Carrier AQUAZONE 50VS Installation And Service Instructions Manual

Contents

18Table 9 — Limits of OperationLEGEND*Requires additional insulation when operating below the dew point.4. Unit fan: Manually rotate fan to verify free rotation andensure that blower wheel is secured to the motor shaft. Besure to remove any shipping supports if needed. DO NOToil motors upon start-up. Fan motors are pre-oiled at thefactory. Check unit fan speed selection and compare todesign requirements.5. Condensate line: Verify that condensate line is open andproperly pitched toward drain.6. Water flow balancing: Record inlet and outlet water tem-peratures for each heat pump upon start-up. This checkcan eliminate nuisance trip outs and high velocity waterflow that could erode heat exchangers.7. Unit controls: Verify that the microprocessor DIP (dualin-line package) switches are set for proper operation andsystem configuration.System Checkout1. System water temperature: Check water temperature forproper range and also verify heating and cooling setpoints for proper operation.2. System pH: Check and adjust water pH if necessary tomaintain a level between 6 and 8.5. Proper pH promoteslongevity of hoses and fittings.3. System flushing: Verify that all hoses are connected endto end when flushing to ensure that debris bypasses theunit heat exchanger, water valves and other components.Water used in the system must be potable quality initiallyand clean of dirt, piping slag, and strong chemical clean-ing agents. Verify that all air is purged from the system.Air in the system can cause poor operation or systemcorrosion.4. Cooling tower/boiler: Check equipment for proper setpoints and operation.5. Standby pumps: Verify that the standby pump is properlyinstalled and in operating condition.6. System controls: Verify that system controls function andoperate in the proper sequence.7. Low water temperature cutout: Verify that low watertemperature cutout controls are provided for the outdoorportion of the loop. Otherwise, operating problems mayoccur.8. System control center: Verify that the control center andalarm panel have appropriate set points and are operatingas designed.FIELD SELECTABLE INPUTSJumpers and DIP switches on the control board are used tocustomize unit operation and can be configured in the field. SeeTables 10 and 11 for heat pump and BacNet control board DIPswitch settings.Table 10 — Heat Pump Control Board (PCB)LEGENDTable 11 — BacNet™ Control Board (PCB)LEGENDDIP Switch Settings and OperationDIP SWITCH 1 (Test Mode = Off/Normal Mode = On)Test Mode — Test mode is used to speed up the operationsequence of the unit, therefore creating a more timely trouble-shooting technique. All time delays are shorted by 10 timeswith the exception of the high-pressure lockout which isinstantaneous regardless of which mode the switch is posi-tioned. DIP switch 1 must be placed into the Normal mode toresume proper operation of the unit.DIP SWITCH 2 (FP 1 at 15 F = Off/FP 1 at 32 F = On)Water Side Freeze Protection Setting — DIP switch 2 is usedto determine the loop freeze protection setting. Depending onthe brine concentration of the liquid source, the temperaturecan be set at 15 F or 32 F. The switch MUST be set to the “On”position if pure water is used as the source brine. This is nor-mally the case in open loop systems. Set the DIP switch to the“Off” position for closed loop systems that contain a brine con-centration that allows liquid temperatures to fall to, or below,15 F.DIP SWITCH 3 (Tstat at Comm = off/tstat at 24-vac = On)Thermostat Selection — DIP switch 3 is used to select thetype of thermostat that will be used to control the unit. A digi-tal communicating thermostat can be purchased with the unitthat will allow all fault signals to be displayed on thethermostat. This allows for efficient troubleshooting and doesnot require that the technician access the electrical control boxAir Limits Cooling (F) Heating (F)Ambient Air Maximum 50 50Ambient Air Minimum 100 85Rated Ambient Air 80.6 68Rated Entering Air (db/wb) 80.6/66.2 68Entering Air Maximum (db/wb) 100/83 80Entering Water Minimum* 30 20Entering Water (Normal) 50-110 30-70Entering Water Maximum 120 90db — Dry Bulbwb — Wet BulbIMPORTANT: Jumpers and DIP switches should onlybe clipped when power to control board has been turnedoff.DIP SWITCHNUMBERPROTOCOLNoNetwork BacNet LonWorks Modbus(PC)1 — Test/Normal ON ON ON ON2 — FP1 15 F/32 F ON ON ON ON3 — Tstat Comm/24-vacON orOFF OFF OFF OFF4 — RV CoolingOff/On ON ON ON ON5 — Com2/Com1 ON OFF OFF OFF6 — Com2 ModbusAddress OFF OFF OFF OFF7 — Com2 ModbusAddress OFF OFF OFF OFF8 — Com2 ModbusAddress OFF OFF OFF OFFDIP — Dual In-Line PackagePC — Personal ComputerPCB — Printed Circuit BoardDIP SWITCH NUMBER POSITION OFF/ON1 ON2 OFF3 OFF4 OFF5 OFF6 OFF7 OFF8 OFFDIP — Dual In-Line PackagePCB — Printed Circuit Board