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

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If not in effect and unit is in a pre-occupied purge mode (Operating ModesMODEIAQ.P=ON), then the trip point is T.PRG. If not in effect and unit is in an occupied mode (Operating ModesMODEIAQ.P=ON), then the trip point is TEMPVOCC. For all other cases, the trip point is TEMPVUNC. NOTE: The unoccupied economizer free cooling does not qualify as a HVAC cool mode as it is an energy saving feature and has its own OAT lockout already. The unoccupied free cooling mode (HVAC mode = Unocc. Free Cool) will override any unoccupied vent mode from triggering a tempering mode. A minimum amount of time must pass before calling out any tempering mode. In effect, the EDT must fall below the trip point value –1° F continuously for a minimum of 2 minutes. Also, at the end of a mechanical cooling cycle, a 10 minutes delay will be enforced before considering a tempering during vent mode in order to allow any residual cooling to dissipate from the evaporator coil. If the above conditions are met, the algorithm is free to select the tempering mode (MODETEMP). If a tempering mode becomes active, the modulating heat source (staged gas or hot water) will attempt to maintain leaving-air temperature (LAT) at the tempering set point used to trigger the tempering mode. The technique for modulation of set point for staged gas and hydronic heat is the same as in a heat mode. More information regarding the operation of heating can be referenced in the Heating Control section. Recovery from a tempering mode (MODETEMP) will occur when the EDT rises above the trip point. On any change in HVACMODE, the tempering routine will re-assess the tempering set point which may cause the control to continue or exit tempering mode. Static Pressure Control — Variable air volume (VAV) air-conditioning systems must provide varying amounts of air to the conditioned space. As air terminals downstream of the unit modulate their flows, the unit must simply maintain control over duct static pressure in order to accommodate the needs of the terminals, and therefore to meet the varying combined airflow requirement. The unit design includes two alternative optional means of accommodating this requirement. This section describes the technique by which this control takes place. A unit intended for use in a VAV system can be equipped with an optional variable frequency drive (VFD) for the supply fan. The speed of the fan can be controlled directly by the ComfortLink controls. A transducer is used to measure duct static pressure. The signal from the transducer is received by the RXB board and is then used in a PID control routine to determine the required fan speed. The required speed is then communicated to the VFD. Generally only VAV systems utilize static pressure control. It is required because as the system VAV terminals modulate closed when less air is required, there must be a means of controlling airflow from the unit, thereby effectively preventing overpressurization and its accompanying problems. The three most fundamental configurations for most applications are ConfigurationSPSP.CF, which is the static pressure control type, ConfigurationSPSP.S, used to enable the static pressure sensor, and ConfigurationSP SP.SP, the static pressure set point to be maintained. OPERATION — On units equipped with a VFD and a proper static pressure sensor, when SP.CF, SP.S and SP.SP are configured, a PID routine periodically measures the duct static pressure and calculates the error from set point. This error at any point in time is simply the duct static pressure set point minus the measured duct static. The error becomes the basis for the Proportional term of the PID. The routine also calculates the 64 integral of the error over time, and the derivative (rate of change) of the error. A value is calculated as a result of this PID routine, and this value is then used to create an output signal used to adjust the VFD to maintain the static pressure set point. Static pressure reset is the ability to force a lowering of the static pressure set point through an external control signal. Explained in detail further below, the control supports this in two separate ways; through a 4 to 20 mA signal input wired to TB202 terminals 6 and 7 (thereby facilitating third party control), or via CCN controls. In the latter case, this feature leverages the communications capabilities of VAV systems employing ComfortID terminals under linkage. The system dynamically determines and maintains an optimal duct static pressure set point based on the actual load conditions in the space. This can result in a significant reduction in required fan energy by lowering the set point to only the level required to maintain adequate airflow throughout the system. SETTING UP THE