Carrier 48JZ (N) 024-060 Humidifier Wiring for 50GL & 50JZ, 50GL & 50JZ Sequence of Operation

This configuration provides the following comfort enhance- ments:

(a.) A 30 sec blower on delay with 150 sec at 70 percent airflow to allow the indoor coil to warm up or cool down before the blower is asked to deliver 100 percent airflow reducing the cold blow sensation at start up in heating and allowing the indoor coil to more quickly

EASY SELECT

BOARD TERMINAL

BLOCK

J1 DH

reach wet coil operating conditions in cooling.

(b.) A no blower off delay eliminates cold blow which may be associated with running the blower after shut down of the compressor and avoids re-evaporation of con- densed moisture after cooling/dehumidifying opera-

REMOVE R JUMPER

HUMIDISTAT

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tion.

(c.) Lower airflow while the compressor is running to reduce draft effects and increase heating air tempera- ture and improved humidity control during cooling operation.

ACCESSORY INSTALLATION

a.ACCESSORY ELECTRIC HEATERS

Electric heaters may be installed with the 50GL & 50JZ units per instructions supplied with electric heater package. See unit rating plate for factory-approved electric heater kits.

b.AUXILIARY TERMINALS

The AUX and HUM terminals on the Easy Select™ Board are tied directly to the G terminal, and provide a 24-v. signal whenever the G terminal is energized (See Fig. 12). During Super dehumidify mode, the G signal is not present and the auxiliary terminals are not energized. If the installation includes the use of the operating mode, do not use these terminals to control accessories. See Electronic Air Cleaner and Humidifier sections for further information.

c.ELECTRONIC AIR CLEANER CONNECTIONS

The AUX1 and AUX2 terminals are not always energized during blower operations, as described above. When using an electronic air cleaner with the unit, use Airflow Sensor P/N KEAAC0101AAA. The airflow sensor turns on electronic air cleaner when the blower is operating.

d.HUMIDIFIER/HUMIDISTAT CONNECTIONS

Easy Select™ Board terminals HUM1 and HUM2 are provided for direct connection to the low-voltage control of a humidifier through a standard humidistat (See Fig. 12). These terminals are energized with 24-v. when G thermostat signal is present. (See Fig. 11, 12 & 13). Alternately, the 24-v. signal may be sourced from the W and C circuit board connections. When using a Thermidistat™ Control, Zone Comfort Plus or Comfort Zone II, the 24-v. signal may be sourced directly from the Thermi- distat™ HUM terminal.

		HUMIDISTAT
HUM 1
(C)	24-VAC			TO HUMIDIFIER
HUM 2
(G)			HUMIDIFIER WIRING
				A95317

Fig. 12—Humidifier Wiring for 50GL & 50JZ

e.DEHUMIDIFY CAPABILITY WITH STANDARD HUMIDISTAT CONNECTION

Latent capacities for these units are better than average systems. If increased latent capacity is an application requirement, the circuit board provides connection terminals for use of a

Fig. 13—Humidistat Wiring for De-Humidify Mode-

for 50GL & 50JZ

standard humidistat. The unit will detect the humidistat contacts opening on increasing humidity and reduce its airflow to approximately 80 percent of nominal cooling mode airflow. This reduction will increase the system latent capacity until the humidity falls to a level which causes the humidistat to close its contacts. When the contacts close, the airflow will return to 100 percent of selected cooling airflow. To activate this mode, remove jumper J1 and wire in a standard humidistat ( See Fig. 13).

f.DEHUMIDIFY AND SUPER DEHUMIDIFY CAPABILITIES

these models are capable of responding to a signal from indoor system control (thermostat, Thermidistat™, zoning control) to operate in comfort control modes such as Super Dehumidify Mode. Consult literature provided with indoor system control to determine if these operating modes are available, and to see control set up instructions. No special setup or wiring of unit is required.

50GL & 50JZ SEQUENCE OF OPERATION

a.CONTINUOUS FAN

(1.) Thermostat closes circuit R to G—The Blower runs at continuous fan airflow.

b.COOLING MODE-LOW HUMIDITY

(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 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 O, and R to Y/Y2 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 cycles 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

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