Manual 2100-671C
Page
15 of 59
Heating
The unit can be equipped with 0, 1 or 2 stages of
electric heat (see Figure 16).
Electronic Expansion Valve (EEV)
EEV Components
Electronic Expansion Valve
The electronic expansion valve is a stepper motor that
is controlled with a step output from the controller. The
valve is capable of 480 steps represented by a 0-100%
signal on the controller. The motor drives a needle valve
that regulates the flow of refrigerant.
EEV Instructions for Vacuum, Reclaim, Charge Unit
The electronic expansion valve moves to the 20% open
position when the unit is not actively cooling. The
valve may need to be manually positioned for service or
troubleshooting. The valve can be positioned by using a
menu override.
To manually override the valve:
NOTE:
The unit must be off to perform this override.
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to
I/O Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Manual EEV
;
press ENTER key.
5. Press UP or DOWN keys to scroll to
EEV Circuit 1
or
EEV Circuit 2.
6. Press ENTER key to scroll to
Service Pos
(see
Figure 17).
FIGURE 16
Heating
Heating Deadband
Heating
Off
58.0°F
58.5°F
59.0°F
59.5°F
60.0°F
60.5°F
61.0°F
61.5°F
62.0°F
Electric Heater 2
Electric Heater 1
FIGURE 17
Overriding EEV Output
FIGURE 15
Cooling (without Economizer)
Cooling Deadband
Off
Cooling
75.0°F 75.5°F 76.0°F 76.5°F 77.0°F 77.5°F 78.0°F 78.5°F 79.0°F 79.5°F 80.0°F 80.5°F 81.0°F
Compressor 1 Stage 1
Compressor 2
Compressor 1 Stage 2
7. Press UP or DOWN keys to adjust to the desired
value.
Содержание MEGA-TEC W090A
Страница 2: ......
Страница 59: ...Manual 2100 671C Page 57 of 59 I O Layout...
Страница 60: ...Manual 2100 671C Page 58 of 59...
Страница 61: ...Manual 2100 671C Page 59 of 59...
Страница 62: ......
Страница 111: ...Manual 2100 479 Page 6 of 11 FIGURE 1 TYPICAL AIR CONDITIONING SYSTEM COOLING CYCLE MIS 369...
Страница 112: ...Manual 2100 479 Page 7 of 11 FIGURE 2 TYPICAL HEAT PUMP SYSTEM COOLING CYCLE MIS 368...
Страница 118: ......
Страница 122: ...Manual 2110 1451D Page 4 of 28 ECONOMIZER INTAKE HOODS 7 2 4 5 6 8 3 1 4 SEXP 899...
Страница 124: ...Manual 2110 1451D Page 6 of 28 SYSTEM COMPONENTS SEXP 898 A 2 15 6 10 14 5 8 13 11 3 7 9 10 1 4 12 16 11...
Страница 126: ...Manual 2110 1451D Page 8 of 28 FAN SYSTEM COMPONENTS 2 5 3 7 2 2 8 4 1 7 9 2 10 5 6 6 9 7 6 12 6 7 11 SEXP 904 7...
Страница 128: ...Manual 2110 1451D Page 10 of 28 SENSORS AND PERIPHERAL DEVICES 7 2 12 10 8 4 4 3 10 12 1 9 7 5 6 11 13 SEXP 905...
Страница 142: ...Manual 2110 1451D Page 24 of 28 INTAKE DAMPER ASSEMBLY SEXP 900 12 17 7 10 13 3 3 6 5 11 4 3 14 8 9 1 15 2 16 18 17...
Страница 144: ...Manual 2110 1451D Page 26 of 28 EXHAUST DAMPER ASSEMBLY 13 17 6 12 16 14 9 5 18 11 4 1 7 2 SEXP 901 7 8 3 1 18 10 15...
Страница 149: ......
Страница 157: ......