Controls, Start-Up, Operation, Service and ... - Climayoreo

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Table 37 — Run Status Mode Trip Helper 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 R.TMP,S.TMP 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 L.C.ON H.C.ON L.C. OF L.C. OF/2 Lo Cool End Cooling Setpoint (OCSP,UCSP) Hi Cool Start Lo Cool Start Hi Cool End Fig. 6 — Cool Mode Evaluation 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. For non-linkage applications and VAV control types (C.TYP = 1 or 2), “TEMP” is the controlling return air temperature (R.TMP). For space sensor control, “TEMP” is the controlling space temperature (S.TMP). For linkage applications, “TEMP” is zone temperature: AOZT during occupied periods and AZT during unoccupied periods. SUMZ COOLING ALGORITHM — The SumZ cooling algorithm is an adaptive PID (proportional, integral, derivative) which is used by the control whenever more than 2 stages of cooling are present (C.TYP = 1,2,3, and 4). This section will describe its operation and define the pertinent 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 ConfigurationCOOLZ.GN. See Table 35. Capacity Threshold Adjust (Z.GN) — This configuration 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 StatusCOOL. See Table 38. Current Running Capacity (C.CAP) — This variable represents the amount of capacity currently running in percent. Current Cool Stage (CUR.S) — This variable represents the cool stage currently running. Requested Cool Stage (REQ.S) — This variable represents the requested cool stage. Cooling relay timeguards in place may prevent the requested cool stage from matching the current cool stage. Maximum Cool Stages (MAX.S) — This variable is the maximum number of cooling stages the control is configured for and capable of controlling. 50 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 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”. The control will add a stage when SMZ reaches 100 and decrease a stage when SMZ equals -100. Next Stage EDT Decrease (ADD.R) — This variable represents (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) Next Stage EDT Increase (SUB.R) — This variable represents (if subtracting a stage of cooling) how much the temperature should rise in degrees depending on the R.PCT calculation and exactly how much capacity is to be subtracted. SUB.R = R.PCT * (C.CAP — capacity after subtracting a cooling stage) For Example: If R.PCT = 0.2 and the control would be subtracting 30% capacity by taking the next step down, 0.2 times –30 = –6 F (SUB.R) Rise Per Percent Capacity (R.PCT) — This is a real time calculation that represents the number of degrees of drop/rise across the evaporator coil versus percent of current running capacity. R.PCT = (MAT – EDT)/ C.CAP Cap Deadband Subtracting (Y.MIN) — This is a control variable used for Low Temp Override (L.TMP) and Slow Change Override (SLOW). Y.MIN = -SUB.R*0.4375 Cap Deadband Adding (Y.PLU) — This is a control variable used for High Temp Override (H.TMP) and Slow Change Override (SLOW). Y.PLU = -ADD.R*0.4375 Cap Threshold Subtracting (Z.MIN) — This parameter is used in the calculation of SMZ and is calculated as follows: Z.MIN = ConfigurationCOOLZ.GN * (–10 + (4* (–SUB.R))) * 0.6 Cap Threshold Adding (Z.PLU) — This parameter is used in the calculation of SMZ and is calculated as follows: Z.PLU = ConfigurationCOOLZ.GN * (10 + (4* (–ADD.R))) * 0.6 High Temp Cap Override (H.TMP) — If stages of mechanical cooling are on and the error is greater than twice Y.PLU, and the rate of change of error is greater than 0.5F per minute, 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 –0.5F per minute, then a mechanical stage will be removed every 30 seconds. This override is intended to quickly react to situations where the load is rapidly reduced.
