Bryant LEGACY 580J*20M Series, Installation Instructions Manual

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26
EconoMi$er ® X (Factory-Installed Option)
PRODUCT DESCRIPTION — The EconoMi$er X system
is an expandable economizer control system, which includes a
W7220 economizer module (controller) with an LCD and key-
pad (see Fig. 34). The W7220 can be configured with optional
sensors.
Fig. 34 — 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 sen-
sors by polling to determine which sensors are present. If a sen-
sor loses communications after it has been detected, the W7220
economizer controller indicates a device fail error on its LCD.
SYSTEM COMPONENTS — The EconoMi$er X system in-
cludes an economizer module, 20k mixed air sensor, damper ac-
tuator, and either a 20k outdoor air temperature sensor or S-Bus
enthalpy sensors.
Economizer Module is the core of the EconoMi$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 are a combination tempera-
ture and humidity sensor which is powered by and communi-
cates on the S-Bus. Up to three sensors may be configured with
the W7220 economizer module. See page 27 for details.
CO
2
Sensor (optional) can be added for Demand Controlled
Ventilation (DCV).
SPECIFICATIONS
W7220 Economizer Module is designed for use with 2 to 10
Vdc or bus communicating actuator. The module includes termi-
nals for CO
2
sensor, Mixed Air sensor, and an outdoor dry bulb
sensor. Enthalpy and other options are available with bus
sensors.
User Interface provides status for normal operation, setup pa-
rameters, checkout tests, and alarm and error conditions with a
2-line 16 character LCD display and four button keypad.
Electrical
Rated Voltage — 20 to 30 Vac RMS, 50/60 Hz
Transformer — 100 va maximum system input
Nominal Power Consumption (at 24 Vac, 60 Hz) — 11.5 VA
without sensors or actuators
Relay Digital Output Rating at 30 Vac (maximum power
from Class 2 input only) — 1.5A run:
3.5A inrush at 0.45PF (200,000 cycles) or
7.5A inrush at 0.45PF (100,000 cycles)
External Sensors Power Output — 21 Vdc ± 5% at 48mA
INPUTS
Sensors
NOTE: A Mixed Air (MA) analog sensor is required on all
W7220 units; either an Outdoor Air (OA) sensor for dry bulb
change over or an OA bus sensor for outdoor enthalpy change
over is required in addition to the MA sensor. An additional
Return Air (RA) bus sensor can be added to the system for dif-
ferential enthalpy or dry bulb changeover. For differential dry
bulb changeover a 20k ohm sensor is required in the OA and a
bus sensor in the RA. DIP switch on RA bus sensor must be set
in the RA position.
Dry Bulb Temperature (optional) and Mixed Air (required),
20k NTC
2-wire (18 to 22 AWG);
Temperature range -40 to 150 F (-40 to 65 C)
Temperature accuracy -0 F/+2 F
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range -40 to 150 F (-40 to 65 C)
Temperature accuracy -0 F/+2F
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (3) S-Bus sensors may be connected to the
W7220 economizer module. For outdoor air (OA), return air
(RA) and discharge (supply) air (DA).
4 Binary Inputs — 1-wire 24 Vac + common GND (see page 27
for wiring details). 24 Vac power supply: 20 to 30 Vac 50/60 Hz;
100 VA Class 2 transformer.
OUTPUTS
Actuator Signal: 2-10 Vdc; minimum actuator impedance is 2k
ohm; bus two-wire output for bus communicating actuators.
Exhaust fan, Y1, Y2 and AUX1 O:
All Relay Outputs (at 30 Vac):
Running: 1.5A maximum
Inrush: 7.5A maximum
ENVIRONMENTAL
Operating Temperature:
-40 to 150 F (-40 to 65 C).
Exception of display operation down to -4 F with full
recovery at -4 F from exposure to -40 F
Storage Temperature:
-40 to 150 F (-40 to 65 C)
Shipping Temperature:
-40 to 150 F (-40 to 65 C)
Relative Humidity:
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS — Use
Fig. 35 and Tables 6 and 7 to locate the wiring terminals for the
Economizer module.
IMPORTANT: All inputs and outputs must be Class 2
wiring.