Cap Threshold Subtracting (Z.MIN) — This parameter is used in the calculation of SMZ and is calculated as follows:
Z.MIN = Configuration→COOL→Z.GN * (–10 + (4*
Cap Threshold Adding (Z.PLU) — This parameter is used in the calculation of SMZ and is calculated as follows:
Z.PLU = Configuration→COOL→Z.GN * (10 + (4*
High Temp Cap Override (H.TMP) — If stages of mechani- cal cooling are on and the error is greater than twice Y.PLU, and the rate of change of error is greater than 0.5° F, then a stage of mechanical cooling will be added every 30 seconds. This override is intended to react to situations where the load rapidly increases.
Low Temp Cap Override (L.TMP) — If the error is less than twice Y.MIN, and the rate of change of error is less than –0.5° F, then a mechanical stage will be removed every 30 sec- onds. This override is intended to quickly react to situations where the load is rapidly reduced.
Pull Down Cap Override (PULL) — If the error from set point is above 4° F, and the rate of change is less than –1° F per minute, then pulldown is in effect, and “SUM” is set to 0. This keeps mechanical cooling stages from being added when the error is very large, but there is no load in the space. Pulldown for units is expected to rarely occur, but is included for the rare situation when it is needed. Most likely pulldown will occur when mechanical cooling first becomes available shortly after the control goes into an occupied mode (after a warm unoccu- pied mode).
Slow Change Cap Override (SLOW) — With a rooftop unit, the design rise at 100% total unit capacity is generally around 30° F. For a unit with 4 stages, each stage represents about 7.5° F of change to EDT. If stages could reliably be cycled at very fast rates, the set point could be maintained very precisely. Since it is not desirable to cycle compressors more than 6 cy- cles per hour, slow change override takes care of keeping the PID under control when “relatively” close to set point.
MODE TRIP HELPER — The Mode Trip Helper table pro- vides information on the unit modes and when the modes start and stop. See Table 108. This information can be used to help determine why the unit is in the current mode.
CCN/LINKAGE DISPLAY TABLE — The CCN/Linkage display table provides information on unit linkage. See Table 109.
COMPRESSOR RUN HOURS DISPLAY TABLE — The Compressor Run Hours Display Table displays the number of run time hours for each compressor. See Table 110.
COMPRESSOR STARTS DISPLAY TABLE — The Com- pressor Starts Display Table displays the number of starts for each compressor. See Table 111.
TIME GUARD DISPLAY TABLE — The Time Guard Dis- play Table delay time for each compressor and heat relay. See Table 112.
SOFTWARE VERSION NUMBERS DISPLAY TABLE — The Software Version Numbers Display Table displays the software version numbers of the unit boards and devices. See Table 113.
Table 105 — Auto View of Run Status Display Table
ITEM | EXPANSION | RANGE | UNITS | POINT | WRITE STATUS |
VIEW | AUTO VIEW OF RUN STATUS |
|
|
|
|
HVAC | ascii string spelling out the hvac modes |
|
| string |
|
|
|
| |||
OCC | Occupied ? | YES/NO |
| OCCUPIED | forcible |
MAT | Mixed Air Temperature |
| dF | MAT |
|
EDT | Evaporator Discharge Tmp |
| dF | EDT |
|
LAT | Leaving Air Temperature |
| dF | LAT |
|
EC.C.P | Economizer Control Point |
| dF | ECONCPNT |
|
ECN.P | Economizer Act.Curr.Pos. | % | ECONOPOS |
| |
CL.C.P | Cooling Control Point |
| dF | COOLCPNT |
|
C.CAP | Current Running Capacity |
|
| CAPTOTAL |
|
HT.C.P | Heating Control Point |
| dF | HEATCPNT |
|
HT.ST | Requested Heat Stage |
|
| HT_STAGE |
|
H.MAX | Maximum Heat Stages |
|
| HTMAXSTG |
|
Table 106 — Economizer Run Status Display Table
ITEM | EXPANSION |
| RANGE |
| UNITS |
| POINT | WRITE STATUS |
ECON | ECONOMIZER RUN STATUS |
|
|
|
|
|
|
|
ECN.P | Economizer Act.Curr.Pos. |
|
| % |
| ECONOPOS |
| |
|
|
|
| |||||
ECN.C | Economizer Act.Cmd.Pos. |
|
| % |
| ECONOCMD | forcible | |
ACTV | Economizer Active ? |
| YES/NO |
|
|
| ECACTIVE |
|
DISA | ECON DISABLING CONDITIONS |
|
|
|
|
|
|
|
UNAV | Econ Act. Unavailable? |
| YES/NO |
|
|
| ECONUNAV |
|
R.EC.D | Remote Econ. Disabled? |
| YES/NO |
|
|
| ECONDISA |
|
DBC | DBC - OAT Lockout? |
| YES/NO |
|
|
| DBC_STAT |
|
DEW | DEW - OA Dewpt.Lockout? |
| YES/NO |
|
|
| DEW_STAT |
|
DDBC | DDBD- OAT > RAT Lockout? |
| YES/NO |
|
|
| DDBCSTAT |
|
OAEC | OAEC- OA Enth Lockout? |
| YES/NO |
|
|
| OAECSTAT |
|
DEC | DEC - Diff.Enth.Lockout? |
| YES/NO |
|
|
| DEC_STAT |
|
EDT | EDT Sensor Bad? |
| YES/NO |
|
|
| EDT_STAT |
|
OAT | OAT Sensor Bad ? |
| YES/NO |
|
|
| OAT_STAT |
|
FORC | Economizer Forced ? |
| YES/NO |
|
|
| ECONFORC |
|
SFON | Supply Fan Not On 30s ? |
| YES/NO |
|
|
| SFONSTAT |
|
CLOF | Cool Mode Not In Effect? |
| YES/NO |
|
|
| COOL_OFF |
|
OAQL | OAQ Lockout in Effect ? |
| YES/NO |
|
|
| OAQLOCKD |
|
HELD | Econ Recovery Hold Off? |
| YES/NO |
|
|
| ECONHELD |
|
O.AIR | OUTSIDE AIR INFORMATION |
|
|
|
|
|
|
|
OAT | Outside Air Temperature |
|
|
| dF |
| OAT | forcible |
OA.RH | Outside Air Rel. Humidity |
|
|
| % |
| OARH | forcible |
OA.E | Outside Air Enthalpy |
|
|
|
|
| OAE |
|
OA.D.T | OutsideAir Dewpoint Temp |
|
|
| dF |
| OADEWTMP |
|
91