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
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