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
Summary of Contents for WEATHERMAKER 48A2020
Page 112: ...112 Fig 20 Typical Main Control Box Wiring Schematic 48 50A Units ...
Page 113: ...113 Fig 21 Typical Auxiliary Control Box Wiring Schematic ...
Page 114: ...114 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown ...
Page 115: ...115 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown TO NEXT PAGE ...
Page 116: ...116 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont ...
Page 117: ...117 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown ...
Page 118: ...118 Fig 25 Typical Controls Option Wiring Schematic SW1 SW2 OR DEHUMIDIFY SWITCH ...
Page 119: ...119 Fig 26 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown ...
Page 120: ...120 Fig 27 Typical Power Schematic of Greenspeed Low Ambient Option 48 50A 060 Unit Shown ...
Page 121: ...121 Fig 28 Typical Small Chassis Component Location Size 020 035 Units ...
Page 122: ...122 Fig 29 Typical Large Chassis Component Locations Size 040 060 Units ...
Page 185: ...185 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716 ...