42
Table 45 — Staging Sequence with Hot Gas Bypass — 48/50A3,A5,A7,A9030-060
*With minimum load valve ON.
COOLING MODE DIAGNOSTIC HELP
To quickly determine 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 algorithm is an adaptive PID which is used
by the control whenever more than 2 stages of cooling are pres-
ent (
C.TYP
= 1,2,3, and 5). This section will describe its opera-
tion and define its parameters. 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” algo-
rithm 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
.
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
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 ...