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Фрагмент инструкции
Do this until stable operation is achieved. 12. Once satisfied with loop operation, remove all forced values which may have been initiated during this procedure. 13. Repeat Steps 1-12 until all loops have been checked. NOTE: For better tuning, the building supervisor or service tool should be used to adjust the proportional and integral terms. Contact your Carrier representative for more details. IAQ Control Loop Adjustment — The IAQ (indoor air quality) control loop is different from the other control loops. It has one gain value that can be adjusted in the serv ice subfunction ( ) under IAQG (indoor-air quality gain). This gain is used to speed up or slow down the response of the economizer dampers to the difference between the IAQ set point and the IAQ sensor. If the economizer is moving too slowly, then the gain needs to be increased. If the economizer moves too rapidly and overshoots the set point, then the gain should be reduced. Lead/Lag Circuits — Lead/lag circuits and compressors are shown in Table 20. Table 29 — Index of Lead/Lag Circuits and Compressors UNIT 48/50MP 62L 70M 82N, 90P, 10R LEAD CIRCUIT Compressor, Lead Compressor, Lag A A1 * A A1 A2 A A1 A2 LAG CIRCUIT Compressor, Lead Compressor, Lag B B1 * B B1 * B B1 B2 *Circuit only has 1 compressor. Final Checks — Ensure all safety controls are operating, control panel covers are on, and the service panels are in place. Recheck all set points against project specifications. Complete Start-Up Checklist and record operating values. Leave completed checklist with unit for future reference. NOTE: If the REMOTE START function is used in this application, set the LOCAL/REMOTE switch to REMOTE (On) at the end of start-up. CONTROL SYSTEM General — The control system consists of the following components: • standard processor module (PSIO 8088 or PSIO1) • options processor module (PSIO 8052 or PSIO2) • two standard high-voltage relay modules (DSIO-HV or DSIO1 and DSIO2) • keypad and display module (HSIO or LID) • enthalpy sensor • thermistors • pressure transducers • accessory humidity sensors • space temperature sensors (standard T55 and accessory T56) • supply-air fan status switch • check filter switch Components PROCESSOR MODULE NO. 1 — The PSIO1 module monitors and processes the following inputs, outputs, and system information: Inputs: • transducers • thermistors • switches Outputs: • condenser-fan contactors • integrated economizer motor (4 to 20 mA) • optional supply duct static pressure control (VFD) (4 to 20 mA) • optional modulating power exhaust control (VFD) (4 to 20 mA) System Information: • generates alert and alarm information (via transducer, thermistor, and sensor inputs) • supports CCN level II communications • supports digital air volume (DAV) interface NOTE: The correct module address for the PSIO1 is 01 (S1 set at 0; S2 set at 1). PROCESSOR MODULE NO. 2 — The PSIO2 module supports the sensors used for: • humidity control • outdoor-air cfm • indoor-air quality (IAQ) • smoke control • superheat monitoring (only when accessory transducer thermistor kit is field-installed). In addition, the PSIO2 supplies the outputs for humidity and hydronic heating coil control and a discrete output with timed clock control (for outdoor building or parking lot lights). NOTE: The correct module address for the PSIO2 is 31 (S1 set at 3; S2 set at 1). HIGH-VOLTAGE RELAY MODULES (DSIO) — The DSIO modules close contacts to energize evaporator and condenser fan contactors. The modules also control compressor unloaders, compressor contactors, compressor crankcase heaters, heat interlock function, and power exhaust contactor. The compressor status through the compressor lockout (CLO) relays and high-pressure switches (safety circuits) are the inputs to these modules. NOTE: The correct module addresses for the DSIO1 and DSIO2 modules are 19 and 49, respectively. Set the switch closest to the mounting plate at 1 (DSIO1) or 4 (DSIO2), and the other switch at 9 (both modules). 42 KEYPAD AND DISPLAY MODULE (HSIO) IMPORTANT: The HSIO (human sensor input/output) keypad and display module is required for initial start-up of these units. All units are shipped in standby mode, and the HSIO must be used to change the unit to run mode. Once the unit is in run mode, the HSIO is not required for normal operation. The keypad and display module HSIO (or local interface device, LID, factory-installed and located in the main control box) provides unit function information at the unit. The module consists of a keypad with 6 function keys, 5 operative keys, 10 numeric keys (0 through 9), and an alphanumeric 8-character liquid crystal display (LCD). Key usage is explained in Table 23. Each function has one or more subfunctions as shown in Table 29. The HSIO keypad and display module is installed through connection of the power and communication plugs and can be easily moved from one unit to another. Because of this flexibility, one HSIO can be used for several units. Unit operat...
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