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TH147 and TH148LE 400-147-010-C 27/11/06 2/4
2.3 Connecting the Thermostat
Refer to the following table for matching the wire labels with the
thermostat terminals.
Note: Do not connect wires identified as C, X or B. Wrap the bare
end of these wires with electrical tape.
n Loosen the screws of the terminal
block and insert the wires in the
respective terminals.
o Tighten the screws.
Important: The red jumper wire between Rh and Rc terminals must
be removed in a 5-wire installation.
2.3.1 2-wire Heating
2.3.2 2-wire Cooling
2.3.3 3-wire Heating
2.3.4 3-wire Cooling
2.3.5 4-wire Heating and Cooling
2.3.6 5-wire Heating and Cooling
Note: Remove the red jumper wire between terminals Rc and Rh.
2.4 Remote Control Input
(
TH148LE only
)
The TH148LE thermostat has an input to which a CT240 telephone
controller (optional) or any other remote control system (e.g., home
automation) can be connected. When the input receives a
12-VDC signal, the thermostat switches from its current mode to the
unoccupied mode and vice versa when the signal is removed.
The unoccupied mode can be used to re-adjust the temperature to
save energy when you are away for an extended period of time. To
set the unoccupied mode temperature, see section 4.
2.4.1 Connecting to CT240
Connect TH148LE terminals UN and UN to
CT240 terminals A and C (no polarity to observe).
2.4.2 Connecting to a Home Automation System
Connect TH148LE terminals UN and UN to a 12-
VDC circuit as shown.
2.5 Setting JP2 Jumper
The jumper specifies how the fan will operate when it is placed in
automatic mode.
Terminals Description Wire labels
Rh Heating power supply Rh, R, 4, V
Rc Cooling power supply Rc, R
W Heating signal W, W1, H
Y Cooling signal Y, Y1, M
GFan G, F
Un / Un Input for a remote control device (TH148LE only) -
Heat relay
Cool relay
Fan relay
Heat relay
Cool relay
Fan relay
HE
Place the jumper in this position if you
have an electric furnace.
HG
Leave the jumper in this position if you
have a gas or fuel oil furnace.
Heat relay
Cool relay
Fan relay
Fan relay
Cool relay
Heat relay
JP2 jumper
400-147-010-C (TH147_TH148 NP Aube) ENG.fm Page 2 Monday, November 27, 2006 10:41 AM