SERVICE

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

Cleaning Ð Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.

MAIN AND PILOT BURNERS Ð At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the pilot and main burner ¯ames through view port (in condenser section), and adjust if necessary. Refer to Pilot Adjustment or Main Burners sec- tions on pages 22 and 23.

FLUE GAS PASSAGEWAYS Ð The ¯ue collector box and heat exchanger cells may be inspected by removing heat ex- changer access panel (Fig. 4 and 5), ¯ue box cover, and main burner assembly (Fig. 25). Refer to Main Burners section on page 23 for burner removal sequence. If cleaning is re- quired, remove heat exchanger turbulators (Fig. 26) and clean all parts with a wire brush.

COMBUSTION-AIR BLOWER Ð Clean periodically to as- sure proper air¯ow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the ®rst heating season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

To inspect blower wheel, remove heat exchanger access panel. Shine a ¯ashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel assembly by removing screws holding motor mounting plate to top of com- bustion fan housing (Fig. 25 and 26). The motor and wheel assembly will slide up and out of the fan housing. Remove the blower wheel from the motor shaft and clean with a de- tergent or solvent. Replace motor and wheel assembly.

EVAPORATOR COIL Ð Clean as required with commer- cial coil cleaner.

CONDENSER COIL Ð Clean condenser coil annually and as required by location and outdoor-air conditions. Inspect coil monthly; clean as required.

CONDENSATE DRAIN Ð Check and clean each year at start of cooling season. In winter, keep drains and traps dry.

FILTERS Ð Clean or replace at start of each heating and cooling season, or more often if operating conditions re- quire. Refer to Table 1 for type and size.

OUTDOOR-AIR INLET SCREENS Ð Clean screens with steam or hot water and a mild detergent. Do not use dis- posable ®lters in place of screens.

Lubrication

COMPRESSORS Ð Each compressor is charged with the correct amount of oil at the factory. Observe the level in the sight glass immediately after shutdown while the oil is still warm. If the oil level is observed when the oil is cold, the level observed may be a mixture of oil and refrigerant which is not a true indication of the oil level. If oil level observed is not between the low limit and high limit levels as indi- cated in Fig. 27, add oil until it is in the correct range.

Fig. 25 Ð Typical Gas Heating Section

(48HJE015, 48HJE017, and 48HJD025 Shown)

Fig. 26 Ð Typical Heating Section With

Main Burners Removed

(48HJE015, 48HJE017, and 48HJD025 Shown)

Fig. 27 Ð Compressor Sight Glass Oil Level

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Carrier 48HJ015-025 installation instructions Service, Lubrication
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48HJ015-025 specifications

The Carrier 48HJ015-025 is a distinguished series of rooftop packaged units renowned for their efficient performance and reliability in light commercial applications. Designed for a variety of indoor environments, these units are engineered to provide efficient heating and cooling solutions, making them suitable for retail spaces, offices, and other commercial buildings.

One of the main features of the Carrier 48HJ series is its advanced scroll compressor technology, which enhances the overall efficiency of the systems. This type of compressor is known for its durability and quiet operation, providing consistent temperature control while minimizing energy consumption. The use of a scroll compressor contributes to a higher Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF), making these units a smart choice for energy-conscious businesses.

Additionally, the 48HJ series incorporates a multi-speed indoor blower that allows for precise airflow control. This feature ensures optimal indoor comfort by adjusting the air distribution based on the specific heating or cooling needs of the space. The ability to adapt to varying load conditions enhances efficiency and reduces energy wastage.

Another noteworthy characteristic of the Carrier 48HJ015-025 is its robust construction. Built with galvanized steel, the units are designed to withstand harsh environmental conditions, ensuring longevity and minimal maintenance requirements. The powder-painted finish offers corrosion resistance, contributing to the unit’s durability over time.

The series also integrates advanced controls for ease of operation. The user-friendly thermostat enables precise temperature management and can be programmed according to the specific needs of the facility. Moreover, compatibility with Building Management Systems (BMS) facilitates seamless integration into existing infrastructure, enabling remote monitoring and enhanced operational efficiency.

In terms of environmental considerations, the Carrier 48HJ series utilizes R-410A refrigerant, which is known for its reduced impact on the ozone layer compared to older refrigerants. This commitment to sustainability aligns with modern environmental standards and regulations.

Overall, the Carrier 48HJ015-025 stands out as a versatile and efficient rooftop packaged unit, perfect for varying commercial applications. Its combination of advanced technology, reliability, and user-focused design makes it a prominent choice for businesses seeking optimized climate control solutions while ensuring sustainability and energy efficiency.
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