Carrier AQUAZONE 50PTH Installation And Service Instructions Manual

42vide cooling to the space when required. Should the capacitybe insufficient for a period greater than 5 minutes, or should ahigh humidity condition occur, then the compressor will bestarted to satisfy the load. Should the SAT reach the minimumcooling SAT limit, the economizer valve will close duringcompressor operation.Heating — Additionally, the economizer control will open thewater valve should the entering water loop temperature be suit-able for heating (at least 5 F above space temperature) andheat is required. The valve will be controlled in a similar man-ner except to satisfy the heating requirement. Should the coilcapacity be insufficient to satisfy the space load for more than5 minutes, then the compressor will be started to satisfy theload. Should the SAT reach the maximum heating SAT limit,the economizer valve will close during compressor operation.DEMAND LIMIT — The WSHP Open controller has theability to accept three levels of demand limit from the network.In response to a demand limit, the unit will decrease its heatingset point and increase its cooling set point to widen the range inorder to immediately lower the electrical demand. The amountof temperature adjustment in response is user adjustable forboth heating and cooling and for each demand level. The re-sponse to a particular demand level may also be set to zero.CONDENSER WATER LINKAGE — The control pro-vides optimized water loop operation using an universal con-troller (UC) open loop controller. Loop pump operation is auto-matically controlled by WSHP equipment occupancy sched-ules, unoccupied demand and tenant override conditions.Positive pump status feedback prevents nuisance fault trips.The condenser water linkage operates when a request for con-denser water pump operation is sent from each WSHP to theloop controller. This request is generated whenever any WSHPis scheduled to be occupied, is starting during optimal start (forwarm-up or pull down prior to occupancy), there is an unoccu-pied heating or cooling demand, or a tenant pushbutton over-ride. At each WSHP, the water loop temperature and the looppump status is given. The WSHP will NOT start a compressoruntil the loop pumps are running or will shutdown the com-pressors should the pumps stop. This prevents the WSHP fromoperating without water flow and thus tripping out on refriger-ant pressure, causing a lockout condition. The WSHP Opencontroller control will prevent this from occurring. Also, theloop controller can be configured to start the pumps only after aconfigurable number of WSHPs are requesting operation (from1-"N"). This can be used to prevent starting the entire loop op-eration for only one WSHP. Meanwhile, the WSHPs will notoperate if the loop pump status is off and therefore the WSHPcompressor will not run.COMPLETE C AND DELUXE D BOARDSYSTEM TESTTest mode provides the ability to check the control opera-tion in a timely manner. The control enters a 20-minute testmode by momentarily shorting the test terminals. All time de-lays are sped up 15 times. The following operations are com-mon to both Complete C and Deluxe D controls.Test Mode — To enter Test mode, cycle the fan 3 timeswithin 60 seconds. The LED will flash a code representing thelast fault when entering the Test mode. The alarm relay willalso power on and off during Test mode. See Tables 27 and 28.To exit Test mode, short the terminals for 3 seconds or cyclethe fan 3 times within 60 seconds.NOTE: The flashing code and alarm relay cycling code willboth have the same numerical label. For example, flashingcode 1 will have an alarm relay cycling code 1. Code 1 indi-cates the control has not faulted since the last power off topower on sequence.Table 27 — Complete C Control Current LEDStatus and Alarm Relay OperationsLEGENDNOTES:1. Slow flash is 1 flash every 2 seconds.2. Fast flash is 2 flashes every 1 second.3. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed bya 10-second pause. This sequence will repeat continually until the fault iscleared.Table 28 — Complete C Control LED Code andFault DescriptionsLEGENDLED STATUS DESCRIPTION OF OPERATION ALARM RELAYOnNormal Mode OpenNormal Mode withPM WarningCycle(closed 5 sec.,open 25 sec.)Off Complete C Control isnon-functional OpenSlow Flash Fault Retry OpenFast Flash Lockout ClosedSlow Flash Over/Under Voltage ShutdownOpen,(Closed after15 minutes)Flashing Code 1 Test Mode — No fault in memory Cycling Code 1Flashing Code 2 Test Mode —HP Fault in memory Cycling Code 2Flashing Code 3 Test Mode —LP Fault in memory Cycling Code 3Flashing Code 4 Test Mode —FP1 Fault in memory Cycling Code 4Flashing Code 5 Test Mode —FP2 Fault in memory Cycling Code 5Flashing Code 6 Test Mode —CO Fault in memory Cycling Code 6Flashing Code 7 Test Mode — Over/Undershutdown in memory Cycling Code 7Flashing Code 8 Test Mode — PM in memory Cycling Code 8Flashing Code 9 Test Mode — FP1/FP2Swapped Fault in memory Cycling Code 9CO — Condensate OverflowFP — Freeze ProtectionHP — High PressureLED — Light-Emitting DiodeLP — Low PressurePM — Performance MonitorLEDCODE FAULT DESCRIPTION1 No fault in memory There has been no fault sincethe last power-down to power-up sequence2 High-Pressure Switch HP switch opens instantly3 Low-Pressure Switch LP switch opens for30 continuous seconds beforeor during a call (bypassed forfirst 60 seconds)4 Freeze Protection Coax— FP1FP1 below Temp limit for30 continuous seconds(bypassed for first 60 seconds ofoperation)5 Freeze Protection Air Coil —FP2FP2 below Temp limit for30 continuous seconds(bypassed for first 60 seconds ofoperation)6 Condensate overflow Sense overflow (grounded) for30 continuous seconds7(Autoreset)Over/Under VoltageShutdown"R" power supply is <19VAC or>30VAC8 PM Warning Performance Monitor Warninghas occurred.9 FP1 and FP2Thermistors are swappedFP1 temperature is higher thanFP2 in heating/test mode, orFP2 temperature is higher thanFP1 in cooling/test mode.FP — Freeze ProtectionHP — High PressureLED — Light-Emitting DiodeLP — Low PressurePM — Performance Monitor