![background image](http://html.mh-extra.com/html/carrier/weathermaker-48aj020/weathermaker-48aj020_operating-and-service-manual_2560309038.webp)
38
Table 45 — Setpoints
Table 46 — Supply Air Reset Configuration
Table 47 — Cooling Configuration
Capacity Threshold Adjust (
Z.GN
) — This configuration is
used for units using the “SumZ” algorithm for cooling capacity
control (
C
onfiguration
→
UNIT
→
C.TYP
= 1, 2, 3 or 5). The
configuration affects the cycling rate of the cooling stages by
raising or lowering the threshold that demand must build to in
order to add or subtract a stage of cooling.
Normally this configuration should not require any tuning or
adjustment. If there is an application where the unit may be sig-
nificantly oversized and there are indications of high compres-
sor cycles 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 config-
uration is the outdoor air temperature setting below which
mechanical cooling is locked out.
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 in-
structs the control as to whether a minimum load valve has
been installed and will be controlled by the compressor staging
routine.
MotorMaster Control? (
M.M
.
) — The condenser fan staging
control for the unit is managed directly by the
Comfort
Link™
control. There is no physical Motormaster® device in the
standard unit. The standard unit is capable of mechanical
cooling operation down to 35 F outdoor temperature. With the
addition of accessory Motormaster V speed control on the stage
1 condenser fan(s), mechanical cooling operation down to 0° F
outdoor temperature is possible. The accessory Motormaster V
speed control is a completely self-contained control and is not
controlled by the unit’s
Comfort
Link control. The Motormaster
control configuration (
M.M.
) only applies to the 060 size units.
On 060 size units with accessory Motormaster V speed control
installed, this configuration must be set to YES. On 060 size
units without accessory Motormaster V speed control installed
and on all 020-050 size units, this configuration must be set to
NO. On 051 and 060 size units with this configuration set to
NO, the
Comfort
Link control will control 3 stages of condenser
fan head pressure control. With this configuration set to YES,
the
Comfort
Link control will control 2 stages of condenser fan
head pressure control in addition to the Motormaster V speed
control accessory. See Head Pressure Control section, page 46,
for more information.
Head Pressure Set Point (
HPSP
) — This is the head pressure
set point used by the
Comfort
Link control during condenser
fan, head pressure control.
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.
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
OHSP
Occupied Heat Setpoint
40-99
dF
OHSP
68
OCSP
Occupied Cool Setpoint
40-99
dF
OCSP
75
UHSP
Unoccupied Heat Setpoint
40-99
dF
UHSP
55
UCSP
Unoccupied Cool Setpoint
40-99
dF
UCSP
90
GAP
Heat-Cool Setpoint Gap
2-10
deltaF
HCSP_GAP
5
V.C.ON
VAV Occ. Cool On Delta
0-25
deltaF
VAVOCON
3.5
V.C.OF
VAV Occ. Cool Off Delta
1-25
deltaF
VAVOCOFF
2
SASP
Supply Air Setpoint
45-75
dF
SASP
55
SA.HI
Supply Air Setpoint Hi
45-75
dF
SASP_HI
55
SA.LO
Supply Air Setpoint Lo
45-75
dF
SASP_LO
60
SA.HT
Heating Supply Air Setpt
90-145
dF
SASPHEAT
85
T.PRG
Tempering Purge SASP
–20-80
dF
TEMPPURG
50
T.CL
Tempering in Cool SASP
5-75
dF
TEMPCOOL
5
T.V.OC
Tempering Vent Occ SASP
–20-80
dF
TEMPVOCC
65
T.V.UN
Tempering Vent Unocc. SASP
–20-80
dF
TEMPVUNC
50
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
EDT.R
EVAP.DISCHRGE TEMP RESET
RS.CF
EDT Reset Configuration
0 - 3
EDRSTCFG
0
RTIO
Reset Ratio
0 - 10
RTIO
2
LIMT
Reset Limit
0 - 20
deltaF
LIMT
10
RES.S
EDT 4-20 ma Reset Input
Enable/Disable
EDTRSENS
Disable
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
COOL
COOLING CONFIGURATION
Z.GN
Capacity Threshold Adjst
–10 - 10
Z_GAIN
1
MC.LO
Compressor Lockout Temp
–20 - 55
dF
OATLCOMP
40
C.FOD
Fan-Off Delay, Mech Cool
0-600
sec
COOL_FOD
60
MLV
Min. Load Valve (HGBP)?
Yes/No
MLV_SEL
No
M.M.
Motor Master Control ?
Yes/No
MOTRMAST
No
HPSP
Head Pressure Setpoint
80 - 150
dF
HPSP
113
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 - 30
min
HSSTTIME
10
Summary of Contents for WEATHERMAKER 48AJ020
Page 95: ...95 Fig 13 Typical Main Control Box Wiring Schematic A48 7787 ...
Page 96: ...96 TO NEXT PAGE Fig 14 Auxiliary Control Box Wiring Schematic A48 7294 ...
Page 98: ...98 Fig 15 Typical 2 Stage Gas Heat Wiring Schematic Size 051 and 060 Units Shown A48 6866 ...
Page 102: ...102 TO NEXT PAGE Fig 18 Typical Power Schematic Size 051 and 060 Units Shown A48 7298 ...
Page 104: ...104 Fig 19 Controls Option Wiring Schematic A48 7810 ...
Page 105: ...105 Fig 20 Small Chassis Component Location Size 020 035 Units A48 7301 ...
Page 106: ...106 Fig 21 Large Chassis Component Locations Size 036 060 Units A48 7302 ...