Carrier 50PG03-07 installation instructions Field Fabricate Ductwork, Make Unit Duct Connections

Page 7

Step 3 — Field Fabricate Ductwork

On vertical units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For horizontal applications, field-supplied flanges should be attached to horizontal discharge openings and all ductwork secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.

A minimum clearance is not required around ductwork. Cabinet return-air static pressure (a negative condition) shall not exceed 0.35-in. wg with economizer or 0.45-in. wg without economizer.

Step 4 — Make Unit Duct Connections

Vertical Supply/Return Configuration

Unit is shipped in vertical supply/return configuration. Ductwork openings are shown in Fig. 1 and 3. Attach the ductwork to the roof curb. Do not attach duct directly to the unit.

!WARNING

PERSONAL INJURY HAZARD

Failure to follow this warning could result in personal injury.

For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90-degree turn in the return ductwork between the unit and the conditioned space. If a 90-degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space.

Horizontal Supply/Return Applications

Unit can be field-converted from vertical supply/return to horizontal supply/return. Remove all screws securing horizontal

duct covers to duct panel. Save panels. Install duct covers in the vertical duct openings in the basepan with the insulation side up. Covers will drop into openings and can be secured using field-supplied self-tapping screws. Ductwork can be attached to duct flanges provided on unit. When securing ductwork to unit, do not drill in area below bead or above top edge of duct opening.

Step 5 — Install External Trap for Condensate Drain

The unit’s 3/4-in. condensate drain connections are located on the bottom and side of the unit. If the down drain is used, drill a minimum of a 5/8-in. diameter hole but not larger than a 3/4-in. diameter hole through the drain pan. A dimple of 2 mm in diameter and 1.5 mm deep will be provided in the drain pan to help locate the drill bit and to start the hole. Do not cut through the PVC pipe threads. Unit discharge connections do not determine the use of drain connections; either drain connection can be used with vertical or horizontal applications. See Fig. 2 for locations.

When using the standard side drain connection, make sure the plug (red) in the alternate bottom connection is tight before installing the unit. (See Fig. 5.)

To use the bottom drain connection for a roof curb installation, relocate the factory-installed plug (red) from the bottom connection to the side connection. A 1/2-in. socket extension can be used to remove the plug. (See Fig. 5.) The piping for the condensate drain and external trap can be completed after the unit is in place.

All units must have an external trap for condensate drainage. Install a trap at least 4-in. deep and protect against freezeup. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1-in. per 10 ft of run. Do not use a pipe size smaller than the unit connection (3/4-in.). (See Fig. 6 and 7.)

The 50PG units are provided with a removable condensate pan for ease of cleaning. It is recommended that a union be placed between the unit and condensate drainage to ease the removal of the pan during servicing. Adequate clearance should be allowed if removal of condensate pan is required. Allow 54-in. between condensate pan access panel and any obstruction for complete removal.

50PG03-- 07

CONTROL BOX

AND

COMPRESSOR

ELECTRICAL

OPTIONS PANEL

INDOOR MOTOR

ACCESS DOOR

OUTDOOR AIR SCREEN (HIDDEN)

CONDENSER COIL

ACCESS PANEL

ECONOMIZER

HOOD

BAROMETRIC

ELECTRIC HEAT

ACCESS DOOR

RELIEF DAMPER

FILTER ACCESS DOOR

HOOD

BASEPAN CONNECTIONS

 

 

ACCESS PANEL

C07272

Fig. 4 - Panel and Filter Locations

7

Page 6 Page 8
Image 7
Page 6 Page 8
Contents Installation Instructions 50PG03 Base Unit Dimensions Rig and Place Unit Provide Unit SupportCondenser Coil Base Unit 50PGCompressor Refrigerant TypeRETURN-AIR Filters Evaporator FANField Fabricate Ductwork Install External Trap for Condensate DrainMake Unit Duct Connections Make Electrical Connections Field Power SupplyField Power Wiring Connections Field Control Thermidistat Wiring Third Party Smoke Detector on Humidi-MiZert RLA LRA FLA Type IFM Electric Heat Power Supply Disconnect Unit Range SizeNominal Voltage Compressor OFM ExhaustType FLA Electric Heat Power SupplyVoltage Compressor RLA LRA50PG03 Range IFM IFM Electric Heat Power SupplyRLA LRA FLA Range IFM Size IFM Electric Heat Power Supply DisconnectRLA Electric Heat Power Supply DisconnectVoltage Compressor OFM Range Size36.3 37.1 13.9 15.0 22.1 High575-3-60 518 633 13.9 15.0 22.1 13.9 15.0 23.9RLA LRA FLA Type 18.5 20.0 29.5 17.3 15.0 27.617.3 15.0 28.4 18.5 20.0 27.864.3/72.0 38.5/38.539.3/43.1 51.8/57.5Install All Accessories Install Outdoor Air Hoods Units with Economizer

50PG03-07 specifications

The Carrier 50PG03-07 is a cutting-edge rooftop unit designed to provide exceptional heating and cooling capabilities for commercial spaces. Known for its durability and efficiency, this model is part of Carrier's renowned line of packaged rooftop units, combining advanced technologies with a user-friendly design.

One of the standout features of the 50PG03-07 is its energy efficiency. This unit is equipped with a high-efficiency compressor that maximizes performance while minimizing energy consumption. The unit often boasts a high SEER (Seasonal Energy Efficiency Ratio) rating, making it an environmentally friendly choice for businesses looking to reduce their operating costs and carbon footprint.

The 50PG03-07 incorporates advanced controls, including a microprocessor-based control system that allows for precise temperature management and monitoring. This system not only enhances user comfort but also provides diagnostic capabilities, ensuring the unit operates at peak performance and identifying any potential issues early on.

In terms of design, the Carrier 50PG03-07 features a compact and robust structure that is built to withstand various weather conditions, ensuring longevity and reliability. The unit’s easy access panels simplify maintenance, allowing technicians to perform routine checks and repairs without cumbersome disassembly.

The air distribution system of the 50PG03-07 is engineered for optimal airflow, enhancing comfort across different areas of a building. It features multiple options for air handling, including variable air volume controls, which allows for customized air delivery to suit specific space requirements.

Noise reduction technology is also a priority in this model. The unit is designed to operate quietly, minimizing disruptions in office environments, retail settings, or other commercial spaces. This ensures that occupants can focus on their tasks without being disturbed by mechanical sounds.

Furthermore, the Carrier 50PG03-07 is adaptable with various accessories that can enhance its functionality, such as economizers for improved ventilation and humidity control. By integrating these components, businesses can create an efficient and effective HVAC system tailored to their specific needs.

Finally, the Carrier 50PG03-07 meets stringent industry standards for safety and performance, providing users with peace of mind. With its blend of innovative technology, energy efficiency, and construction resilience, the 50PG03-07 remains a popular choice for businesses seeking reliable climate control solutions.
Top Page Image Contents