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

PC 111

Catalog No. 534-80034

Printed in U.S.A.

Form 48/50HG-5SI

Pg 1

6-01

Replaces: New

Book  1

1

4

4

Tab

1a 1b 6a 6b

Installation Instructions

Part Number CRECOMZR009A00 and CRECOMZR011A00

GENERAL

The accessory Economizer package uses microprocessor-

based controls to sequence mechanical cooling with cool out-
door air (free cooling) to satisfy the cooling load and minimize
energy consumption. Free cooling can be used alone or in
conjunction with mechanical cooling.

The standard economizer uses an outdoor-air temperature

sensor to sense outdoor-air temperature. When the outdoor-air
temperature is between two configurable ambient temperatures,
the economizer is allowed to cool. These temperature configura-
tions are the Economizer High Temperature Lockout (ECL.H)
and the Economizer Low Temperature Lockout (ECL.L). The
economizer will provide cooling when the outdoor temperature
is suitable as defined above by the lockout settings and if either
a thermostat or a space temperature probe has signaled a cooling
demand. In addition, if an outdoor enthalpy sensor accessory
has been installed, then the enthalpy reading must also be “low”
before economizer cooling can occur.

When free cooling is available, the Economizer sequences

free cooling with up to three stages of mechanical cooling to
maintain comfort in the space. When free cooling is not avail-
able, the Economizer modulates to an adjustable minimum
position to maintain a supply of fresh air entering the building.

Optional barometric relief dampers provide natural building

pressurization control. An optional power exhaust system is
available for jobs requiring greater relief.

PACKAGE USAGE AND CONTENTS

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 basic maintenance func-

tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations

INSTALLATION

1. Remove two manual dampers and one mist eliminating

filter from the outdoor air hood in the return end of unit.
(See Fig. 1.) Save the screws to use later.

2. Remove the side panel on the return end of the unit to ex-

pose the return section of the unit. Save the screws for use
later when replacing the panel. The inside of the unit will
contain a frame for installing the economizer as shown in
Fig. 2.

3. Remove the frame support brackets from both sides of

the frame inside the unit. Save the screws for use later.

4. Uncrate the economizer assembly. Position the damper

assembly so that it will rest on the angle bracket support
at the bottom of the economizer frame inside the unit.
Slide the economizer into the unit. (See Fig. 3.) Secure
the damper assembly to the frame using the 

1

/

4

-in. screws

provided.

5. Install one of the plastic bushings, supplied with the ac-

cessory, into the wire hole in the damper frame at the ac-
tuator side of the unit. (See Fig. 4.)

IMPORTANT: Read these instructions completely
before attempting to install the accessory Economizer.

48/50HG UNIT SIZE

PACKAGE NO.

QTY

CONTENTS

014-024

(CRECOMZR009A00)

50TG500288

1

Economizer Assembly

50TG400612

1

Wire Harness

50TG400620

1

Wire Harness

50TG500596

1

Control Board

50TG400517

1

Block-Off Panel

KH03DU350

3

Filters

1

Plastic Bushing

10

1

/

4

-14 

5

/

8

-in. Screw

4

#14-10 

7

/

8

-in. Washer Head 

Screw

5

#6-20 

3

/

4

-in. Pan Head Screw

4

8-in. Wire Tie

6

15-in. Wire Tie

028

(CRECOMZR011A00)

50TG5000720

1

Economizer Assembly

50TG4000612

1

Wire Harness

50TG4000620

1

Wire Harness

50TG5000596

1

Control Board

50TG4001186

1

Block-Off Panel

KH03DU350

3

Filters

1

Plastic Bushing

10

1

/

4

-14 

5

/

8

-in. Screw

4

#14-10 

7

/

8

-in. Washer Head 

Screw

5

#6-20 

3

/

4

-in. Pan Head Screw

4

8-in. Wire Tie

6

15-in. Wire Tie

IMPORTANT: Do not adjust the damper assembly.
the motor and damper have been pre-set and adjusted
for proper operation.

Turn off unit power and lock out. Electrical shock and per-
sonal injury could result.

Cover the duct opening as a precaution so objects cannot
fall into the return duct opening.

48/50HG014-028

Large Rooftop Units

Accessory Economizer Package

Содержание 48HG014-028

Страница 1: ...nnel When working on air conditioning equipment observe precau tions in the literature tags and labels attached to the unit and other safety precautions that may apply Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for unbrazing operations Have fire extinguishers available for all brazing operations INSTALLATION 1 Remove two manual dampers and one mist eliminating ...

Страница 2: ...stic bushing being careful not to damage the wires Route the harness across the back of the top member of the frame as shown and attach to the frame us ing the wire ties provided See Fig 4 RETURN END OF UNIT FRAME SUPPORT BRACKETS SIDE PANEL REMOVED WIRE ROUTING PLASTIC BUSHING EXISTING WIRE TIES PLASTIC BUSHING Fig 1 Return End of Unit Fig 2 Frame Support Brackets Side Panel Removed Fig 3 Slide E...

Страница 3: ... unit panels can now be replaced using the screws saved from the earlier steps Be sure to inspect all panel seals prior to re assembly and replace any seals that appear damaged 12 The control wiring can now be completed 13 Open the hinged control box compartment on the unit and remove the control box cover Save the screws for use lat er Be sure not to place sharp objects on any surface that could ...

Страница 4: ...J4 CEPL130346 01 STATUS LEN J1 J2 J4 J3 J5 J6 J7 J8 J9 J10 CCN YELLOW LED CCN CARRIER COMFORT NETWORK INSTANCE JUMPER RED LED STATUS MAIN BASE BOARD PART NUMBER GREEN LED LEN LOCAL EQUIPTMENT NETWORK Fig 8 Economizer Board Mounting Location Fig 9 Economizer Control Board Fig 10 Main Base Board ...

Страница 5: ...lug marked ECB J8 16 18 to the J8 connector on the Economizer Control Board plug J8 pins 16 through 18 Connect the plug marked ECB J7 to the J7 plug on the Economizer Control Board 20 Several wires will need to be connected to the BACK SIDE of the terminal strips TB4 and TB5 The wires are marked with the appropriate locations Connect the wires as marked to the back of the TB4 terminal strip locati...

Страница 6: ...then Use the arrow keys to scroll down to the Economizer High Temperature Lockout setting ECL H and press twice Use the arrow keys to increase or decrease the economizer lockout temperature and press and then Use the arrow keys to scroll down to the Economizer Low Temperature Lock out setting ECL L and press twice Use the ar row keys to increase or decrease the economizer lockout temperature and p...

Страница 7: ...connections Damper is jammed Identify the obstruction and safely remove Economizer operation is limited to minimum position Minimum position is set incorrectly Adjust minimum position setting Outdoor air temperature is above economizer high temperature lockout Adjust the high temperature lockout setting if it is incorrect otherwise economizer is operating correctly Outdoor air temperature is below...

Страница 8: ...any time specifications or designs without notice and without incurring obligations PC 111 Catalog No 534 80034 Printed in U S A Form 48 50HG 5SI Pg 8 8 01A 6 01 Replaces New Copyright 2001 Carrier Corporation Book 1 1 4 4 Tab 1a 1b 6a 6b 3 2 3 3 3 4 3 5 3 6 3 7 ...

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