SYSTEM — The options for static pressure control are found under the Local Display Mode ConfigurationSP. See Table 50. Static Pressure Configuration (SP.CF) — This variable is used to configure the use of ComfortLink controls for static pressure control. When set to disable, there is no static pressure control by ComfortLink controls. This would be used for a constant volume (CV) application when static pressure control is not required or for a VAV application if there will be third-party control of the VFD. In this latter case, a suitable means of control must be field installed. When set to enable, this will enable the use of ComfortLink controls for static pressure control via a supply fan VFD. Static Pressure Sensor (SP.S) — This variable enables the use of a supply duct static pressure sensor. This must be enabled to use ComfortLink controls for static pressure control. If using a third-party control for the VFD or IGV, this should be disabled. Static Pressure Low Range (SP.LO) — This is the minimum static pressure that the sensor will measure. For most sensors this will be 0 in. wg. The ComfortLink controls will map this value to a 4 mA sensor input. Static Pressure High Range (SP.HI) — This is the maximum static pressure that the sensor will measure. Commonly this will be 5 in. wg. The ComfortLink controls will map this value to a 20 mA sensor input. Static Pressure Set Point (SP.SP) — This is the static pressure control point. It is the point against which the ComfortLink controls compares the actual measured supply duct pressure for determination of the error that is used for PID control. Generally one would set SP.SP to the minimum value necessary for proper operation of air terminals in the conditioned space at all load conditions. Too high of a value will cause unnecessary fan motor power consumption at part-load conditions and/or noise problems. Too low a value will result in insufficient airflow. Additional information will be found on page 65, under Static Pressure Reset. VFD Minimum Speed (SP.MN) — This is the minimum speed for the supply fan VFD. Typically the value is chosen to maintain a minimum level of ventilation. NOTE: Most VFDs have a built-in minimum speed adjustment which must be configured for 0% when using ComfortLink controls for static pressure control. VFD Maximum Speed (SP.MX) — This is the maximum speed for the supply fan VFD. This is usually set to 100%. VFD Fire Speed Override (SP.FS) — This is the speed that the supply fan VFD will use during the fire modes; pressurization, evacuation and purge. This is usually set to 100%.
Table 50 — Static Pressure Control Configuration ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT SP SUPPLY STATIC PRESS.CFG. SP.CF Static Pressure Config Enable/Disable STATICFG Disable SP.S Static Pressure Sensor Enable/Disable SPSENS Disable SP.LO Static Press. Low Range –10 - 0 in. W.C. SP_LOW 0 SP.HI Static Press. High Range 0 - 10 in. W.C. SP_HIGH 5 SP.SP Static Pressure Setpoint 0 - 5 in. W.C. SPSP 1.5 SP.MN VFD Minimum Speed 0 - 100 % STATPMIN 20 SP.MX VFD Maximum Speed 0 - 100 % STATPMAX 100 SP.FS VFD Fire Speed Over. 0 - 100 % STATPFSO 100 SP.RS Stat. Pres. Reset Config 0 - 4 SPRSTCFG 0 SP.RT SP Reset Ratio (/dF) 0 - 2.00 SPRRATIO 0.2 SP.LM SP Reset Limit in iwc () 0 - 2.00 SPRLIMIT 0.75 SP.EC SP Reset Econo.Position 0 - 100 % ECONOSPR 5 S.PID STAT.PRESS.PID CONFIGS SP.TM Static Press. PID Run Rate 5 - 120 sec SPIDRATE 15 SP.P Static Press. Prop. Gain 0 - 5 STATP_PG 0.5 SP.I Static Pressure Intg. Gain 0 - 2 STATP_IG 0.5 SP.D Static Pressure Derv. Gain 0 - 5 STATP_DG 0.3 Static Pressure Reset Configuration (SP.RS) — This option is used to configure the static pressure reset function. When SP.RS = 0, there is no static pressure reset via an analog input. When SP.RS = 1, there is static pressure reset based on the CEM 4-20MA input and ranged from 0 to 3 in. wg. When SP.RS = 2, there is static pressure reset based on RAT and defined by SP.RT and SP.LM. When SP.RS = 3, there is static pressure reset based on SPT and defined by SP.RT and SP.LM. When SP.RS = 4, there is VFD speed control where 0 mA = 0% speed and 20 mA = 100% (SP.MN and SP.MX will override). Static Pressure Reset Ratio (SP.RT) — This option defines the reset ratio in terms of static pressure versus temperature. The reset ratio determines how much the static pressure is reduced for every degree below set point for RAT or SPT. Static Pressure Reset Limit (SP.LM) — This option defines the maximum amount of static pressure reset that is allowed. This is sometimes called a “clamp.” NOTE: Resetting static pressure via RAT and SPT is primarily a constant volume application which utilizes a VFD. The reasoning is that there is significant energy savings in slowing down a supply fan as opposed to running full speed with supply air reset. Maintaining the supply