Carrier 25VNA8 Instruction Manual

Installation Instructions25VNA8Infinityr 18VS Variable Speed Heat Pumpwith Puronr RefrigerantNOTE: Read the entire instruction manual before starting

10A14021Fig. 12 -- AOC Control BoardCrankcase Heater OperationThis unit has an internal crankcase heater that will be energizedduring the of f cycle a

11The control board accumulates compressor run time. As theaccumulated run time approaches the selected defrost interval time,the control board monito

12Table 3 – Required Charge Adjustment for Indoor Coil ModelF urnace or Fan Coil ModelNumber25VNA824A003 25VNA825A003 25VNA836A003 25VNA848A003CNPV*36

13Heating Check Chart Procedur e (See Fig.16 -- 18)(Communicating / Non--communicating Systems)In heating mode, the required charging method is by wei

14Step 13 — Pumpdown & EvacuationCAUTION!ENVIRONMENTAL HAZARDFailure to follow this caution may result in environmentaldamage.Federal regulations

15MAJOR COMPONENTSVariable speed Control BoardA13361Fig. 19 -- AOC (Application Operational Control) BoardThe AOC board is located in the lower right

16TROUBLESHOOTINGSystems Communication FailureIf communication is lost with the User Interface (UI), the controlwill flash the appropriate fault code

17Refer to Table 5 and Fig. 21 and 22 for resistance values versustemperature.Table 5 – 10K/50Kohm Resistance Values vs Temperature10Kohm_C(_F)TEMPERA

18Suction Thermistor (OST)Suction Thermistor is used for assisting in EXV control and mustbe secured on the suction tube and aligned longitudinally to

19Status CodesTable 7 shows the status codes flashed by the amber status light.Most system problems can be diagnosed by reading the status codeas flas

2Information in these installation instructions pertains only to25VNA8 series units.SAFETY CONSI DERATIONSImproper installation, adjustment, alteratio

20Table 7 – TroubleshootingOutdoor Fan Dropped Out66 6Stator Heater Fault67666Fan Inverter Over Current63 6Fan Inverter Lockout762 HoursCompressor/Inv

21FINAL CHECKSIMPORTANT: Before leaving job, be sure to do thefollowing:1. Ensure that all wiring is routed away from tubingand sheet metal edges to p

22Copyright 2014 Carrier Corp. S 7310 W. Morris St. S India napolis, IN 46231 Edition Date: 05/14Manufacturer reserves the right to change, at any tim

37. Avoid direct tubing contact with water pipes, duct work,floor joists, wall studs, floors, and walls.8. Do not suspend refrigerant tubing from jois

4Step 3 — Clearance RequirementsWhen installing, allow suf ficient space for airflow clearance,wiring, refrigerant piping, and service. Allow 24 in. (

5Outdoor Unit Connected to Factory--Approved IndoorUnitOutdoor unit contains correct system refrigerant charge foroperation with factory-- approved, A

6Step 7 — Make Electrical Connections!WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Do not supp

7OORVS Cooling O/B W2 W1 W1Heat Stage 3 W/W1 W2Heat/Cool Stage 1 Y1 / W2 Y1 Y1Heat/Cool Stage 2 Y/Y2 Y/Y2 Y2Fan G G24VAC Hot Heating Rh R24VAC Hot Coo

8Step 8 — Compressor Crankcase HeaterThis compressor has an internal crankcase heater. Furnish powerto the unit a minimum of 24 hr before starting the

9Follow these steps to properly start up the system:1. After system is evacuated, close the disconnects to energizethe ID and OD units to access the u