Carrier 48FK Potentiometer Inputs and Ranges, Conguration Header DIP Switch Factory Settings

Table 9 Ð Potentiometer Inputs and Ranges

			CONTROL
POTENTIOMETER	DESCRIPTION	LOCATION	VALID	DEFAULT VALUE
			RANGE
P1	Supply Air	Display	45 to 70 F	45 F if -22 F < P1 < 45 F
	Set Point	Board		70 F if P1 > 70 F OR IF P1 < -22 F
P2*	Economizer	Economizer	0 to 100%	None (0 if P2 is bad)
	Position	Motor
P3	Reset Limit	Accessory	0 to 80 F	None (limited to 70 F maximum)
		Board
P4²	Demand Limit,	Main Control Box	0 to 100%	None
	Single-Step
DLCM-P1	Demand Limit,	DLCM Board	50 to 100%	None
DLCM-P2	2-Step	DLCM Board	0 to 49%	None
P5*	Minimum Economizer	Accessory Board	0 to 100%	None
	Position
P6	Warm-Up			40 F if 0° F < P6 < 40 F OR IF P6 < 95 F
		Accessory Board	40 to 80 F	OR IF P6 < 0
	Set Point
				80 F if 80 F < P6 < 95 F
P7**	Reset	Reset Board	40 to 100 F	None
	Temperature

*Optional factory-installed economizer is required. Potentiometer P2 is not a set point.

²Accessory two-step demand limit module is required (which has 2 potentiometers), o r a 5 to 20 k-ohm ®eld-supplied potentiometer is required for single-step demand limit.

**Accessory temperature reset is required.

NOTE: Potentiometers P1-P6 input data to pin terminal connector J3.

Potentiometer P7 inputs data to pin terminal connector J1.

Con®guration Header Ð The con®guration header is a series of 8 small wires that are broken (open circuit) or unbroken (closed circuit) in a pattern to indicate several unique characteristics of the unit. The con®guration header is fac- tory set and should not be changed; changing the factory set- ting may cause the unit to malfunction.

Before start-up, visually check the con®guration header against the factory setting for the unit size. See Table 10 for factory settings. See Table 11 for purpose for each jumper.

Table 10 Ð Con®guration Header and

DIP Switch Factory Settings

	UNIT SIZES		UNIT SIZE		UNIT SIZE
	034-038,
JUMPER OR			044		104
	048-088
SWITCH NO.
	Header	Switch	Header	Switch	Header	Switch
	Position	Position	Position	Position	Position	Position
1		Off		Off		Off
2		Off		Off		Off
3		On/Off*		On/Off*		On/Off*
4		On/Off*		On/Off*		On/Off*
5		Off		Off		Off
6		Off		On		On
7		On		Off		Off
8		Off		Off		Off

LEGEND

DIP Ð Dual, In-Line Package

ÐBroken Jumper (open circuit)

ÐUnbroken Jumper (closed circuit)

*Depending on factory-installed options or ®eld-installed accessories.

Table 11 Ð Con®guration Header Jumpers

JUMPER	FUNCTION	FACTORY	MEANING
NUMBER		SETTING
1,2	Unit Type		VAV Rooftop Unit
3,4,5	Qty Compressors		2 Compressors
6	Expansion Valve		TXV
7	Power Frequency		60 Hz
8	Not Used		No Signi®cance

LEGEND

TXV Ð Thermostatic Expansion Valve

VAV Ð Variable-Air Volume

ÐBroken Jumper (open circuit)

ÐUnbroken Jumper (closed circuit)

DIP Switches Ð The DIP switches con®gure the unit for several factory-installed options and ®eld-installed ac- cessories, plus factory unloaders. The DIP switches are lo- cated under a plastic enclosure which must be removed for access. See Fig. 1. The switches can be ®eld adjusted. Switches must only be adjusted when control power is deenergized. See Table 12 for DIP switch purposes and Table 10 for fac- tory settings of the switch positions.

Disconnect control power before changing the settings of the DIP switches. To disconnect control power, open the control circuit breaker.

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