Carrier 48TJD Specifications download pdf (Page 22)

Enthalpy Sensor Jumper Settings -- There me two jumpers.

One julnper determines the mode of the enthalpy sensor. The

other jumper is not used. To access the jumpers, relnove the

4 screws holding the cover on the enthalpy sensor and then re-

move the covel: The factory settings for the jumpers are M3

and OFF.

The mode jumper should be set to M3 for 4 to 20 mA

output. The factory test jumper should remain on OFF or the

enthalpy sensor will not calculate enth_dpy.

ENTHALPY SENSORS AND CONTROL -- The enthalpy

control (HH57AC077) is supplied as a field-installed accessory

to be used with the EconoMiSer2 &unper control option. The

outdoor air enthalpy sensor is part of the enthalpy control. The

separate field-installed accessory return air enthalpy sensor

(HH57AC078) is required for differential enthalpy control.

NOTE: The enthalpy control must be set to the "D" setting for

differenti_d enthalpy control to work properly.

The enthalpy control receives the indoor and return

enthalpy from the outdoor and return air enthalpy sensol_ and

provides a dry contact switch input to the PremierLink TM

controllel: Locate the controller in place of an existing econo-

mizer controller or near the actuatol: The mounting plate may

not be needed if existing bracket is used.

A closed contact indicates that outside air is preferred to the

return air An open contact indicates that the economizer

should remain at minilnuln position.

Outdoor Air Enthalpy Sensor/Enthalpy Controller

(HH57AC077) -- To wire the outdoor air enthalpy sensor,

perform the following (see Fig. 30 and 31 ):

NOTE: The outdoor air sensor can be removed froln the back

of the enth_dpy controller and mounted relnotely.

1. Use a 4-conductol, 18 or 20 AWG cable to connect the

enthalpy control to the PremierLink controller and power

tl_dnsformel:

2. Connect the following 4 wires fiom the wire h_uness

located in rooftop unit to the enthalpy controller:

a. Connect the BRN wire to the 24 vac terminal (TRI)

on enthalpy control and to pin 1 on 12-pin harness.

b. Connect the RED wire to the 24 vac GND terminal

(TR) on enthalpy sensor and to pin 4 on 12-pin

harness.

c. Connect the GRAY/ORN wire to J4-2 on Premier-

Link controller and to terminal (3) on enthalpy

sensor.

d. Connect the GRAY/RED wire to J4-1 on Premier-

Link controller and to terminal (2) on enthalpy sensol:

NOTE: If installing in a Carrier rooftop, use the two gray wires

provided fiom the control section to the economizer to connect

PrelnierLink controller to terminals 2 and 3 on enth_dpy sensol:

Return Air Enthalpy Sensor -- Mount the return-air enthalpy

sensor (HH57AC078) in the return-air duct. The return air

sensor is wired to the enthalpy controller (HH57AC077). The

outdoor enth_dpy changeover set point is set at the controller.

To wire the return air enthalpy sensol; perform the follow-

ing (see Fig. 30):

1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to

connect the return air enthalpy sensor to the enthalpy

controller.

2. At the enthalpy control remove the factory-installed

resistor fi_m the (SR) and (+) terminals.

3. Connect the field-supplied RED wire to (+) spade

connector on the return air enthalpy sensor and the (SR+)

terminal on the enthalpy controllel: Connect the BLK

wire to (S) spade connector on the return air enthalpy

sensor and the (SR) terminal on the enthalpy controller.

ENTHALPY CONTROLLER

RED

TR r_ TRI_"" BRN

A( CSOD+rn--

SRI-h+ID-

LED

/OUTDOOR[

AIR

ENTHALPY

BLK SENSOR)

RED

___]1 F[S (RETURN AIR I

[] + ENTHALPY

SENSOR

GRAY/ORN

LWIRE HARNESS

GRAY/RED JIN UNIT

NOTES:

1. Remove factory-installed jumper across SR and + before con-

necting wires from return air sensor,

2. Switches shown in high outdoor air enthalpy state. Terminals 2

and 3 close on low outdoor air enthalpy relative to indoor air

enthalpy.

3. Remove sensor mounted on back of control and locate in out-

side airstream.

Fig. 30 -- Outdoor and Return Air Sensor Wiring

Connections for Differential Enthalpy Control

HH57AC077

ENTHALPY

CONTROL AND

OUTDOOR AIR

ENTHALPY SENSOR

HH57AC078 ENTHALPY

SENSOR (USED WITH

ENTHALPY CONTROL

FOR DIFFERENTIAL

ENTHALPY OPERATION)

÷ ÷

MOUNTING PLATE

Fig. 31 -- Differential Enthalpy Control,

Sensor and Mounting Plate (33AMKITENT006)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 55 56

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Carrier 48TJD Specifications Page 22

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