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CBX40UHV

H−AIR HANDLER CONTROL 9−PIN CONNECTOR

1. Air Handler ONLY − 2−wire harness (Wired to points 7

and 8) from the factory provides 230 volt power to Air

Handler Control.

2. Air Handler with ECB40 Electric Heat − 8−wire harness

(Wired as noted in table 2)

NOTE − See Figure 4

Table 2. Stages

Position

& Wire

Color

Function / Description

1 red Heat stage 1 relay coil

2 orange Heat stage 2 relay coil

3 yellow Relay coil return

4 black Heat stage 3 relay coil

5 brown Heat stage 4 relay coil

6 blue Heat stage 5 relay coil

7 black L1 230VAC supply from heater kit

8 red L2 230 VAC supply from heater kit

9 Not Used

THERMOSTAT CONNECTIONS

Table 3 (CBX40UHV−XXX−230−6−01 and −02)

Label

Function

First−stage heating demand.

Second−stage heating demand. W1 input must be active to

recognize second−stage heat demand. .

Third−stage heating demand. W1 and W2 inputs must be

active to recognize third stage heat demand.

Fan control input.

Y1 and

First and second−stage cooling inputs.

24VAC Common.

24VAC power.

24VAC output for Humiditrol

24VAC output for humidification.

For Future Use ONLY. (DO NOT USE)

Reversing Valve input. (Energized by thermostat in cooling

mode or by heat pump defrost control in defrost mode.)

Blower speed control input for Harmony III

Zoning or ther-

mostat de−humidification control.

Table 4. Air Handler Control Connections 

Communicating (CBX40UHV−XXX−230−6−02)

Label Label Function

Thermostat

R 24VAC

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

Outdoor Unit

R 24VAC

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

Link

Not used.

i−

Table 5. Run Length  Communicating

(CBX40UHV−XXX−230−6−02)

Wire Run Length AWG # Insulation/Core Types

Maximum length of wiring

for all connections on the

RSBus is limited to 1500

feet (457 meters).

Color−coded, temperature

rating 95

F (35

C) minimum,

solid core. (Class II Rated

Wiring)

Table 6. Run Length  Non−Communicating

(CBX40UHV−XXX−230−6−01 and −02)

Wire Run Length AWG # Insulation/Core Types

Less than 100’ (30m) 18

Color−coded, temperature

rating 95

F (35

C) minimum,

solid core. (Class II Rated

Wiring)

More than 100’ (30m) 16

Brand	Lennox
Model	CBX40UHV Series
Category	Air Handlers
Language	English

Lennox CBX40UHV Series Unit Information

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