35
COOLING CONFIGURATION
Relevant configurations for mechanical cooling are located at the
local display under Configuration
COOL. See Table 36. These
"MM" points are only shown for units with Design Series 1, 2, and
3. For Design Series 4 and above, the points for the Outdoor VFD
are called "OV" points rather than "MM" points. (M.M. is only ap-
plicable for factory-installed Motor Master Option unit. OV.EN is
only for Greenspeed or Low Ambient option unit.)
Capacity Threshold Adjust (Z.GN)
This configuration is used for units using the “SumZ” algorithm
for cooling capacity control (Configuration
UNIT
C.TYP =
1, 2, 3, or 4). The configuration affects the cycling rate of the cool-
ing stages by raising or lowering the threshold that demand must
rise above in order to add or subtract a stage of cooling.
Normally this configuration should not require any tuning or ad-
justment. If there is an application where the unit may be signifi-
cantly oversized and there are indications of high compressor cy-
cles, then the Capacity Threshold Adjust (Z.GN) can be used to
adjust the overall logic gain. Normally this is set to 1.0, but it can
be adjusted from 0.5 to 4.0. As the value of Z.GN is increased, the
cycling of cooling stages will be slowed.
Compressor Lockout Temperature (MC.LO)
This configuration defines the outdoor air temperature below
which mechanical cooling is locked out. To make proper use of
Motormaster or Greenspeed/low ambient control, it will be neces-
sary for an operator to manually change this setting based on the
intended operational ambient condition. This configuration will
have a range of –20 to 55°F and have a default of 40°F.
Fan-Off Delay, Mech Cool (C.FOD)
After a mechanical cooling cycle has ended, this is the delay in
seconds that the supply fan will continue to operate.
Min. Load Valve (HGBP)? (MLV)
This configuration instructs the control as to whether a mini-
mum load valve has been installed and will be controlled by
the compressor staging routine.
NOTE: If the unit is configured for a Digital Scroll (Configura-
tion
COOL
DS.EN = YES) or Minimum Load Valve (Con-
figuration
COOL
MLV = ENABLE), then circuit A is al-
ways the lead circuit regardless of the setting of this configuration.
This configuration must be set to 1 (CIRCUIT A) for size 30 to 60
units if a factory-installed Motormaster V operation control is in-
stalled on the unit. If the unit is configured for the Humidi-MiZer
®
adaptive dehumidification system, then circuit B automatically be-
comes the lead circuit when the unit enters into one of the Humidi-
MiZer modes (dehumidification or reheat). The unit will immedi-
ately start a circuit B compressor when a Humidi-MiZer mode is
initiated.
Table 36 — Cooling Configuration
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
COOL COOLING CONFIGURATION
Z.GN Capacity Threshold Adjst –10 to 10 Z_GAIN 1
MC.LO Compressor Lockout Temp –20 to 55 dF OATLCOMP 40
C.FOD Fan-Off Delay, Mech Cool 0 to 600 sec COOL_FOD 60
MLV Min. Load Valve (HGBP)? Yes/No MLV_SEL No
DS.EN Enable Digital Scroll? Yes/No DIGCMPEN No
DS.MC DS Min Digital Capacity 25 to 100 % MINCAPDS 50
DS.AP Dig Scroll Adjust Delta 0 to 100 % DSADJPCT 100
DS.AD Dig Scroll Adjust Delay 15 to 60 sec DSADJDLY 20
DS.RP Dig Scroll Reduce Delta 0 to 100 % DSREDPCT 6
DS.RD Dig Scroll Reduce Delay 15 to 60 sec DSREDDLY 30
DS.RO Dig Scroll Reduction OAT 70 to 120 dF DSREDOAT 95
DS.MO Dig Scroll Max Only OAT 70 to 120 dF DSMAXOAT 105
HPSP Head Pressure Setpoint 80 to 150 dF HPSP 110
LASP Low Ambient Set Point 70 to 150 dF LASP 100
M.M. Motor Master Control ? Yes/No MOTRMAST No
MM.OF Motor Master Setpoint Offset 20 to 20 dF MMSPOFST –10
MM.RR Motor Master PD Run Rate 10 to 120 sec MM_RATE 10
MM.PG Motor Master Proportional Gain 0.0 to 5 MM_PG 1
MM.DG Motor Master Derivative Gain 0 to 5 MM_DG 0.3
MM.TI Motor Master Integration Time 0 to 50 MM_TI 30
A1.EN Enable Compressor A1 Enable/Disable CMPA1ENA Enable
A2.EN Enable Compressor A2 Enable/Disable CMPA2ENA Enable
B1.EN Enable Compressor B1 Enable/Disable CMPB1ENA Enable
B2.EN Enable Compressor B2 Enable/Disable CMPB2ENA Enable
CS.A1 CSB A1 Feedback Alarm Enable/Disable CSB_A1EN Enable
CS.A2 CSB A2 Feedback Alarm Enable/Disable CSB_A2EN Enable
CS.B1 CSB B1 Feedback Alarm Enable/Disable CSB_B1EN Enable
CS.B2 CSB B2 Feedback Alarm Enable/Disable CSB_B2EN Enable
REV.R Rev. Rotation Verified? Yes/No REVR_VER No
H.SST Hi SST Alert Delay Time 5 to 30 min HSSTTIME 10
OV.DB Outdoor VFD SCT DeadBand 0 to 20 dF OV_SCTDB 2
OV.RH Outdoor VFD Dehum-RH SPD 0 to 100 % OV_RH 50
LA.ST OV MinStartSpeed Low Amb 0 to 100 % OV_STMIN 12
OV.EN Outdoor VFD Enable No/Yes OV_ENA
ODV.A OUTDOOR VFD-A CONFIGS
N.VLT OV-A Nominal Motor Volts 0 to 999 OVA_NVLT
N.AMP OV-A Nominal Motor Amps 0 to 999 OVA_NAMP
N.FRQ OV-A Nominal Motor Freq 10 to 500 OVA_NFRQ
N.RPM OV-A Nominal Motor RPM 50 to 30000 OVA_NRPM
N.PWR OV-A Nominal Motor HPwr 0 to 500 OVA_NPWR
M.DIR OV-A Motor Direction 0=FORWARD, 1=REVERSE OVA_MDIR
ACCL OV-A Acceleration Time 0 to 1800 OVA_ACCL
DECL OV-A Deceleration Time 0 to 1800 OVA_DECL
SW.FQ OV-A Switching Frequency 0 to 3 OVA_SWFQ
ODV.B OUTDOOR VFD-B CONFIGS
N.VLT OV-B Nominal Motor Volts 0 to 999 OVB_NVLT
N.AMP OV-B Nominal Motor Amps 0 to 999 OVB_NAMP
N.FRQ OV-B Nominal Motor Freq 10 to 500 OVB_NFRQ
N.RPM OV-B Nominal Motor RPM 50 to 30000 OVB_NRPM
N.PWR OV-B Nominal Motor HPwr 0 to 500 OVB_NPWR
M.DIR OV-B Motor Direction 0=FORWARD, 1=REVERSE OVB_MDIR
ACCL OV-B Acceleration Time 0 to 1800 OVB_ACCL
DECL OV-B Deceleration Time 0 to 1800 OVB_DECL
SW.FQ OV-B Switching Frequency 0 to 3 OVB_SWFQ
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