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12
PG 12
Humidifi er -
To use the /6 internal humidistat to control an external
humidifi er unit, connect it as shown. Connect the H
terminal to the control leg of the humidifi er relay. This
allows H to turn the humidifi er ON and Off.
De-Humidifi er -
To use the /6 internal humidistat to control an external
De-humidifi er unit, connect it as shown. Connect the DH
terminal to the control leg of the dehumidifi er relay. This
allows DH to turn the dehumidifi er ON and Off.
Fresh Air -
The Fresh Air feature uses the EX relay to control a baffl e
on a fresh external air source. Connect the 24VAC baffl e
to C and EX terminals.
BAFFLE
RH
FOR FRESH AIR BAFFLE
EX
R
C
/6
FURNACE
POWER
H or DH
To HUMIDIFIER
or
DEHUMIDIFIER
RELAY
RH
USING 24VAC ADAPTER
H or DH
R
C
/60
FURNACE
POWER
AC
ADPT
FOR EXTERNAL HUMIDIFIER
or DEHUMIDIFIER USING
H or DH
To HUMIDIFIER
or
DEHUMIDIFIER
RELAY
RH
FOR EXTERNAL HUMIDIFIER
or DEHUMIDIFIER USING
HVAC SYSTEM's 24
VAC
H or DH
R
C
/60
FURNACE
POWER
24VAC
13
PG 13
WIRE REFERENCE CHART
Your Wires LS-90 Terminal
R or V or VR RH and RC Single power for HEAT and COOL
RH or 4 RH Power for HEAT (RH not connected to RC jumper clip removed)
RC RC Power for COOL (RH not connected to RC jumper clip removed )
W W Heat control
W2 W2 2nd stage HEAT or heat pump auxiliary heat
W3 W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat
? A 3rd wire for zoned hot water heat (see zoned systems pg14)
Y Y COOL control or 1st stage compression for heat pump.
Y2 Y2 2nd stage COOL control or 2nd stage compression for a heat pump
G or F G FAN control
C or X C Common 24VAC power (to power thermostat ) NOTE: TRANE uses B for this connection
E n/a Emergency heat (do not connect, tape off)
L n/a System monitor (do not connect, tape off)
T n/a Outdoor sensor (do not connect, tape off)
H External Humidifi er
DH External De-Humidifi er
EX External fresh air baffl e
B or B Heat pump changeover (cool to heat, powered in heat)
O O Heat pump changeover (heat to cool, powered in cool)
B and O
IMPORTANT: If there are both B and O wires (Trane pump
products) DO NOT CONNECT B to B terminal, connect B to C
terminal. If not a Trane product tape off B.
Lennox Heat Pump
V or VR or R RH Power for HEAT
M or Y Y
Y or W or W2 W2
F or G G
R or O OX or X2 or C C
Trane Products [American Standard]
B C
W or W1 or X2 W2