Johnson Controls YVAHP072B31S, Service Manual

Page: 1081 / 1796

Service Manual
2-161
OPERATION
10.1.4 External Power Saving Control
Processing
During Outdoor Capacity Control setting in
process of the central controller or outdoor unit
The icon “Ext. Sav” will display as ON.
However, if the controller is set for indoor unit
rotation or intermittent operation control, the icon
will not display as ON.
10.1.5 Thermo-Controller
The fan speed is changed to “LOW” at the
thermo-controller actuation. However, the
indication is not changed. (It changes only in the
heating operation mode.)
10.1.6 Defrosting
Only device using both Cooling/Heating
(included multi Cooling/Heating device
for building)
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operation will continue and the defrosting will
stop when complete.
10.1.7 Operation Control
Power Activation
The icon “Preheating” will display as ON.
The compressor is preheating.
Because the unit cannot operate beyond four
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of the outdoor unit in a Cooling/Heating season.
Apply power to the outdoor unit(s) at least
12 hours prior to operation of the system for
preheating of the compressor oil.
Activating in Hot Start (only for Heating Mode)
The icon “HOT-START” will display as ON.
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unit is not operating.
In an instance where the operation mode set by
the central station is different from the operation
mode of the outdoor unit
(when the outdoor unit is operating in a mode
other than heat/cool simultaneous operation.)
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“Other remote are in HEAT setting” will be
À ickering.
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The icon “Defrost” will display as ON and the
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The unit will be situated so the air will blow
horizontally.
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