40
Table 44 — Staging Sequence without Hot Gas Bypass —
48/50A3,A5030-060 and Multi-Stage 48/50A2,A4030-060
Table 45 — Staging Sequence with Hot Gas Bypass — 48/50A3,A5030-060
*With minimum load valve ON.
COOLING MODE DIAGNOSTIC HELP — To quickly de-
termine the current trip points for the cooling modes, the Run
Status sub-menu at the local display allows the user to view the
calculated start and stop points for both the cooling and heating
trip points. The following sub-menu can be found at the local
display under
Run Status
TRIP
.
See Table 46.
The controlling temperature is “
TEMP
” and is in the middle
of the table for easy reference. The HVAC mode can also be
viewed at the bottom of the table.
Table 46 — Run Status Mode Trip Helper
SUMZ COOLING ALGORITHM — The SumZ cooling algo-
rithm is an adaptive PID which is used by the control whenever
more than 2 stages of cooling are present (
C.TYP
= 1,2,3, and
5). This section will describe its operation and define its param-
eters. It is generally not necessary to modify parameters in this
section. The information is presented primarily for reference
and may be helpful for troubleshooting complex operational
problems.
The only configuration parameter for the SumZ algorithm is
located at the local display under
Configuration
COOL
Z.GN
.
See Table 36
.
Capacity Threshold Adjust (
Z.GN
) — This configuration is
used on units using the “SumZ” algorithm for cooling capacity
control (
Configuration
UNIT
C.TYP
= 1, 2, 3 and 5). It
affects the cycling rate of the cooling stages by raising or
lowering the threshold that capacity must overcome in order to
add or subtract a stage of cooling.
The cooling algorithm’s run-time variables are located at
the local display under
Run Status
COOL
.
See Table 47.
Current Running Capacity (
C.CAP
)
—
This variable rep-
resents the amount of capacity in percent that is currently
running.
Current Cool Stage (
CUR.S
)
—
This variable represents the
cool stage currently running.
Requested Cool Stage (
REQ.S
)
—
This variable represents
the cool stage currently requested by the control.
Maximum Cool Stages (
MAX.S
)
—
This variable is the max-
imum number of cooling stages the control is configured for
and capable of controlling.
Active Demand Limit (
DEM.L
)
—
If demand limit is active,
this variable will represent the amount of capacity that the
control is currently limited to.
Capacity Load Factor (
SMZ
)
—
This factor builds up or
down over time (–100 to +100) and is used as the means of
adding or subtracting a cooling stage during run time. It is a
normalized representation of the relationship between “Sum”
and “Z.”
Next Stage EDT Decrease (
ADD.R
)
—
This variable rep-
resents (if adding a stage of cooling) how much the tempera-
ture should drop in degrees depending on the
R.PCT
calcula-
tion and exactly how much additional capacity is to be added.
ADD.R
=
R.PCT
*
(
C.CAP
— capacity after adding a cooling
stage)
For example: If
R.PCT
= 0.2 and the control would be
adding 20% cooling capacity by taking the next step up,
0.2 times 20 = 4 F (
ADD.R
).
STAGE
SEQUENCE 1
SEQUENCE 2
0
1
2
3
4
0
1
2
3
4
COMP
Compressor Status
Compressor Status
A1
OFF
ON
ON
ON
ON
OFF
OFF
ON
OFF
ON
A2
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
B1
OFF
OFF
ON
ON
ON
OFF
OFF
ON
ON
ON
B2
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
UNIT
Unit Capacity 48/50A
Unit Capacity 48/50A
030
0%
25%
50%
75%
100%
0%
25%
50%
75%
100%
035
0%
20%
50%
80%
100%
0%
20%
50%
70%
100%
040
0%
25%
50%
75%
100%
0%
25%
50%
75%
100%
050
0%
25%
50%
75%
100%
0%
25%
50%
75%
100%
060
0%
25%
50%
75%
100%
0%
25%
50%
75%
100%
STAGE
SEQUENCE 1
SEQUENCE 2
0
1
2
3
4
5
0
1
2
3
4
5
COMP
Compressor Status
Compressor Status
A1
OFF
ON*
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
A2
OFF
OFF
OFF
OFF
ON
ON
OFF
ON*
ON
ON
ON
ON
B1
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
B2
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
ON
UNIT
Unit Capacity 48/50A
Unit Capacity 48/50A
030
0%
10%
25%
50%
75%
100%
0%
10%
25%
50%
75%
100%
035
0%
7%
20%
50%
80%
100%
0%
7%
20%
50%
70%
100%
040
0%
14%
25%
50%
75%
100%
0%
14%
25%
50%
75%
100%
050
0%
16%
25%
50%
75%
100%
0%
16%
25%
50%
75%
100%
060
0%
18%
25%
50%
75%
100%
0%
18%
25%
50%
75%
100%
ITEM
EXPANSION
UNITS
CCN
POINT
TRIP
MODE TRIP HELPER
UN.C.S
Unoccup. Cool Mode Start
dF
UCCLSTRT
UN.C.E
Unoccup. Cool Mode End
dF
UCCL_END
OC.C.S
Occupied Cool Mode Start
dF
OCCLSTRT
OC.C.E
Occupied Cool Mode End
dF
OCCL_END
TEMP
Ctl.Temp RAT,SPT or Zone
dF
CTRLTEMP
OC.H.E
Occupied Heat Mode End
dF
OCHT_END
OC.H.S
Occupied Heat Mode Start
dF
OCHTSTRT
UN.H.E
Unoccup. Heat Mode End
dF
UCHT_END
UN.H.S
Unoccup. Heat Mode Start
dF
UCHTSTRT
HVAC
The current HVAC MODE
String
Содержание Carrier Weathermaker 48A2
Страница 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Страница 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Страница 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Страница 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Страница 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Страница 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Страница 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Страница 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Страница 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Страница 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Страница 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Страница 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Страница 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
