Electra EMD 27, Руководство по обслуживанию, Страница: 58 / 72

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CONTROL SYSTEM
Revision Y05-01 Service Manual - EMD Series
5 Automatic Cooling or Heating
5.1 Automatic Cooling or Heating - General
The Auto Mode is for model with compressor and the WVL-RH only. The WVL-ST, RC and SH units do not work in Auto Mode.
5.1.1 Mode Definition
Mode: Auto
Temp: Selected
desired temperature
Fan: Any
Timer: Any
I Feel:
On or Off
5.1.2 Switching-temperature between Cooling and Heating is SPT
r
3
o
c.
5.1.3 When the Auto Mode is started with SPT +/-0
o
c, the unit will not select Auto Heat or Auto Cool mode
immediately. Instead, the unit will be in a temporary Fan Mode with IFAN operating at low speed. The proper
Auto Heat mode or Auto Cool will be started whenever the RT reaches SPT-1
o
c or SPT+1
o
c respectively.
5.1.4 For RC & SH units, Mode change between Auto Heat & Auto Cool Modes is possible only after the COMP has
been OFF during the last T minutes.
Mode Change time, T
Auto Cool to Auto Heat 3 min
Auto Heat to Auto Cool 4 min
5.1.5 For RH and WVL-RH units, Mode change between Auto Heat & Auto Cool Modes is possible after the
COMP/HEs have been OFF during the last T minutes.
Mode Change time, T
Auto Cool to Auto Heat COMP off for 3 min
Auto Heat to Auto Cool HEs off for 3 min
5.1.6 When unit is changed form Cool/Dry mode to Auto Mode, the unit will continue to operate at (Auto) Cool Mode
until the conditions for switching from Auto Cool to Auto Heat are satisfied.
Similarly, when unit is changed from Heat Mode to Auto Mode, the unit will continue to operate at (Auto) Heat Mode until the
conditions for switching from Auto Heat to Auto Cool are satisfied.