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.
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.
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.
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.
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
