Installation Operation Maintenance

OperationTable 22 - Percent of damperTable 23 - Compressor staggingMechanical Cooling without anEconomizerMechanical cooling is used tomaintain the zone temperature.The UCP is designed to limit thecompressor cycle rates to within 10cycles per hour based on theminimum compressor "on" and "off"times. It stages the mechanicalcooling to control the zonetemperature to within +/-1°C of thesensor setpoint at the sensedlocation.Table 22 lists the compressorstepping sequence.zone temp - econ setpoint °Czone -ODT 0- 0.3 0.3 - 0.6 0.6 - 1.1 1.1 - 1.7 1.7 - 2 >5.80 - 4 °C 0% 3% 9% 30% 90% 100%4 - 8 °C 0% 2% 6% 20% 60% 100%> 8 °C 0% 1% 3% 10% 30% 100%ONOFFStep 1 Step 2 Step 3 Step 1 Step 2 Step 3275 - 350 comp1* comp 1+2 comp 1+2 comp1400 -500 stage 1** stage 2*** stage1+2 stage 1+2 stage 2*** stage 1**Note: The "Stages" listed under each step are the operating stages* - Single circuit, dual manifolded compressors** - Number one refrigeration circuit, Stand-alone compressor, is "On".*** - First Stage is "Off", Number two refrigeration circuit, manifolded compressor pair operating simultaneously,is "On".Supply Air TemperingThis function allows the supply airtemperature to be maintainedwithin a low limit parameter duringminimum ventilation periods. Whenthe system is operating in "Heating"mode, the low limit parameter isequal to the heating setpoint minus6 °C.When an economizer is installed, airtempering is allowed (if selected)when the fan system switch is in the"ON" position with no call forheating. If the supply airtemperature falls 6 °C below theheating setpoint, the next availablestage of heat will be turned on. Itwill remain on until the supply airtemperature reaches 6° above theheating setpoint.Off ModeThis mode is set at the zone sensoror by ICS. During this status, noheating, ventilation, or mechanicalcooling is being performed.When switching the "system"selector to the "Off" mode from anyother mode, any diagnostic dataand diagnostic indication signal willbe retained as long as the systemremains in the "Off" status.Switching the "System" selectorfrom the "Off" mode back to anyother mode of operation will resetall diagnostics and diagnosticsignals.Zone Temperature . UnoccupiedCoolingWhile a building is in an unoccupiedperiod as designated by a remotepanel with night setback or ICS, thenecessary stages of cooling willcycle to maintain the zonetemperature to within theunoccupied setpoint deadband. If aneconomizer is enthalpy enabled, itwill modulate in an attempt tomaintain the zone temperature towithin the setpoint deadband.50RT-SVX16C-E4