Table 38 — Run Status Cool Display ITEM EXPANSION RANGE UNITS CCN POINT WRITE STATUS COOL COOLING INFORMATION C.CAP Current Running Capacity % CAPTOTAL CUR.S Current Cool Stage COOL_STG REQ.S Requested Cool Stage CL_STAGE MAX.S Maximum Cool Stages CLMAXSTG DEM.L Active Demand Limit % DEM_LIM forcible SUMZ COOL CAP. STAGE CONTROL SMZ Capacity Load Factor -100 – +100 SMZ ADD.R Next Stage EDT Decrease ^F ADDRISE SUB.R Next Stage EDT Increase ^F SUBRISE R.PCT Rise Per Percent Capacity RISE_PCT Y.MIN Cap Deadband Subtracting Y_MINUS Y.PLU Cap Deadband Adding Y_PLUS Z.MIN Cap Threshold Subtracting Z_MINUS Z.PLU Cap Threshold Adding Z_PLUS H.TMP High Temp Cap Override HI_TEMP L.TMP Low Temp Cap Override LOW_TEMP PULL Pull Down Cap Override PULLDOWN SLOW Slow Change Cap Override SLO_CHNG HMZR HUMIDIMIZER CAPC Humidimizer Capacity HMZRCAPC C.EXV Condenser EXV Position COND_EXV B.EXV Bypass EXV Position BYP_EXV RHV Humidimizer 3-Way Valve HUM3WVAL C.CPT Cooling Control Point COOLCPNT EDT Evaporator Discharge Tmp EDT H.CPT Heating Control Point HEATCPNT LAT Leaving Air Temperature LAT Pull Down Cap Override (PULL) — If the error from set point is above 4F, and the rate of change is less than –1F 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 unoccupied 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 7.5F 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 cycles per hour, slow change override takes care of keeping the PID under control when “relatively” close to set point. Humidi-MiZer® Capacity (CAPC) — This variable represents the total reheat capacity currently in use during a Humidi- MiZer mode. A value of 100% indicates that all of the discharge gas is being bypassed around the condenser and into the Humidi-MiZer dehumidification/reheat coil (maximum reheat). A value of 0% indicates that all of the flow is going through the condenser before entering the Humidi-MiZer dehumidification/reheat coil (dehum/subcooling mode). Condenser EXV Position (C.EXV) — This variable represents the position of the condenser EXV (percent open). Bypass EXV Position (B.EXV) — This variable represents the position of the bypass EXV (percent open). Humidi-MiZer 3-Way Valve (RHV) — This variable represents the position of the 3-way valve used to switch the unit into and out of a Humidi-MiZer mode. A value of 0 indicates that the unit is in a standard cooling mode. A value of 1 indicates that the unit has energized the 3-way valve and entered into a Humidi-MiZer mode. Cooling Control Point (C.CPT) — Displays the current cooling control point (a target value for air temperature leaving the evaporator coil location). During a Humidi-MiZer mode, this variable will take on the value of the dehumidify cool set point (D.C.SP COOL). Compressors will stage up or down to meet this temperature. 51 Evaporator Discharge Temperature (EDT) — Displays the temperature measured between the evaporator coils and the Humidi-MiZer dehumidification/reheat coil. Units configured with Humidi-MiZer have a thermistor grid installed between these two coils to provide the measurement. This temperature can also be read at TemperaturesAIR.TCCT. Heating Control Point (H.CPT) — Displays the current heating control point for Humidi-MiZer. During a Reheat mode, this temperature will be either an offset subtracted from return air temperature (D.V.RA) or the Vent Reheat Set Point (D.V.HT). During a Dehumidification Mode, this temperature will take on the value of the original cooling control point so that the supply air is reheated just enough to meet the sensible demand in the space. The Humidi-Mizer modulating valves will adjust to meet this temperature set point. Leaving Air Temperature (LAT) — Displays the leaving air temperature after the Humidi-MiZer reheat/dehumidification coil. SumZ Operation — The SumZ algorithm is an adaptive PID style of control. The PID is programmed within the control and the relative speed of staging can only be influenced by the user through the adjustment of the Z.GN configuration, described in the reference section. The capacity control algorithm uses a modified PID algorithm, with a self adjusting gain which compensates for varying conditions, including changing flow rates across the evaporator coil. Previous implementations of SumZ made static assumptions about the actual size of the next capacity jump up or down. This control uses a “rise per percent capacity” technique in the calculation of SumZ, instead of the previous “rise per stage” method. For each jump, up or down in capacity, the control will know beforehand the exact capacity change brought on. Better overall staging control can be realized with this technique. SUM Calculation — The PID calculation of the “SUM” is evaluated once every 80 seconds. SUM = Error + “SUM last time through” + (3 * Error Rate) Where: SUM = the PID calculation Error = EDT – Cooling Control Point Error Rate = Error – “Error last time through”
Page 1 and 2: Controls, Start-Up, Operation, Serv
Page 3 and 4: WARNING What to do if you smell gas
Page 5 and 6: and the ENTER keys until the desire
Page 7 and 8: START-UP IMPORTANT: Do not attempt
Page 9 and 10: Table 4 — Fan Performance — 48P
Page 15 and 16: AIRFLOW (cfm) Table 10 — Fan Perf
