. If it does not snap off
when pulled firmly from the bottom, check for a screw used to lock on the
cover. |
STEP 2
Connect ThermGuard
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Once the front of the thermostat is removed, look for two
screws that connect with the wires coming from the wall. On some thermostats,
the thermostat must be removed from the wall to access the screw terminals.
In this case, once the front of the thermostat is removed, unscrew the
thermostat back from the wall and look for the screws. |
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There are two wires on the top of ThermGuard that must be
connected to your existing thermostat. These wires should be connected to the
terminals labeled R (or RH) and W. |
If you have only two wires
connected to your existing thermostat, ThermGuard simply connects to these two
wires. It doesn’t matter which ThermGuard wire goes to which terminal. Just
connect them in the most convenient manner. This connection can be made by
loosening the screws that hold the existing wires and inserting the ThermGuard
wires with the existing wires. Please be sure both sets of wires are secured in
place by tightening the screws back down.
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If the thermostat back was removed from the wall, carefully
replace the back of the thermostat and be certain it is replaced level. This
is very important on mercury-switch thermostats. |
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Make sure that the wires from ThermGuard do not interfere with
the movement of the thermostat. If necessary, tape the wires to the
thermostat back. |
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Replace the cover on the thermostat. |
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Position ThermGuard below the thermostat and remove the backing
of the double-stick tape. Securely position ThermGuard to the wall by gently
applying pressure to the front of the unit. |
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Verify the ON/OFF switch on ThermGuard is in the OFF position. |
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Turn on power to the system at the boiler, or at the
fuse/circuit breaker panel. |
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