Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AquaForce 30XV140: Controls, start-up, operation, service and troubleshooting instructions

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Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 18 page image

18Enable-Off-Remote Switch (SW1)The position of the Enable-Off-Remote switch is ignored exceptwhen the Remote control type is selected. Refer to the MachineControl Methods section on page 25 for more details. A selectionfor Machine Control Method must also be made along with thecorrect position of the Enable-Off-Remote Switch. This switch isinstalled in all units. It is a 3-position switch used to control thechiller. When switched to the Enable position, the chiller will ig-nore the field-supplied Remote Contacts, enabling the unit all ofthe time. When switched to the Off position, the chiller will shutdown if running. This allows for local (at the unit) override of theRemote Contact input. When switched to the Remote position, afield-installed dry contact can be used to start and stop the chiller.The contacts must be capable of handling a 24 VAC, 50 mA load.In the Enable and Remote Contact (dry contacts closed) positions,the chiller is allowed to operate and respond to the scheduling con-figuration and set point data.Emergency On/Off Switch (SW2)This switch is installed in all units. The Emergency On/Off switchshould only be used when it is required to shut the chiller off im-mediately. Power to all modules is interrupted when this switch isoff and all outputs from these modules will be turned off.Energy Management Module (EMM)The EMM is available as a factory-installed option or as afield-installed accessory. See Fig. 21. When the EMM moduleis field-installed, the Carrier Controller must be set up to com-municate with the EMM module (Main Menu Configura-tion Menu Factory Parameters Energy ManagementModule Yes). The Energy Management Module allows thefollowing functions:• Chilled Water Temperature Reset — Resets the chilled wa-ter set point by the following methods:a. 4 to 20 mA Input: A field-supplied signal generatorand 1/ 2-watt, 250-ohm resistor are required.b. Space Temperature: A field-supplied space tempera-ture sensor is required.• Demand Limit — Limits the capacity of the machine fromunit capacity by the following methods:a. 4 to 20 mA Input: A field-supplied signal generatorand 1/ 2-watt, 250-ohm resistor are required.b. 2 or 3-Step Switch Control: A field-supplied dry con-tact switch is required. (One-Step Demand Limit doesnot require the EMM.)• Occupancy Override — Extends the occupied period formachine operation. A field-supplied dry contact switch isrequired.• Remote Chiller Lockout — Disables the chiller whenclosed. A field-supplied dry contact switch is required.• Ice Done Control Switch — Signals the machine to exitthe Ice Build mode and enter an unoccupied time period. Afield-supplied dry contact switch is required.The following status functions are available with the EMM board:• Capacity Output Signal — A 0 to10 vdc analog output sig-nal indicating chiller capacity is available.• Shutdown Status Relay — A 24 vac output signal indicat-ing that the machine is shutting down.• Alert Relay — A 24 vac output signal indicating the unithas an active alert.• Compressor Run Status — A 24 vac output signal (one forcompressor A, one for compressor B), indicating the com-pressor is on.The EMM communicates the status of all inputs with the Carri-er Controller module, and the controls adjusts the control point,capacity limit, and other functions according to the inputs re-ceived. See Table 12 for EMM board inputs and outputs.Fig. 21 — Energy Management ModuleCAUTIONCare should be taken when interfacing with other manufactur-er’s control systems due to possible power supply differences,full wave bridge versus half wave rectification, which couldlead to equipment damage. The two different power suppliescannot be mixed. Carrier Controller controls use half waverectification. A signal isolation device should be utilized if afull wave bridge rectifier signal generating device is used.221221221221 100K100K100K100K100KCH17 CH17CH16CH CH18 CH19 CH20 CH22CH21 CH2324 VAC12 11CH11b CH12 CH13 CH14 CH15 CH1 CH2 CH3 CH4 CH 5 CH 6 CH 7SIO LEN+ G - + G -SIO LENJ8J7BJ7AJ6J5J4J3J2BJ2AJ1CH24 CH25CH8CH9CH10CH11aJ9AJ9BRED LED - STATUSGREEN LED - LEN(Local Equipment Network)