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Enable Digital Scroll (DS.EN)
This configuration instructs the unit controls as to whether a
digital scroll compressor is installed. If set to YES, the com-
pressor will be controlled by the compressor staging routine
and SUMZ Cooling Algorithm. The digital scroll compressor
location will be based on unit size according to the following
table:
DS Min Digital Capacity (DS.MC)
This configuration defines the minimum capacity the digital
scroll compressor is allowed to modulate to. The digital scroll
compressor modulation range will be limited from DS.MC to
100%.
Digital Scroll Adjust Delta (DS.AP)
This configuration defines the maximum capacity the digital
scroll will be allowed to change per request by the SUMZ
Cooling Algorithm.
Digital Scroll Adjust Delay (DS.AD)
This configuration defines the time delay in seconds between
digital scroll capacity adjustments.
Digital Scroll Reduce Delta (DS.RP)
This configuration defines the maximum capacity the digital
scroll will be allowed to decrease per request by the SUMZ
Cooling Algorithm when OAT is greater than Configuration
COOL
DS.RO. This ramped reduction is only imposed
on a decrease in digital scroll capacity. An increase in capacity
will continue to follow the value defined by Configuration
COOL
DS.AP.
Digital Scroll Reduce Delay (DS.RD)
This configuration defines the time delay, in seconds, between
digital scroll capacity reduction adjustments when OAT is
greater than Configuration
COOL
DS.RO. This ramped
reduction is only imposed on a decrease in digital scroll capac-
ity. An increase in capacity will continue to follow the value
defined by Configuration
COOL
DS.AD.
Digital Scroll Reduction OAT (DS.RO)
Under certain operating conditions, a sharp decrease in digital
scroll capacity can result in unstable unit operation. This con-
figuration defines the outdoor-air temperature above which a
reduced capacity (Configuration
COOL
DS.RP) and
time delay (Configuration
COOL
DS.RD) will be im-
posed on a digital scroll capacity reduction. This ramped re-
duction is only imposed on a decrease in digital scroll capacity.
An increase in capacity will continue to follow the values de-
fined by Configuration
COOL
DS.AP and Configura-
tion
COOL
DS.AD.
Digital Scroll Max Only OAT (DS.MO)
This configuration defines the outdoor-air temperature above
which the digital scroll will not be allowed to modulate. The
digital scroll will be locked at 100% above this outdoor-air
temperature.
Head Pressure Setpoint (HPSP)
This is the head pressure setpoint used by the ComfortLink
control during condenser fan staging and maintaining head
pressure control. This configuration will have a range of 80 to
150°F and have a default of 110°F.
Motormaster Control (M.M.)
The Motormaster control configuration (M.M.) Units with fac-
tory installed Motormaster V speed control option, this config-
uration must be set to YES. See “HEAD PRESSURE CON-
TROL” on page 46 and Appendix F for more information.
NOTE: The non-factory-installed Motormaster V speed con-
trol accessory is a completely self-contained device and is not
managed by the unit's ComfortLink controller.
Motormaster Setpoint Offset (MM.OF)
This value is added to HPSP in order to calculate the Motor-
master setpoint MM_SP. This value will have a range of –20 to
20 and a default of –10.
Motormaster PD Run Rate (MM.RR)
This is the number of seconds between execution of the Motor-
master ComfortLink PD routine. This value will have a range
of 10 to 120 and a default of 10.
Motormaster Proportional Gain (MM.PG)
This is the proportional gain for the Motormaster control PD
control loop. This value will have a range of 0.0 to 5 and a de-
fault of 1.
Motormaster Derivative Gain (MM.DG)
This is the derivative gain for the Motormaster control PD control
loop. This value will have a range of 0 to 5 and a default of 0.3.
Motormaster Integration Time (MM.TI)
This is the integration time constant for the Motormaster con-
trol PD control loop. This values will have a range of 0 to 50
and default of 30.
Enable Compressor A1 (A1.EN)
This configuration is used to disable the A1 compressor in case
of failure.
Enable Compressor A2 (A2.EN)
This configuration is used to disable the A2 compressor in case
of failure.
Enable Compressor B1 (B1.EN)
This configuration is used to disable the B1 compressor in case
of failure.
Enable Compressor B2 (B2.EN)
This configuration is used to disable the B2 compressor in case
of failure.
CSB A1 Feedback Alarm (CS.A1)
This configuration is used to enable or disable the compressor
A1 feedback alarm. This configuration must be enabled at all
times.
CSB A2 Feedback Alarm (CS.A2)
This configuration is used to enable or disable the compressor
A2 feedback alarm. This configuration must be enabled at all
times.
CSB B1 Feedback Alarm (CS.B1)
This configuration is used to enable or disable the compressor
B1 feedback alarm. This configuration must be enabled at all
times.
CSB B2 Feedback Alarm (CS.B2)
This configuration is used to enable or disable the compressor
B2 feedback alarm. This configuration must be enabled at all
times.
Reverse Rotation Verified? (REV.R)
If this configuration is set to NO, then after a power up, in the
normal run mode, the control will check the suction pressure on
the first circuit that is energized after 5 seconds of run time. If
the control does not see a sufficient decrease in suction pressure
UNIT SIZE DIGITAL SCROLL COMPRESSOR
20 B1
25 B1
27 B1
30 A1
35 A1
40 A1
50 A1
60 A1
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