78
Accept Global Holidays? (HOL.T)
If a device is broadcasting the time on the bus, it is possible to
accept the time yet not accept the global holiday from the
broadcast message.
Override Time Limit (O.T.L)
This configuration allows the user to decide how long an over-
ride occurs when it is initiated. The override may be config-
ured from 1 to 4 hours. If the time is set to 0, the override func-
tion will become disabled.
Timed Override Hours (OV.EX)
This displays the current number of hours left in an override. It
is possible to cancel an override in progress by writing “0” to
this variable, thereby removing the override time left.
SPT Override Enabled? (SPT.O)
If a space sensor is present, then it is possible to override an
unoccupied period by pushing the override button on the T55
or T56 sensor. This option allows the user to disable this func-
tion by setting this configuration to NO.
T58 Override Enabled? (T58.O)
The T58 sensor is a CCN device that allows cooling/heating
setpoints to be adjusted, space temperature to be written to the
rooftop unit, and the ability to initiate a timed override. This
option allows the user to disable the override initiated from the
T58 sensor by setting this option to NO.
Global Schedule Override? (GL.OV)
If the control is set to receive global schedules then it is also
possible for the global schedule broadcaster to call out an over-
ride condition as well. This configuration allows the user to
disable the global schedule broadcaster from overriding the
control.
Alert Limit Configuration
The ALLM submenu is used to configure the alert limit set-
points. A list is shown in Table 71.
SPT Low Alert Limit/Occ (SP.L.O)
If the space temperature is below the configurable occupied SPT
Low Alert Limit (
SP.L.O
), then Alert 300 will be generated and
the unit will be stopped. The alert will automatically reset.
SPT High Alert Limit/Occ (SP.H.O)
If the space temperature is above the configurable occupied
SPT High Alert Limit (
SP.H.O
), then Alert 301 will be gener-
ated and the unit will be stopped. The alert will automatically
reset.
SPT Low Alert Limit/Unocc (SP.L.U)
If the space temperature is below the configurable unoccupied
SPT Low Alert Limit (
SP.L.U
), then Alert 300 will be generated
and the unit will be stopped. The alert will automatically reset.
SPT High Alert Limit/Unocc (SP.H.U)
If the space temperature is above the configurable unoccupied
SPT High Alert Limit (
SP.H.U
), then Alert 301 will be gener-
ated and the unit will be stopped. The alert will automatically
reset.
EDT Low Alert Limit/Occ (SA.L.O)
If the evaporator discharge temperature is below the configu-
rable occupied evaporator discharge temperature (EDT) Low
Alert Limit (
SA.L.O
), then Alert 302 will be generated and
cooling operation will be stopped but heating operation will
continue. The alert will automatically reset.
EDT High Alert Limit/Occ (SA.H.O)
If the evaporator discharge temperature is above the configu-
rable occupied EDT High Alert Limit (
SA.H.O
), then Alert
303 will be generated and heating operation will be stopped but
cooling operation will continue. The alert will automatically
reset.
EDT Low Alert Limit/Unocc (SA.L.U)
If the evaporator discharge temperature is below the configu-
rable unoccupied EDT Low Alert Limit (
SA.L.U
), then Alert
302 will be generated and cooling operation will be stopped
but heating operation will continue. The alert will automatical-
ly reset.
EDT High Alert Limit/Unocc (SA.H.U)
If the evaporator discharge temperature is above the configu-
rable unoccupied EDT High Alert Limit (
SA.H.U
), then Alert
303 will be generated and heating operation will be stopped but
cooling operation will continue. The alert will automatically
reset.
RAT Low Alert Limit/Occ (RA.L.O)
If the return-air temperature is below the configurable occu-
pied RAT Low Alert Limit (
RA.L.O
), then Alert 304 will be
generated and internal routines will be modified. Unit opera-
tion will continue but VAV heating operation will be disabled.
The alert will automatically reset.
RAT High Alert Limit/Occ (RA.H.O)
If the return-air temperature is above the configurable occupied
RAT High Alert Limit (
RA.H.O
), then Alert 305 will be gener-
ated and operation will continue. The alert will automatically
reset.
Table 71 — Alert Limit Configuration
ITEM
EXPANSION
RANGE
UNITS
POINT
DEFAULT
SP.L.O
SPT lo alert limit/occ
-10 to 245
dF
SPLO
60
SP.H.O
SPT hi alert limit/occ
-10 to 245
dF
SPHO
85
SP.L.U
SPT lo alert limit/unocc
-10 to 245
dF
SPLU
45
SP.H.U
SPT hi alert limit/unocc
-10 to 245
dF
SPHU
100
SA.L.O
EDT lo alert limit/occ
-40 to 245
dF
SALO
40
SA.H.O
EDT hi alert limit/occ
-40 to 245
dF
SAHO
100
SA.L.U
EDT lo alert limit/unocc
-40 to 245
dF
SALU
40
SA.H.U
EDT hi alert limit/unocc
-40 to 245
dF
SAHU
100
RA.L.O
RAT lo alert limit/occ
-40 to 245
dF
RALO
60
RA.H.O
RAT hi alert limit/occ
-40 to 245
dF
RAHO
90
RA.L.U
RAT lo alert limit/unocc
-40 to 245
dF
RALU
40
RA.H.U
RAT hi alert limit/unocc
-40 to 245
dF
RAHU
100
R.RH.L
RARH low alert limit
0 to 100
%
RRHL
0
R.RH.H
RARH high alert limit
0 to 100
%
RRHH
100
SP.L
SP low alert limit
0 to 5
" H2O
SPL
0
SP.H
SP high alert limit
0 to 5
" H2O
SPH
2
BP.L
BP lo alert limit
-0.25 to 0.25
" H2O
BPL
-0.25
BP.H
BP high alert limit
-0.25 to 0.25
" H2O
BPH
0.25
IAQ.H
IAQ high alert limit
0 to 5000
IAQH
1200
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 ...