Carrier 50PG03-16 Specifications download pdf (Page 1)

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

PC 111 Catalog No. 534-80217 Printed in U.S.A. Form 48/50H,P-3SI Pg 1 3-05 Replaces: New

Book1144

Tab 1a1b6a6b

Installation Instructions

Part Numbers CRENTSNG002A00 (Enthalpy Switch)

CRENTDIF002A00 (Differential Enthalpy Control)

PACKAGE CONTENTS — CRENTSNG002A00

PACKAGE CONTENTS — CRENTDIF002A00

GENERAL

If single, outdoor-air enthalpy control is desired, a single

enthalpy control must be installed in these units.

The accessory enthalpy switch maximizes the use of free

outdoor air for efficient economizer operation with 48/50HG

and 48/50PG rooftop units. It works with the outdoor-air sensor

to determine when the economizer can be used for cooling.

Differential enthalpy control is used to increase the operat-

ing efficiency of the rooftop system. The system compares the

temperature and humidity of the return air to that of the outdoor

air to determine whether outdoor air or mechanical cooling is

more economical and efficient. The accessory enthalpy switch

(CRENTSNG002A00) is required with the accessory differen-

tial enthalpy control (CRENTDIF002A00) to provide the dif-

ferential enthalpy control function.

NOTE: Use of the differential enthalpy control accessory

requires that the accessory enthalpy switch

(CRENTSNG002A00) is installed to sense outdoor enthalpy

and to provide input to the control system.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should

install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance

functions of replacing filters. All other operations should be

performed by trained service personnel. When working on air-

conditioning equipment, observe precautions in the literature,

tags and labels attached to the unit, and other safety precautions

that may apply.

INSTALLATION

Enthalpy Switch Installation

48/50PG03-16 UNITS

NOTE: If installing the enthalpy switch on an accessory econ-

omizer, it is easier to install the enthalpy sensor prior to install-

ing the economizer. If installing on a factory-installed

economizer, it is easier to install the enthalpy sensor prior to

installing the economizer hoods.

1. Remove the screws securing the economizer hood panel

to the unit. Save the screws for use later.

NOTE: On size 03-14 units with factory-installed econo-

mizers, the panel will be hinged and should not be re-

moved from the unit. Open the hinged panel and secure.

2. Mount the enthalpy switch to the economizer frame as

shown in Fig. 1, using the two screws provided.

3. From the unit harness assembly, locate the three enthalpy

wires (red, brown, and pink). Connect the red wire to

terminal 24VAC on the enthalpy switch. Connect the

brown wire to terminal GND on the enthalpy switch.

Connect the pink wire to terminal LOW on the enthalpy

switch. See Fig. 2.

4. If the accessory differential enthalpy control is also being

installed, install the accessory instead of performing the

following steps. See Differential Enthalpy Control Instal-

lation section on page 3.

5. Replace (or close if hinged panel) the economizer panel

using the screws saved from Step 1.

6. Restore power to the unit and configure the unit for use

with the accessory. See Configuring the Control System

sectiononpage5.

ITEM QUANTITY

Enthalpy Switch (Part No. HH57ZC003) 1

No. 10AB,

-in. long Sheet Metal Screw 2

ITEM QUANTITY

Differential Enthalpy Control

(Part No. HH57ZC001)

Red Wire Assembly (35-in. long) 1

Black Wire Assembly (35-in. long) 1

Grommet (Part No. KA56GR140) 1

No. 8,18,

-in. long Sheet Metal Screw 2

Prior to installation of this accessory, make sure all power

is disconnected to the unit and locked out. Failure to

disconnect power supply prior to servicing may result in

serious injury.

When removing panels from the unit, be careful not to

damage the roof or other surfaces with the panels.

IMPORTANT: Be sure all seal strips and RTV sealant

are intact. A watertight seal to inside of unit must be

maintained.

48/50HG014-028, 48/50PG03-28

Single-Package Rooftop Units

Enthalpy Switch Accessory and

Differential Enthalpy Control Accessory

for use with

COMFORT

LINK™ Controls

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Installation Instructions

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

Page 2 - ENTHALPY

248/50HG AND 48/50PG20-28 UNITSNOTE: For horizontal applications it is easiest to install theenthalpy sensor prior to making duct connections.1. Remov

Page 3 - DIFFERENTIAL

3Differential Enthalpy Control Installation48/50PG03-16 UNITSNOTE: If installing the differential enthalpy control on anaccessory economizer, it is ea

Page 4 - ACCESSORY

45. Locate holes on the economizer frame. Mount the differ-ential enthalpy control as shown in Fig. 7 using the No. 8screws provided.6. Connect the wi

Page 5

5CONFIGURING THE CONTROL SYSTEMConfiguring theComfortLink™ Control (48/50HG Units) — The ComfortLink control must be config-ured to use the enthalpy c

Page 6

Page 7

Page 8 - Book1144

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

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