Single Point Boxes Without Fuses; Low-Voltage Control Connections; Economi$Er X (Factory Option); System Components - Carrier WeatherMaker 50TCQ07 Installation Instructions Manual

CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 39 — Typical Single Point Installation

SINGLE POINT BOXES WITHOUT FUSES

Unit heater applications not requiring supplemental fuses re-
quire a special single point box without any fuses. The acces-
sory single point boxes contain a set of power taps and pigtails
to complete the wiring between the single point box and the
unit's main control box terminals. Refer to accessory heater
and single point box installation instructions for details on tap
connections.

LOW-VOLTAGE CONTROL CONNECTIONS

Run the low-voltage control leads from the heater module(s) -
VIO and BRN (two of each if two modules are installed; iden-
tify for Module #1) - to the 4-pole terminal board TB4 located
on the heater bulkhead to the left of Heater #1. Connect the
VIO leads from Heater #1 and Heater #2 to terminal TB4-1.
Connect the BRN leads to terminal TB4-3. See Fig. 40.
DEFROST
BOARD
E-HEAT ORN
P3-3 BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 40 — Accessory Electric Heater Control
Connections
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
®
Economi$er X (Factory Option)
The EconoMi$er X system is an expandable economizer con-
trol system, which includes a W7220 economizer module (con-
troller) with an LCD and keypad (See Fig. 41). The W7220 can
be configured with optional sensors.
Fig. 41 — W7220 Economizer Module
The W7220 economizer module can be used as a stand-alone
economizer module wired directly to a commercial set-back
space thermostat and sensors to provide outside air dry-bulb
economizer control.
The W7220 economizer module can be connected to optional
sensors for single or differential enthalpy control. The W7220
economizer module provides power and communications for
the sensors.
The W7220 economizer module automatically detects sensors
by polling to determine which sensors are present. If a sensor
loses communications after it has been detected, the W7220
economizer controller indicates a device fail error on its LCD.

SYSTEM COMPONENTS

The EconoMi$er X system includes an economizer module,
20k mixed air sensor, damper actuator, and either a 20k out-
door air temperature sensor or S-Bus enthalpy sensors.
Economizer Module
The module is the core of the EconoMi$er X system. The
module is mounted in the unit's control box, and includes the
user interface for the system. The W7220 economizer module
provides the basic inputs and outputs to provide simple
economizer control. When used with the optional sensors, the
economizer module provides more advanced economizer
functionality.
S-Bus Enthalpy Control Sensors
The sensor is a combination temperature and humidity sensor
which is powered by and communicates on the S-Bus. Up to
three sensors may be configured with the W7220 economizer
module.
CO Sensor (optional)
2
The CO sensor can be added for Demand Controlled Ventila-
2
tion (DCV).

SPECIFICATIONS

W7220 Economizer Module
The module is designed for use with 2 to 10 vdc or bus com-
municating actuator. The module includes terminals for CO
sensor, Mixed Air sensor, and an Outdoor Dry Bulb sensor. En-
thalpy and other options are available with bus sensors.
23
2