Fan User Manual

172
YORK INTERNATIONAL
FORM 201.19-NM1 (204)
Micro Panel Contents
8.4 ELECTRONIC EXPANSION VALVE
ELECTRONIC EXPANSION VALVE
The Electronic Expansion Valve (EEV) is an electroni-
cally controlled expansion valve. The control algo-
rithms to control the EEV reside in the micorprocessor
software. The superheat setpoint can be programmed
on the control panel.
The purpose of the EEV is to meter a fl ow of liquid
refrigerant into the evaporator to maintain a superheat
FIG. 50 – ELECTRONIC EXPANSION VALVE
LD09132
120 VAC PILOT
SOLENOID
24 VAC HEAT
MOTOR
EXPANSION
VALVE
IN
OUT
setpoint. The refrigerant fl ow direction is designated
by an arrow on the expansion valve body.
There are two safeties associated with the EEV; Low
Superheat Cutout and Sensor Failure Cutout.