Specifications

37
Table 41 — Staging Sequence Without Hot Gas Bypass —
48/50AK,AY030-060 and Multi-Stage 48/50AJ,AW030-060
Table 42 — Staging Sequence With Hot Gas Bypass — 48/50AK,AY030-060
*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 43.
Table 43 — Run Status Mode Trip Helper
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.
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 the perti-
nent parameters. It is generally not necessary to modify parame-
ters in this section. The information is presented primarily for
reference and may be helpful for troubleshooting complex oper-
ational problems.
The only configuration parameter for the SumZ algorithm is
located at the local display under Configuration
→ COOL → Z.GN. See Table 35.
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 build to 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 44.
Current Running Capacity (
C.CAP) — This variable repre-
sents the amount of capacity currently running in percent.
Current Cool Stage (
CUR.S) — This variable represents the
cool stage currently running.
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 repre-
sents (if adding a stage of cooling) how much the temperature
should drop in degrees depending on the R.PCT calculation
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
01234 5 01234 5
COMP Compressor Status Compressor Status
A1 OFF ON ON OFF ON ON OFF OFF ON ON ON ON
A2 OFF OFF ON ON ON ON OFF ON ON OFF ON ON
B1 OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF ON
B2 OFF OFF OFF OFF OFF ON OFF ON OFF ON ON ON
Unit Capacity 48/50A Unit Capacity 48/50A
30 0% 23% 45% 50% 73% 100% 0% 23% 45% 50% 73% 100%
35 0% 22% 48% 52% 74% 100% 0% 26% 48% 48% 74% 100%
40 0% 21% 43% 50% 71% 100% 0% 21% 43% 50% 72% 100%
50 0% 23% 46% 46% 68% 100% 0% 23% 46% 54% 77% 100%
60 0% 24% 50% 50% 74% 100% 0% 26% 50% 50% 76% 100%
STAGE
SEQUENCE 1 SEQUENCE 2
012345 6 012345 6
COMP Compressor Status Compressor Status
A1 OFF ON* ON ON OFF ON ON OFF OFF OFF ON ON ON ON
A2 OFF OFF OFF ON ON ON ON OFF ON* ON ON OFF ON ON
B1 OFF OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF ON
B2 OFF OFF OFF OFF OFF OFF ON OFF OFF ON OFF ON ON ON
Unit Capacity 48/50A Unit Capacity 48/50A
30 0% 12% 23% 45% 50% 73% 100% 0% 12% 23% 45% 50% 73% 100%
35 0% 12% 22% 48% 52% 74% 100% 0% 16% 26% 48% 48% 74% 100%
40 0% 13% 21% 43% 50% 71% 100% 0% 13% 21% 43% 50% 72% 100%
50 0% 16% 23% 46% 46% 68% 100% 0% 16% 23% 46% 54% 77% 100%
60 0% 19% 24% 50% 50% 74% 100% 0% 21% 26% 50% 50% 76% 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