air set point and slowing down the fan has the additional benefit of working around dehumidification concerns. Static Pressure Reset Economizer Position (SP.EC) — This option effectively resets ECONOMIN to fully occupied ventilation position, to account for the drop in static pressure during static pressure reset control. The static pressure reset for the calculation cannot be larger than the supply air static set point (SPSP). The calculation is as follows: (Static Pressure Reset/SPSP) x (ECONOSPR – ECONOMIN) As an example, the static pressure set point (SPSP) = 1.5 in. wg. The current static pressure reset is set to 0.5 in. wg. The settings for ECONOSPR = 50% and ECONOMIN = 20%. Therefore, the amount to add to the economizer’s ECONOMIN configuration is: (0.5/1.5) x (50-20) = 10%. In effect, for the positioning of the economizer, ECONOMIN would now be replaced by ECONOMIN + 10%. Static Pressure PID Config (S.PID) — Static pressure PID configuration can be accessed under this heading in the ConfigurationSP submenu. Under most operating conditions the control PID factors will not require any adjustment and the factory defaults should be used. If persistent static pressure 65 fluctuations are detected, small changes to these factors may improve performance. Decreasing the factors generally reduce the responsiveness of the control loop, while increasing the factors increase its responsiveness. Note the existing settings before making changes, and seek technical assistance from Carrier before making significant changes to these factors. Static Pressure PID Run Rate (S.PIDSP.TM) — This is the number of seconds between duct static pressure readings taken by the ComfortLink PID routine. Static Pressure Proportional Gain (S.PIDSP.P) — This is the proportional gain for the static pressure control PID control loop. Static Pressure Integral Gain (S.PIDSP.I) — This is the integral gain for the static pressure control PID control loop. Static Pressure Derivative Gain (S.PIDSP.D) — This is the derivative gain for the static pressure control PID control loop. STATIC PRESSURE RESET — The configuration for Static Pressure Reset is found under ConfigurationSP. ITEM EXPANSION RANGE CCN POINT DEFAULT SENSSP.RS Static Press. Reset Sensor. Enable/ Disable SPRSTSEN Disable Static Pressure Reset Sensor (SP.RS) — If the outdoor air quality sensor is not configured (ConfigurationIAQ AQ.CFOQ.A.C=0), then it is possible to use the outdoor air quality sensor location on the CEM board to perform static pressure reset via an external 4 to 20 mA input. Enabling this sensor will give the user the ability to reset from 0 to 3-in. wg of static pressure. The reset will apply to the supply static pressure set point (ConfigurationSPSP.SP), where 4 mA = 0-in. wg and 20 mA = 3-in. wg. As an example, the static pressure reset input is measuring 6 mA, and the input is resetting 2 mA of its 16 mA control range. The 4 to 20 mA range corresponds directly to the 0 to 3 in. wg of reset. Therefore 2 mA reset is 2/16 * 3-in. wg = 0.375-in. wg of reset. If the static pressure set point (SP.SP) = 1.5-in. wg, then the static pressure control point for the system will be reset 1.5 – 0.375 = 1.125-in. wg. For third party 4 to 20 mA SP reset, wire the input to TB202 terminals 6 and 7. For reset via a connected ComfortID system, the Linkage Coordinator terminal monitors the primary-air damper position of all the terminals in the system. It then calculates the amount of supply static pressure reduction necessary to cause the most open damper in the system to open more than the minimum
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Controls, Start-Up, Operation, Serv
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WARNING What to do if you smell gas
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and the ENTER keys until the desire
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START-UP IMPORTANT: Do not attempt
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Table 4 — Fan Performance — 48P
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Table 6 — Fan Performance — 48P
Page 13 and 14: Table 8 — 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 and 50: Table 36 — Cool/Heat Set Point Of
Page 51 and 52: Table 38 — Run Status Cool Displa
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: STAGE Table 49 — IGC LED Indicato
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
Page 101 and 102: Table 81 — Discharge Pressure Tra
Page 103 and 104: Table 82 — Auto View of Run Statu
Page 105 and 106: Table 84 — Cooling Information Di
Page 107 and 108: equalize compressor oil levels. If
Page 109 and 110: Table 91 — Alert and Alarm Codes
Page 111 and 112: T072 (Evaporator Discharge Reset Se
Page 113 and 114: 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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