Wiring, See “wiring” beginning – Honeywell PRESTIGE THX9321 User Manual

Page 135

THX9321 PRESTIGE

2.0 AND THX9421 PRESTIGE

IAQ WITH EIM

135

68-0311—02

WIRING

See Table 13 for Equipment Interface Module terminal descriptions and Table 14 for thermostat terminal descriptions.

* Remove jumpers when separate transformers are used.

†

See “Wiring IAQ Equipment or a Heat/Cool Stage to the Universal Terminals” beginning on page 149 or “Wiring IAQ Equipment or

a Heat/Cool Stage to the Universal Terminals” beginning on page 149.

‡

See “Dry Contact Alerts” beginning on page 95 for wiring Dry Contact Devices to display alerts.

Table 13. Equipment Interface Module Terminal Designation Descriptions.

Conventional System

Heat Pump

Terminal

Description

Terminal

Description

Common wire from 24 VAC transformer.

Power wire from 24 VAC transformer.

RH*

Heating power

RC*

Cooling power

Heat Stage 1

O/B

Changeover valve for heat pumps

Heat Stage 2

AUX 1

Backup Heat Stage 1/Emergency Heat Stage 1

Heat Stage 3

AUX 2

Backup Heat Stage 2/Emergency Heat Stage 2

Compressor Stage 1

Compressor Stage 2

Fan Relay

Connect to Economizer Module or Lighting Panel

(TOD).

L/A

Connect to Compressor Monitor, Zone Panel,

Economizer Module or Lighting Panel (TOD).

U1 / U1

†

U2 / U2

†

U3 / U3

†

Universal relay for humidification,

dehumidification, ventilation, or a stage of

heating/cooling. U terminals are dry contacts that

require power.

U1 / U1

†

U2 / U2

†

U3 / U3

†

Universal relay for humidification,

dehumidification, ventilation, or a stage of

heating/cooling. U terminals are dry contacts that

require power.

S1 / S1

‡

S2 / S2

‡

S3 / S3

‡

S4 / S4

‡

Universal input for a wired indoor sensor, outdoor

sensor, discharge sensor, return sensor, dry

contact device for alerts or dry contact device for

remote setback.