Carrier 48/50AJ specifications There will be no MAT calculation, Unit Configuration

Compensated Start section for more information. A setting of 0 minutes indicates Temperature Compensated Start in Cooling is not permitted.

Temperature Compensated Start Heating Factor (TCS.H) — This factor is used in the equation of the Temperature Compen- sated Start Time Bias for heating. Refer to the Temperature Compensated Start section for more information. A setting of 0 minutes indicates Temperature Compensated Start in Heating is not permitted.

Fan Fail Shuts Downs Unit (SFS.S) — This configuration will determine whether the unit should shut down on a supply fan status fail or simply alert the condition and continue to run. If set to YES, then the control will shut down the unit and send out an alarm if supply fan status monitoring fails. If set to NO, the control will not shut down the unit if supply fan status mon- itoring fails but the control will send out an alert.

Fan Status Monitoring (SFS.M) — This configuration selects the type of fan status monitoring to be performed.

0 - NONE — No switch or monitoring

1 - SWITCH — Use of the fan status switch

2 - SP RISE — Monitoring of the supply duct pressure.

VAV Unoccupied Fan Retry Time (VAV.S) — Machine con- trol types 1 and 2 (VAV-RAT,VAV-SPT) monitor the return-air temperature during unoccupied periods to determine if there is a valid demand for heating or cooling before initiating an unoc- cupied heating or cooling mode. If the routine runs but con- cludes a valid demand condition does not exist, then the pro- cess is not permitted for the period of time defined by this con- figuration. Reducing this value allows a more frequent re- sampling process. Setting this value to zero will prevent any sampling sequence.

Unit Size (SIZE) — There are several unit sizes (tons) for the A Series control. Make sure this configuration matches the size called out by the model number of the unit. This is important as the cooling stage tables are directly determined based on this configuration.

Discharge Pressure Transducers (DP.XR) — This configuration configures the unit for use with discharge pressure transducers. The 48/50A2,A3,A4,A5 units will be automatically configured for discharge pressure transducers and DP.XR should be set to Yes.

Suction Pressure Transducer Type (SP.XR) — This configu- ration specifies the type of suction pressure transducer that is being used. Set SP.XR to 0 for support of a pressure transducer with a range of 0 to 135 psig. Set SP.XR to 1 for support of a pressure transducer with a range of 0 to 200 psig.

NOTE: The 48/50A2,A3,A4,A5 units do not require a change to the SP.XR factory default setting.

Refrigerant Type (RFG.T) — This configuration specifies the type of refrigerant used in the unit. Configuration RFG.T is set to 0 if the refrigerant used is R-22. Configuration RFG.T is set to 1 if the refrigerant used is R-410A. Do not change this setting.

Condenser Type (CND.T) — This configuration specifies the type of condenser installed in the unit. Configuration CND.T is set to 0 if the condenser is a round tube, plate fin coil (RTPF). Configuration CND.T is set to 1 if the condenser is a micro- channel heat exchanger coil (MCHX).

MAT Calc Config (MAT.S) — This configuration gives the user three options in the processing of the mixed-air tempera- ture (MAT) calculation:

•MAT.S = 0

There will be no MAT calculation.

•MAT.S = 1

The control will attempt to learn MAT over time. Any time the system is in a vent mode and the economizer stays at a particular position for long enough, MAT is set to equal EDT. Using this, the control has an internal table whereby it can more closely determine the true MAT value.

•MAT.S = 2

The control will not attempt to learn MAT over time.

To calculate MAT linearly, the user should reset the MAT table entries by setting MAT.R to YES. Then set MAT.S = 2. The control will calculate MAT based on the position of the economizer, outside-air temperature, and return-air temperature.

To freeze the MAT table entries, let the unit run with MAT.S

=1. Once sufficient data has been collected, change MAT.S

=2. Do not reset the MAT table.

Table 43 — Unit Configuration

ITEM	EXPANSION		RANGE	UNITS	CCN POINT	DEFAULTS
UNIT	UNIT CONFIGURATION
C.TYP	Machine Control Type	1	- 6		CTRLTYPE	4
CV.FN	Fan Mode (0=Auto, 1=Cont)	0	- 1		FAN_MODE	1
RM.CF	Remote Switch Config	0	- 3		RMTINCFG	0
CEM	CEM Module Installed	Yes/No			CEM_BRD	No
TCS.C	Temp.Cmp.Strt.Cool Factr	0	- 60	min	TCSTCOOL	0
TCS.H	Temp.Cmp.Strt.Heat Factr	0	- 60	min	TCSTHEAT	0
SFS.S	Fan Fail Shuts Down Unit	Yes/No			SFS_SHUT	No
SFS.M	Fan Stat Monitoring Type	0	- 2		SFS_MON	0
VAV.S	VAV Unocc.Fan Retry Time	0	- 720	min	SAMPMINS	50
SIZE	Unit Size (20-60)	20 - 60			UNITSIZE	20
DP.XR	Discharge Press. Transducers	Yes/No			DP_TRANS	No
SP.XR	Suct. Pres. Trans. Type	0	- 1		SPXRTYPE	0
RFG.T	REFRIG: 0=R22, 1=R410A	0	- 1		REFRIG_T	Unit dependent
CND.T	CND HX TYP: 0=RTPF, 1=MCHX	0	- 1		COILTYPE	Unit dependent
MAT.S	MAT Calc Config	0	- 2		MAT_SEL	1
MAT.R	Reset MAT Table Entries?	Yes/No			MATRESET	No
MAT.D	MAT Outside Air Default	0-100		%	MATOADOS	20
ALTI	Altitude……..in feet:	0	- 60000		ALTITUDE	0
DLAY	Startup Delay Time	0	- 900	sec	DELAY	0
STAT	TSTAT-Both Heat and Cool	Yes/No			TSTATALL	No
AUX.R	Auxiliary Relay Config	0	- 3		AUXRELAY	0
SENS	INPUT SENSOR CONFIG
SPT.S	Space Temp Sensor	Enable/Disable			SPTSENS	Disable
SP.O.S	Space Temp Offset Sensor	Enable/Disable			SPTOSENS	Disable
SP.O.R	Space Temp Offset Range	1	- 10		SPTO_RNG	5
RRH.S	Return Air RH Sensor	Enable/Disable			RARHSENS	Disable
FLT.S	Filter Stat.Sw.Enabled ?	Enable/Disable			FLTS_ENA	Disable

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