Honeywell W7080A User Manual

Honeywell
THIS SOLID-STATE SYSTEM IS A COMPONENT
FOR COMPONENT FIELD REPLACEMENT
FOR THE RANCO EA3 LODAPT SYSTEM. THE
BASIC SYSTEM CONTROLS UP TO 12 ZONE
DAMPERS, 3 HEATING STAGES, 3 COOLING
STAGES, AN INTEGRATED ECONOMIZER,
AND MODULATING VALVES FOR HOT WATER
AND CHILLED WATER. OPTIONAL UNITS
PROVIDE CONTROL OF UP TO 12ADDlTlONAL
ZONES, 5 STAGES OF ELECTRIC HEAT,
VARIABLE AIR VOLUME (VAV) SYSTEM FAN,
AND A FOURTH STAGE OF COOLING.
0 Modulated DC voltage signal from zone
thermostat, modified by zone discharge
sensor, provides direct control of
associated zone damper.
•i Pilot duty SPDT relays control heating
and cooling stages.
0 Economizer uses M745K or M745L motor
to provide true first stage of cooling, using
outdoor air whenever possible.
•i System switches all stages off when
power is intermpted; switches all stages
on when power is restored. Compressor
turn on time delays must be incorporated
for each compressor.
0 Power supplies in W7080A Load Analyzer
and W7084A Zone Adder are short-circuit
protected. Short circuits of 24 Vdc from
load analyzer or zone adder will not
damage their power supplies.
0 Night setback and cooling shut-down for
individual or all zones by adding a time
clock.
HG/KH
Form
Number 63-4179
7/90
© Honeywell 1990

Honeywell W7080A Specifications

General

Brand	Honeywell
Model	W7080A
Category	Control Systems
Language	English

Summary

Honeywell Multizone Control System Overview

W7080A Load Analyzer Functionality

Provides SPDT relay switching for heating/cooling stages and modulating output.

Economizer and Cooling Control

Uses M745K/M745L motor for first stage cooling with outdoor air.

System Power Interruption Behavior

System switches stages off upon power interruption and on upon restoration.

Power Supply Protection

Power supplies are short-circuit protected against 24 Vdc shorts.

Night Setback and Cooling Shut-down

Enables night setback and cooling shut-down for zones via a time clock.

System Specifications and Components

System Component Descriptions

Details various system components including sensors, thermostats, limit controllers, and analyzers.

Electrical and Contact Ratings

Covers voltage, frequency, power consumption, and SPDT relay contact ratings.

System Input and Output Signals

Lists DC voltage signals for system inputs and outputs with relevant components.

Stage Differentials and Thermostat Dead Band

Explains stage differentials and thermostat dead band settings as depicted in Figure 1.

Economizer and Control Parameters

Economizer Mixed Air Limit

Outdoor air damper modulation based on mixed air temperature setpoint.

Integrator Minimum Output

Selectable minimum output for fan motor speed control.

Zone Discharge Sensor Authority

Defines how zone discharge sensor changes affect voltage.

Ambient Temperature Rise

Specifies operating and shipping temperature ranges.

Cold Deck Low Limit

Limits cold deck temperature to selectable setpoints.

Hot Deck High Limit

Limits hot deck temperature to selectable setpoints.

System Accessories and Important Notes

Transformer Usage and Isolation

Guidelines for transformer use, isolation, and grounding.

Motor and Linkage Components

Descriptions of damper linkage, valve linkage, and potentiometers.

Modulating Water Valves

Guidance on using valves with Super Modutrol motors.

Night Setback Resistor Values

Lists resistor values for achieving specific heating setbacks.

System Component Protection

Details on the metal cover for protecting system components.