Carrier 48/50AJ specifications Controls Quick Start

Table 40B — Air Quantity Limits (50AJ,AK,AW,AY,A2,A3,A4,A5)

UNIT	COOLING			ELECTRIC HEAT
	Min CFM	Max CFM*	Min CFM		Max CFM
50AJ,AW,A2,A3020	6,000	10,000
50AK,AY,A4,A5020	4,000	10,000
50AJ,AW,A2,A3025	7,500	12,500
50AK,AY,A4,A5025	5,000	12,500
50AJ,AW,A2,A4027	8,100	13,500
50AK,AY,A3,A5027	5,400	13,500	6,000		15,000
50AJ,AW,A2,A4030	9,000	15,000
50AK,AY,A3,A5030	6,000	15,000
50AJ,AW,A2,A4035	10,500	17,500
50AJ,AW036	10,500	17,500
50AK,AY,A3,A5035	7,000	17,500
50AK,AY036	7,000	17,500
50AJ,AW,A2,A4040	12,000	20,000
50AJ,AW041	12,000	20,000
50AK,AY,A3,A5040	8,000	20,000	10,500		20,000
50AK,AY041	8,000	20,000
50AJ,AW,A2,A4050	13,500	20,000
50AK,AY,A3,A5050	10,000	20,000
50AJ,AW051	18,000	27,000
50AJ,AW,A2,A4060	18,000	27,000	15,000		27,000
50AK,AY051	12,000	27,000
50AK,AY,A3,A5060	12,000	27,000

*Operation at these levels may be limited by entering evaporator air wet bulb temperatures.

CONTROLS QUICK START

The following section will provide a quick user guide to set- ting up and configuring the A Series units with ComfortLink™ controls. See Basic Control Usage section on page 3 for infor- mation on operating the control. For wiring information, refer to unit wiring diagrams in the Major System Components sec- tion on page 101.

IMPORTANT: The ComfortLink controls provide the user with numerous configuration options such as set points, demand levels, reset, and many others. If the building owner or design engineer has not provided specific recom- mendations for these configuration settings, it is suggested that the installer do not make changes to the default factory settings. The factory-configured default values are appro- priate for many applications.

IMPORTANT: The unit is shipped with the unit control disabled. Enable the control by setting Local Machine Dis- able (Service Test→STOP) to No.

Two-Stage Constant Volume Units with Mechanical Thermostat — To configure the unit, per- form the following:

1.The type of control is configured under Configuration →UNIT→C.TYP. Set C.TYP to 4 (TSTAT 2 STG).

2.Remove jumpers from R-W2 and W2-W1 on TB4 in the control box.

3.See Economizer Options section on page 28 for addition- al economizer option configurations.

4.See Exhaust Options section on page 29 for additional exhaust option configurations.

Two-Stage Constant Volume Units with Space Sensor — To configure the unit, perform the following:

1.The type of control is configured under Configuration →UNIT→C.TYP. Set C.TYP to 6 (SPT 2 STG).

2.Under Configuration→UNIT→SENS→SPT.S, enable the space sensor by setting SPT.S to ENBL (enable).

3.Install jumpers between R-W2 and W2-W1 on TB4 in the control box.

4.The space temperature set points are configured under the Setpoints menu. The heating and cooling set points may

be configured. See the Heating Control and Cooling Control sections on pages 50 and 37 for further descrip- tion on these configurations. The following set points may be configured:

OHSP Occupied Heat Setpoint

OCSP Occupied Cool Setpoint

UHSP Unoccupied Heat Setpoint

UCSP Unoccupied Cool Setpoint

GAP Heat-Cool Setpoint Gap

5.The degrees of demand from the space temperature set points are configured under the Configuration→D.LV.T submenu. See the Heating Control and Cooling Control sections for further description on these configurations. The following set points may be configured:

L.H.ON Demand Level Lo Heat On

H.H.ON Demand Level Hi Heat On

L.H.OF Demand Level Lo Heat Off

L.C.ON Demand Level Lo Cool On

H.C.ON Demand Level Hi Cool On

L.C.OF Demand Level Lo Cool Off

6.Under Configuration→UNIT→CV.FN, set CV.FN to 1 for continuous fan or 0 for automatic fan.

7.To program time schedules, set SCH.N=1 under Config- uration→CCN→SC.OV→SCH.N to configure the control to use local schedules.

8.Under the Timeclock→SCH.L submenu, enter the desired schedule. See Time Clock Configuration section on page 75 for further description of these configurations.

9.Under the Configuration→CCN→SC.OV submenu, the following schedules and overrides should be configured:

O.T.L. Override time limit

SPT.O SPT override enabled?

T58.O T58 override enabled?

10.See Economizer Options section on page 28 for addition- al economizer option configurations.

11.See Exhaust Options section on page 29 for additional exhaust option configurations.

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