Page 23 and 24: AIRFLOW (Cfm) LEGEND Table 18 — F
Page 29 and 30: AIRFLOW (cfm) LEGEND Bhp — Brake
Page 31 and 32: HIGH-EFFICIENCY MOTORS Nominal Maxi
Page 33 and 34: 2. Under the Setpoints menu, set th
Page 35 and 36: would use Period 2 and set days Sat
Page 37 and 38: there is a loss of communication be
Page 39 and 40: and when ON, the control sets a cap
Page 41 and 42: System Mode Test — When the syste
Page 43 and 44: Table 31 — Unit Configuration ITE
Page 45 and 46: SETTING UP THE SYSTEM Machine Contr
Page 47 and 48: High SST Alert Delay Time (H.SST)
Page 49: Table 36 — Cool/Heat Set Point Of
Page 53 and 54: To use Demand Limiting, select the
Page 55 and 56: Size 050, 055, 060 Contactor OFM(s)
Page 57 and 58: Whenever the outdoor ambient temper
Page 59 and 60: Demand Level Low Heat Off Offset (L
Page 61 and 62: Limit Switch Low Temp (SW.L.T) —
Page 63 and 64: STAGE Table 49 — IGC LED Indicato
Page 65 and 66: Table 50 — Static Pressure Contro
Page 67 and 68: Table 53 — Dirty Filter Switch Po
Page 69 and 70: NOTE: If the user wishes to disable
Page 71 and 72: the economizer modulates when attem
Page 73 and 74: P = K * BP.P * (error) I = K * BP.I
Page 75 and 76: its smoke. Closing the economizer (
Page 77 and 78: Table 57 — Indoor Air Quality Con
Page 79 and 80: Table 58 — Humidity Configuration
Page 81 and 82: The default sensor is the return ai
Page 83 and 84: TEMPERATURE COMPENSATED START LOGIC
Page 85 and 86: Sensor Trim Configuration — The T
Page 87 and 88: SUPPLY FAN VFD CONFIGURATION — Th
Page 89 and 90: REMOTE SWITCH LOGIC CONFIGURATION (
Page 91 and 92: Alarms and Alarm History for for an
Page 93 and 94: Transducer Troubleshooting — The
Page 95 and 96: Table 75 — 10K Thermistor vs Resi
Page 97 and 98: TEMP RESISTANCE (F) (Ohms) -25 98,0
Page 99 and 100: PRESSURE (PSIG) Table 80 — Suctio
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Table 81 — Discharge Pressure Tra
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Table 82 — Auto View of Run Statu
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Table 84 — Cooling Information Di
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equalize compressor oil levels. If
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Table 91 — Alert and Alarm Codes
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T072 (Evaporator Discharge Reset Se
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This alarm will disable mechanical
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This is the reverse of the Pressuri
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117 a48-8408 Fig. 19 — Typical Po
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OD ENTHALPY SWITCH LOW REMOTE OCCUP
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Fig. 23 — Typical Electric Heat U
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123 Fig. 25 — Typical Gas Heat Se
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125 Fig. 27 — Component Arrangeme
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ACCSY — Accessory ACC’Y — Acc
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Table 93 — Rooftop Control Board
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Table 96 — Control Expansion Modu
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LEGEND IAQ — Indoor Air Quality V
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the motor position to be configured
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TIME EWT LWT SETP Run Status Servic
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Fig. 37 — Door Latch Fig. 38 —
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SUPPLY FAN AND POWER EXHAUST MOTOR
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Routine cleaning of coil surfaces i
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Saturated Discharge Temperature (de
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Gas System Adjustment (48P Only) GA
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APPENDIX A — LOCAL DISPLAY TABLES
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APPENDIX B — CCN TABLES (cont) ST
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APPENDIX B — CCN TABLES (cont) ST
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APPENDIX B — CCN TABLES (cont) SE
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APPENDIX B — CCN TABLES (cont) MA
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APPENDIX B — CCN TABLES (cont) MA
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TESTACTC TESTCOOL TESTFANS TESTHEAT
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APPENDIX C — UNIT STAGING TABLES
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* 41 for Supply Fan Motor VFD, 42 f
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Fig. B — VFD Keypad START UP WITH
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Upload All Parameters — To upload
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To replace the main fan for frame s
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ALARM CODE ALARM NAME IN PANEL 2001
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APPENDIX E — MODE SELECTION PROCE
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CONTROLS SET POINT AND CONFIGURATIO
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