ICP NAC248AKA1 - User Manual

This document provides comprehensive installation, startup, and maintenance instructions for Split System Performance Line AC & HP Condensers. It emphasizes safety, proper installation techniques, and routine care to ensure optimal performance and longevity of the unit.

Function Description

The Split System Performance Line AC & HP Condensers are designed to provide efficient cooling and heating for residential and commercial applications. These outdoor units work in conjunction with an indoor evaporator coil and furnace/air handler to form a complete HVAC system. The condenser's primary function is to release heat to the outdoors during cooling cycles and absorb heat from the outdoors during heating cycles (for heat pump models), thereby regulating indoor temperature. The system utilizes R-22 refrigerant, and proper charging and line sizing are critical for its operation.

Usage Features

The manual details several key aspects related to the usage and setup of the condenser units:

Installation Environment: Units should be installed on a level, well-drained area, supported by a pad or platform made of permanent materials like concrete, bricks, or pressure-treated timbers. For rooftop installations, the supporting structure must be level and capable of bearing the unit's weight, with provisions for water drainage and noise/vibration isolation. It is recommended to avoid locating units near fresh air intakes, vent, or bedroom windows to minimize noise disturbance.
Clearances: Specific clearances are mandated for optimal airflow and serviceability. A nominal operating clearance of 60 inches (150 cm) above the unit for discharge air and 24 inches (40 cm) around the coil for intake air on three sides is required. One side clearance can be reduced to 12 inches (30 cm) if it's between the unit and a solid parallel object. Special considerations are given for inside corner locations and multiple unit installations. A service clearance of 24 inches (60 cm) from the control box end or side is desirable for maintenance access.
Refrigerant Line Installation: The system requires approved matched components, and the total length of refrigerant lines must not exceed 50 feet, with a maximum vertical separation of 40 feet between indoor and outdoor units. Proper installation of restrictor orifices, if required by the indoor coil match, is crucial for system performance. Refrigerant lines should be suspended using insulated hangers and kept separate to prevent noise transmission. Special instructions are provided for installations where the condensing unit is higher than the evaporator, including the need for oil traps to ensure proper oil return to the compressor.
Brazing Connections: Detailed steps for making braze connections are provided, emphasizing cleanliness, the use of nitrogen flow to prevent oxidation, and heat-absorbing paste to protect service valves. A critical warning about fire hazards due to pressurized refrigerant and oil mixture is highlighted.
Evacuation and Charging: The manual outlines a precise method for evacuating the system to 300 microns using a vacuum pump, ensuring all connections are tight. The outdoor units are precharged for 15 feet of refrigerant line, and adjustments are necessary for different line lengths. It is mandatory to perform a thorough evacuation before opening service valves to prevent charge loss.
Valve Actuation: Instructions for actuating service valves and ball valves are given, including proper torque specifications for valve caps to prevent leaks.
Electrical Wiring: All electrical connections must conform to local building codes and the National Electrical Code (NFPA 70/ANSI C1-1999) or Canadian Electrical Code Part 1 CSA C.22.1. The supply voltage should be 208-230 volts (60Hz single phase). Only copper conductors are approved. The unit must be permanently grounded. Line voltage wiring should be routed through raintight conduit, and low voltage wiring should be kept separate and connected to pigtails in the designated area.
Startup Procedure: A step-by-step startup procedure is provided, including energizing the crankcase heater, setting the thermostat, and operating the unit for 15-20 minutes before checking the refrigerant charge.
Refrigerant Charge Adjustment (Cooling Mode): For optimum performance, the system should achieve 15°-20° F suction superheat at the compressor with specific outdoor and indoor ambient conditions. A temperature/pressure chart and recommended superheat values are provided to guide adjustments.
Airflow: Establishing proper indoor blower airflow (350-450 CFM per ton) is crucial before adjusting the refrigerant charge.
Heating Checkout (Heat Pump Only): A detailed procedure for checking the heating mode, including thermostat settings, blower operation, and auxiliary heat engagement, is outlined.
Refrigerant Charge Adjustment (Heating Mode): For heat pump models with an outdoor restrictor orifice, optimum heating performance is achieved with 10°-20° F suction superheat at the compressor under specific ambient conditions. Charge adjustments in heating mode are primarily done by weight.
Defrost System (Heat Pump Only): The electronic defrost system has adjustable time intervals (30, 60, or 90 minutes) and is factory set at 60 or 90 minutes. It activates when the outdoor coil temperature is approximately 28°F and terminates when the sensor detects a rise to approximately 10 minutes. The interval can be adjusted for complete ice removal, especially in high humidity areas.

Maintenance Features

The manual emphasizes the importance of regular maintenance for efficient and long-lasting operation:

Safety First: Always shut off electric power at the fuse box or service panel before performing any electrical connections or cleaning to prevent electrical shock hazards.
Condensate Drain: During the cooling season, the condensate drain should be checked monthly for free flow and cleaned if necessary.
Cleanliness: Maintaining free airflow is essential. The outdoor coil should be kept clean and free of restrictions from fences, shrubs, snow drifts, grass clippings, weeds, and other debris.
Coil Cleaning: Coils may require cleaning with an alkaline-based cleaner only when cold. Cleaning a hot coil or using an acid-based cleaner can damage the paint on the fins and potentially clog the coil.
Weather Covers: If a weather cover is used, it must be a ventilated type or made of breathable fabric to allow moisture to evaporate rapidly. Covers that trap moisture can lead to rust buildup and damage.
Defrost Control Adjustment: For heat pump models, the defrost frequency can be adjusted by moving a jumper clip on the electronic defrost control board to select 30, 60, or 90-minute intervals.
Yearly Maintenance: The warranty coverage requires yearly maintenance by a qualified dealer, with satisfactory proof of service needed for warranty claims. This ensures the unit operates efficiently and any potential issues are addressed promptly.

The document also includes a Limited Warranty Certificate, detailing the terms, conditions, and exclusions of the warranty for various components, including heat exchangers, compressors, and other functional parts. It specifies different warranty periods for residential and commercial applications and emphasizes the need for proper installation, operation, and yearly maintenance to keep the warranty valid.

ICP NAC248AKA1 Specifications

General

Category	Air Conditioner
Seasonal Energy Efficiency Ratio (SEER)	16
Refrigerant	R410A
Model	NAC248AKA1
Heating Seasonal Performance Factor (HSPF)	9.0
Power Supply	208-230V/60Hz/1Ph
Cooling Capacity	24000 BTU/h
Heating Capacity	24000 BTU/h