Carrier 48JZ (N) 024-060, 50GL 024-060, 48GP (N) 024-060 Easy SELECT-48JZ, Select Options

b.COOLING MODE

(1.) If indoor temperature is above temperature set point and humidity is below humidity set point, thermostat closes circuits R to G, R to Y/Y2 and R to O—The unit delivers single speed cooling airflow.

c.COOLING MODE-DEHUMIDIFICATION

(1.) If indoor temperature is above temperature set point and humidity is above humidity set point, thermostat or Ther- midistat™ closes circuits R to G, R to Y/Y2, R to O and humidistat or Thermidistat™ opens R to DH—The unit delivers airflow which is approximately 80 percent of the nominal cooling airflow to increase the latent capacity of the system.

d.COOLING MODE-SUPER DEHUMIDIFY OPERATION (SEE QUICK REFERENCE GUIDE)

NOTE: The indoor control used, such as a Thermidistat™, must be capable of providing Super Dehumidify operation mode and control must be configured as outlined in its installation instruc- tions. Consult indoor control literature to determine if control is capable of providing Super Dehumidify inputs and for configura- tion instruction.

(1.) If the indoor temperature is below the temperature set point and the humidity is above the humidity set point, the Thermidistat™ closes circuit R to O, opens circuits R to DH and R to G, and closes circuit R to Y/Y2. If circuit R to G is closed (24-v.), the motor will deliver airflow at the full cooling or cooling plus dehumidify mode requested value. If circuit R to G is open (0–v.) for Super Dehu- midify mode, the motor delivers reduced airflow to maxi- mize the humidity removal of the system while minimizing over cooling.

e.GAS HEATING MODE

(1.) Thermostat closes circuit R to W/W1—The unit delivers the selected gas heat airflow. The IGC will control a 45 sec. blower “On” delay and a 45 sec. “Off” delay.

EASY SELECT™—48JZ

NOTE: Either the Carrier Thermidistat™ or Dual Fuel ther- mostat is required for operation of the dual-fuel (48JZ) units. Be sure to follow the installation instructions supplied with the Thermidistat™. Either indoor temperature control must use an outdoor air sensor to properly control heating operation.

EASY SELECT™ CONFIGURATION TAPS FOR 48JZ

Easy Select™ taps are used by the installer to configure a system. The ICM motor uses the selected taps to modify its operation to a pre-programmed table of airflows.

The unit must be configured to operate properly with system components with which it is installed. To successfully configure a basic system (see information printed on circuit board label located next to select pins), move the 6 select wires to the pins which match the components used (See Fig. 8).

a.GAS HEAT/CFM—SELECT GAS HEAT INPUT SIZE Factory selected gas heat size should correspond to unit label.

b.AC/HP SIZE—SELECT SYSTEM SIZE INSTALLED

Factory selected air conditioner size should correspond to capacity of unit installed. Installer should verify air conditioner size to ensure that airflow delivered falls within proper range for the size unit installed. This applies to all operational modes.

c.SYSTEM TYPE—SELECT SYSTEM TYPE INSTALLED

Factory selected on 48JZ for HP-EFF.

SELECT OPTIONS

1. HP-COMFORT provides approximately 315 CFM/ton for higher normal heating air temperature and provides approxi-

		9 PIN CONNECTOR
ICM PRINTED CIRCUIT BOARD
	SEC1		SEC2		J1
	EASY SELECTTM
	GAS HEAT/CFM
	090	060	040	N/A
A	1250	1100	800
	VIO
		AC/HP SIZE
B	036	030	024	018
	BLU
	SYSTEM TYPE					DH
C	AC	HP-COMFORT		HP-EFF
	ORN					R
	AC/HP CFM ADJUST					W1
D	NOM	LO		HI		W2
	BLK					Y1
	ON/OFF DELAY					Y/Y2
						G
				J2
	0	30	0			O
E				ENH
	90	90	0			C
	WHT
	CONTINUOUS FAN				AUX1	HUM1
	LO	MED	HI	YEL
F
	YEL
					AUX2	HUM2
					24VAC
		HEATER/MOTOR			GRY

12 PIN CONNECTOR

C01039

Fig. 8—Detail of SPP Printed-Circuit Board

mately 350 CFM/ton cooling airflow for good humidity re- moval

2. HP-EFF (factory selected) Provides equal airflow for heating and cooling modes to increase overall heat pump efficiency. Provides approximately 400 CFM/ton.

d.AC/HP CFM ADJUST—SELECT NOMINAL, LOW, OR HIGH AIRFLOW

The AC/HP CFM Adjust select is factory set to the High-HI (NOM for 036, 060) tap. The CFM Adjust selections NOM/LO will regulate airflow supplied for all operational modes, except non-heat pump heating modes. HI provides 15 percent airflow over nominal unit size selected and LO provides 10 percent airflow below nominal unit size selected. Adjust selection options are provided to adjust airflow supplied to meet indi- vidual installation needs for such things as noise, comfort, and humidity removal (See Fig. 8, D as indicated).

e.ON/OFF DELAY—SELECT DESIRED TIME DELAY PROFILE

Four motor operation delay profiles are provided to customize and enhance system operation (See Fig. 8, E as indicated). Selection options are:

(1.) The standard 90 sec off delay (Factory Setting) at 100 percent airflow in cooling or heat pump heating mode. In gas heating mode, IGC will control a 45 sec “On” delay and a 45 sec “Off” delay.

(2.) A 30 sec cooling delay with no airflow/ 90 sec off delay at 100 percent airflow profile is used when it is desirable to allow system coils time to cool-down/heat-up in conjunc- tion with the airflow in cooling or heat pump heating mode.

(3.) A no delay option used for servicing unit or when a thermostat is utilized to perform delay functions. In gas heating mode IGC will control 45 sec on delay with no airflow and 45 sec off delay.

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