Trane LS-90 manual De-Humidifier, Fresh Air, Wire Reference Chart

12

Humidifier -

To use the /6 internal humidistat to control an external humidifier unit, connect it as shown. Connect the H terminal to the control leg of the humidifier relay. This allows H to turn the humidifier ON and Off.

De-Humidifier -

To use the /6 internal humidistat to control an external

PG 12

FOR EXTERNAL HUMIDIFIER or DEHUMIDIFIER USING HVAC SYSTEM's 24VAC

/60

		RH H or DH
FURNACE R			To HUMIDIFIER
POWE R	C
			or
24VAC

De-humidifier unit, connect it as shown. Connect the DH terminal to the control leg of the dehumidifier relay. This allows DH to turn the dehumidifier ON and Off.

H or DH RELAY

DEHUMIDIFIER

Fresh Air -

The Fresh Air feature uses the EX relay to control a baffle on a fresh external air source. Connect the 24VAC baffle to C and EX terminals.

FOR FRESH AIR BAFFLE

/6

RH EX

FURNACE R	BAFFLE
POWER C

FOR EXTERNAL HUMIDIFIER or DEHUMIDIFIER USING USING 24VAC ADAPTER

/60

RH H or DH

FURNACE R	To HUMIDIFIER
POWER C
	or
AC	DEHUMIDIFIER
ADPT	H or DH
	RELAY

13

WIRE REFERENCE CHART

Your Wires R or V or VR RH or 4

RC

W

W2

W3

?

Y

Y2

G or F C or X E

L

T

H

DH

EX

Bor

O

B and O

Lennox Heat Pump

V or VR or R

M or Y

Y or W or W2

F or G

R or O

LS-90 Terminal

RH and RC Single power for HEAT and COOL

RH Power for HEAT (RH not connected to RC jumper clip removed)

RC Power for COOL (RH not connected to RC jumper clip removed )

W Heat control

W2 2nd stage HEAT or heat pump auxiliary heat

W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat

A3rd wire for zoned hot water heat (see zoned systems pg14)

YCOOL control or 1st stage compression for heat pump.

Y2 2nd stage COOL control or 2nd stage compression for a heat pump

GFAN control

CCommon 24VAC power (to power thermostat ) NOTE: TRANE uses B for this connection n/a Emergency heat (do not connect, tape off)

n/a System monitor (do not connect, tape off) n/a Outdoor sensor (do not connect, tape off) External Humidifier

External De-Humidifier External fresh air baffle

BHeat pump changeover (cool to heat, powered in heat)

O Heat pump changeover (heat to cool, powered in cool)

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.

RH Power for HEAT	Trane Products [American Standard]
	B	C
Y
	W or W1 or X2	W2
W2
G
OX or X2 or C	C	PG 13