Carrier 33ZCVAVTRM Specifications download pdf (Page 146)

Mount the enthalpy sensor in a location where the indoor air

can be sampled (such as the return air duct). The enthalpy

sensor is not a NEMA 4 enclosure and should be mounted in a

location that is not exposed to outdoor elements such as rain or

snow. Use two field-supplied no. 8 x

-in. TEK screws. Insert

the screws through the holes in the sides of the enthalpy sensor.

Wiring

— Carrier recommends the use of 18 to 22 AWG

twisted pair or shielded cable for all wiring. All connections

must be made with

-in. female spade connectors.

The PremierLink™ board provides 24-vac to power the en-

thalpy switch/receiver. Connect the GND and 24-vac terminals

on the enthalpy switch/receiver to the terminals on the trans-

former. On some applications, the power from the economizer

harness can be used to power the enthalpy switch/receiver. To

power the enthalpy switch/receiver from the economizer har-

ness, connect power of the enthalpy switch/receiver to the red

and brown wires (1 and 4) on the economizer harness.

Connect the LOW Enthalpy terminal on the enthalpy

switch/receiver to J4 — pin 2 of the PremierLink control on the

HVAC unit. The switch can be powered through the Premier-

Link control board if desired. Wire the 24 vac terminal on the

enthalpy switch/receiver to J4 — pin 1 on the PremierLink

control. Wire the GND terminal on the enthalpy switch/

receiver to J1 — pin 2 on the PremierLink control. The HI

Enthalpy terminal is not used. See Fig. 24.

Connect the 4-20 mA In terminal on the enthalpy switch/

receiver to the 4-20 mA Out terminal on the return air enthalpy

sensor. Connect the 24-36 VDC Out terminal on the enthalpy

switch/receiver to the 24-36 VDC In terminal on the return air

enthalpy sensor. See Fig. 25.

Enthalpy Switch/Receiver Jumper Settings

— There are two

jumpers. One jumper determines the mode of the enthalpy

switch/receiver. The other jumper is not used. To access the

jumpers, remove the 4 screws holding the cover on the en-

thalpy switch/receiver and then remove the cover. The factory

settings for the jumpers are M1 and OFF.

The mode jumper should be set to M2 for differential en-

thalpy control. The factory test jumper should remain on OFF

or the enthalpy switch/receiver will not calculate enthalpy.

Enthalpy Sensor Jumper Settings

— There are two jumpers.

One jumper determines the mode of the enthalpy sensor. The

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

4 screws holding the cover on the enthalpy sensor and then

remove the cover. 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 enthalpy.

Enthalpy Sensors and Control — The enthalpy

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

to be used with the economizer damper control option. The

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

separate field-installed accessory return air enthalpy sensor

(HH58AC078) is required for differential enthalpy control. See

Fig. 26.

NOTE: The enthalpy control must be set to the “D” setting

for differential enthalpy control to work properly.

The enthalpy control receives the indoor and return

enthalpy from the outdoor and return air enthalpy sensors

and provides a dry contact switch input to the PremierLink

controller. Locate the controller in place of an existing

economizer controller or near the actuator. The mounting plate

may not be needed if existing bracket is used. See Fig. 27.

A closed contact indicates that outside air is preferred to the

return air. An open contact indicates that the economizer

should remain at minimum position.

OUTDOOR AIR ENTHALPY SENSOR/ENTHALPY

CONTROLLER (HH57AC077) — To wire the outdoor air

enthalpy sensor, perform the following (see Fig. 28 and 29):

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

of the enthalpy controller and mounted remotely.

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

enthalpy control to the PremierLink controller and power

transformer.

2. Connnect the following 4 wires from the wire harness

located in rooftop unit to the enthalpy controller:

a. Connect the BRN wire to the 24 vac terminal

(TR1) 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 ORN/GRAY wire to J4-2 on Premier-

Link controller and to terminal (3) on enthalpy sensor.

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

Link controller and to terminal (2) on enthalpy sensor.

OUTSIDE

AIR

RETURN AIR

ENTHALPY SENSOR

ENTHALPY

SWITCH

DIFFERENTIAL

ENTHALPY

CONTROLLER

Fig. 27 — Location of Differential Enthalpy

Controller and Return Air Enthalpy Sensor

on 50TJ Rooftop Unit

BRACKET

C7400A1004

Fig. 26 — Enthalpy Control, Sensor,

and Mounting Plate

HH57AC077

ENTHALPY

CONTROL AND

OUTDOOR AIR

ENTHALPY

SENSOR

HH57AC078 RETURN AIR

ENTHALPY SENSOR

(USED WITH ENTHALPY

CONTROL FOR DIFFERENTIAL

ENTHALPY OPERATION)

MOUNTING PLATE

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 315 316

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Carrier 33ZCVAVTRM Specifications Page 146

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