Unit Description (Rev 6/98)
9
Modulation
Modulation is disabled if the setpoint is out of the modula-
tion range, if the unit is in defrost, or if the unit is in
CYCLE-SENTRY.
The lower limit of the modulation range is fixed at -5 C
(24 F). Setpoints below -5 C (24 F) disable modulation.
The upper limit of the modulation range is adjustable from
27 C (80 F) to -5 C (24 F). The default setting for the upper
limit is 27 C (80 F). Setpoints above this limit disable mod-
ulation.
If the upper limit of the modulation range is set at -5 C
(24 F), modulation is disabled.
No Modulation or Modulation Disabled
Units that are not equipped with modulation and units that
are equipped with modulation but have modulation disabled
use the following operating modes:
•
High Speed Cool
•
Low Speed Cool (or Null on Auto Start-Stop on tem-
perature rise only)
•
Low Speed Heat (or Null on Auto Start-Stop)
•
High Speed Heat
•
Defrost
Modulation Enabled
Units that are equipped with modulation and have modula-
tion enabled use the following operating modes:
•
High Speed Cool
•
Low Speed Cool
•
Low Speed Modulated Cool
•
Low Speed Modulated Heat
•
Low Speed Heat
•
High Speed Heat
•
Defrost
Defrost
Defrost mode can be initiated by the manual defrost switch,
air switch, or by the microprocessor defrost timer any time
the evaporator coil temperature is below 7.2 C (45 F). If the
unit is in the Null mode (Auto Start-Stop operation), manu-
ally initiating defrost will cause the unit to start and operate
in the defrost mode. When a defrost cycle is initiated, the
microprocessor energizes the damper solenoid, pilot sole-
noid and defrost light. The microprocessor maintains the in-
range signal during defrost.
The unit remains on defrost until the evaporator coil tem-
perature rises to 13.9 C (57 F) or the microprocessor defrost
timer terminates defrost after 30 or 45 minutes.
NOTE: The microprocessor will not respond to a tempera-
ture out-of-range condition for 45 minutes after the termi-
nation of a defrost cycle. This allows for normal
temperature recovery after the defrost cycle.
Содержание Super II SR+
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