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. See Table 47.
STAGE
SEQUENCE 1 SEQUENCE 2
01234 5 01234 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
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