Unit Description 5-21
Modulation (SLX Spectrum ETV, SLXe Spectrum, SLXi Spectrum)
The modulation temperature range is factory set at -9 C to 27 C. The lower limit (-9 C) is adjustable through the keypad to -4C.
The upper limit (27 C) can be field adjusted from 27 C down to -9 C. Ito -4 C or -9 C depending on setting. If the upper limit is
set to -4 C or -9 C, the modulation mode is completely disabled.
The Modulation mode is disabled when the controller setpoint is above or below the modulation temperature range, when the
unit is in Defrost, and when the CYCLE-SENTRY switch is in the CYCLE-SENTRY position (except in Cycle-Sentry Fresh
range).
Note: Modulation is only available when operating with Zone 1 Only switched on. If operating SZC (Simple Zone Control)
mode, the controller sees Zone 2 as switched on, so modulation will not be available.
Typical (SLX/SLXe/SLXi Spectrum) - Zone 1 on Cool, Zone 2 on Cool
Z-1 Zone 1 Evaporator (Host Unit): COOL
1. Liquid Line Solenoid (LLS) – Open
2. Liquid Return Check Valve (LRCV) – Closed
3. Suction Line Check Valve (SLCV) – Open
4. Suction Line Solenoid (SLS) – Open
5. Hot Gas Solenoid (HGS) – Closed
6. Condenser Inlet Solenoid (CIS) – Closed**
7. Condenser Inlet Check Valve (CICV) – Closed
8. Receiver Tank Pressure Solenoid (RTPS) – Open**
9. Condenser Check Valve (CCV) – Closed
10. Bypass Hand Valve
11. Purge Valve (PV) – Open**
12. Purge Check Valve (PCV) – Open
13. Hot Gas Bypass Solenoid (HGBP)
14. Electronic Throttling Valve (ETV)
Z-2 Zone 2 Evaporator***: COOL
1C. Zone 2 Liquid Line Solenoid (LLS2) – Open
2C. Zone 2 Liquid Return Check Valve (LRCV2) – Closed
3C. Zone 2 Suction Line Check Valve (SLCV2) – Open
4C. Zone 2 Suction Line Solenoid (SLS2) – Open
5C. Zone 2 Hot Gas Solenoid (HGS2) – Closed
To Next Page
Loading...
Need help?
General
