TM

Rooftop Water Source Heat Pump Units 50RTG

Installation, Start-Up, and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .1,2

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

STORAGE

PROTECTION

INSPECT UNIT

Step 3 — Location of Unit . . . . . . . . . . . . . . . . . . . . . . . . 3 Step 4 — Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . 6 Step 5 — Condensate Drain . . . . . . . . . . . . . . . . . . . . . . 6 Step 6 — Piping Connections . . . . . . . . . . . . . . . . . . . . 6

WATER LOOP APPLICATIONS

GROUND-WATER APPLICATIONS

GROUND-LOOP APPLICATIONS

Step 7 — Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . 7

SUPPLY VOLTAGE

208-VOLT OPERATION

BLOWER SELECTION

Step 8 — Low Voltage Wiring. . . . . . . . . . . . . . . . . . . . 14

THERMOSTAT CONNECTIONS

WATER FREEZE PROTECTION

AIR COIL FREEZE PROTECTION

ACCESSORY CONNECTIONS

WATER SOLENOID VALVES

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15 System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .15,16

C Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

C Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

D Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Accessory Relay Configurations . . . . . 16

Water Valve (Slow Opening) . . . . . . . . . . . . . . . . . . . 16

Outside Air Damper (OAD) . . . . . . . . . . . . . . . . . . . . 16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-18

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 17

Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 18

Ground Coupled, Closed Loop and Plateframe Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 18

Page

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Units with Aquazone™ Complete C Control . . . . . 19 Units with Aquazone Deluxe D Control . . . . . . . . . . 19

SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19,20 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Aquazone Deluxe D Control LED Indicators . . . . . 20

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-22 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Water Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 21 Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 21 Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 22 Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 22

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 22-25 Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2

IMPORTANT: Read the entire instruction manual before starting installation.

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.

Improper installation, adjustment, alteration, service, main- tenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individ- ual instructions packaged with the kits or accessories when installing.

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

Book

1

4

PC 111

Catalog No. 535-004

Printed in U.S.A.

Form 50R-2SI

Pg 1

8-02

Replaces: New

Tab

5a

5a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Carrier 50RTG specifications Contents, Safety Considerations

50RTG specifications

The Carrier 50RTG represents a significant advancement in the field of rooftop air conditioning systems, combining performance, efficiency, and reliability for commercial applications. Designed to meet the rigorous demands of today’s buildings, the 50RTG series is ideally suited for a variety of environments, including retail, office spaces, and industrial facilities.

One of the standout features of the Carrier 50RTG is its energy efficiency. Utilizing the latest in compressor technology, these units achieve high Seasonal Energy Efficiency Ratios (SEER) and Energy Efficiency Ratios (EER), which translates to lower energy costs for users. This efficiency is further enhanced by the incorporation of environmentally friendly refrigerants that comply with current regulations, reducing the overall carbon footprint of the unit.

Another notable characteristic of the 50RTG series is its modular design. The unit can be tailored to specific requirements, making it versatile for different installation scenarios. This modularity not only simplifies maintenance and repair operations but also allows for easy upgrades as technologies evolve or as space demands change.

The advanced control system in the 50RTG is another key technology that sets it apart from competing products. Intuitive user interfaces and smart controls enable precise temperature regulation and improved energy management. These controls often include features such as variable speed fans and integrated economizers, which optimize the system's performance in real-time based on current load requirements.

Durability is also a hallmark of the Carrier 50RTG. Constructed with robust materials and designed to withstand harsh weather conditions, these units provide dependable operation year-round. The corrosion-resistant finish and weather-tight construction ensure that the systems maintain their performance levels and aesthetic appeal over time.

Additionally, the 50RTG series is designed with a focus on low noise operation. With quieter components and advanced noise control technology, these units are ideal for noise-sensitive environments, ensuring that occupants can work, live, or shop in comfort without disruptive background noise.

In summary, the Carrier 50RTG series exemplifies the perfect combination of energy efficiency, advanced technology, customization potential, durability, and low noise operation, making it a top choice for commercial heating and cooling needs. Its innovative features and reliable performance solidify its status as a leader in rooftop HVAC solutions, catering to the evolving requirements of modern buildings.