Carrier Touch Pilot Control Series Control Manual

8.8 - Water exchanger pumpsThe unit can control one evaporator water pump and onecondenser water pump. The pump can be turned on only whenthis option is configured (PUMPCONF) and when the unit is inone of the “on” modes described in section 8.1 or in “delay” mode.The Touch Pilot control provides the signal to command the pump,but it does not include the protection of the pump itself (low waterpressure, overload, etc.).8.8.1 - Pump operationThe pump keeps running for about 20 seconds after the unit goesto the stopping mode. The pump is turned off if the unit is shutdown due to an alarm unless the fault is a freeze protection error.The pump can be started in particular operating conditions whenfreeze protection of the heat exchanger is active.Since the minimum value for the delay at start-up is 1 minute(configurable between 1 and 15 minutes), the pump will run for atleast one minute before the first compressor starts.If configured, the cooler pump can be stopped when the unit is inHeating and the condenser pump can be stopped when the unitis in Cooling mode.To set cooler pump behaviour in Heating mode OR condenserpump behaviour in Cooling mode1. Navigate to the Configuration menu.2. Select Pump Configuration (PUMPCONF).3. Set Cooler Pump Off In Heat [stopheat] or Cond Pump Off InCool [stopcool] to “yes”.Cooler Pump Off In Heat [stopheat]Cond Pump Off In Cool [stopcool]no/yes yesNOTE: The water pump can also be stopped when the unit isin Standby mode (see section 8.8.3).8.8.2 - Pump protection (pump anti-stick function)The control provides a means to automatically start the pump eachday at 14:00 for 2 seconds when the unit is off.Starting the pump periodically for a few seconds extends thelifetime of the pump bearings and the tightness of the pump seal.To set pump sticking protection1. Navigate to the Configuration menu.2. Select Pump Configuration (PUMPCONF).3. Set Pump Sticking Protection [pump_per] to “yes”.Pump Sticking Protection [pump_per]no/yes yes8.8.3 - Standby pump (fixed speed pumps only)The control provides the Eco pump functionality which allows forstopping the pump periodically when the unit is in satisfied mode(no cooling or heating is required).The Eco pump mode can be applied to the condenser pump whenthe unit is in Heating mode and the cooler pump when in Coolingmode.To verify pump behaviour in Standby mode1. Navigate to the Main menu.2. Select Miscellaneous Status (MSC_STAT).3. Verify Eco Pump Mode Active [m_ecopmp].Eco Pump Mode Active [m_ecopmp]no/yes yesIMPORTANT: The Eco pump functionality can be enabled onlyby service technicians.8.9 - Customer variable speed pumpAs standard the unit provides the functionality to control a variablespeed pump. It is possible to control the water flow to keep constanttemperature difference on the evaporator water exchanger.Pump speed control may also be optimised by the installer(service-access level required).The pump is turned on and off the same way that the fixed speedpump, excluding the situation when the water loop does not requireproduction (the pump will be set to its minimum speed).8.10 - Condenser water valve (option 152)Saturated condensing temperature control is assured if the three-way valve option is selected. The saturated condensingtemperature is controlled based on a fixed setpoint that can beconfigured by the user via the SETPOINT table. The three-wayvalve control can be configured by the service department via theSERVICE table.8.11 - Unit short cycling protectionThe Touch Pilot control constantly monitors the control point whichdetermines the operation of compressor(s). Compressors areturned on and off in order to maintain the required control pointand satisfy the current cooling/heating demand.The control provides a protection that prevents the prematurestarting of compressors. The service-configured temperaturethreshold (acting upon the control point) is used for compressor(s)control.This unit short cycling option can be enabled via the touch screenby setting the “short cycle management” parameter in the GeneralConfiguration menu (GEN_CONF) to “yes”.8.12 - Refrigerant leak detection (option 159)This option permits refrigerant leak detection. Two sensors (notsupplied) that detect the refrigerant concentration in the air mustbe installed on the unit.If one of the two sensors detects an abnormal refrigerant level formore than one hour, an alarm is triggered (10050), without shuttingthe unit down. The refrigerant level and the time before triggeringan alert are configurable. To modify them, contact ManufacturerService Agency.8.13 - Night modeNight mode allows users to configure the unit to operate withspecific parameters in a specific time period. During the nightperiod, the unit capacity is limited and the number of operatingfans is reduced.The night period is defined by a start time and an end time thatare the same for each day of the week. The Night mode settingsor the maximum capacity value can be configured in the GeneralConfiguration menu (GEN_CONF).During the night period the condensing point is increased to limitthe number of fans operating (units with dry cooler condensingcontrol option).To set night mode settings1. Navigate to the Configuration menu.2. Select General Configuration (GEN_CONF).3. Set night mode parameters.Night Mode Start Hour [nh_start], Night Mode End Hour [nh_end]00:00Night Capacity Limit [nh_limit]0 to 100% 100%8 - STANDARD CONTROL OPERATIONS AND OPTIONS28