This document is an Owner's Manual for TGM Air Conditioners, specifically for Air Handlers. It provides comprehensive information regarding the installation, operation, maintenance, and safety precautions for several models: GTA18H024A, GTA18H036A, GTA18H048A, and GTA18H060A.
Function Description:
The TGM Air Handlers are designed to provide a combination of superior product quality, operating efficiency, and sound levels, offering good value for money. These units are integral components of an air conditioning system, working in conjunction with a condensing unit. They are responsible for circulating conditioned air throughout a building via a ductwork system. The units use the environmentally friendly refrigerant R410A, which is chlorine-free, to prevent damage to the ozone layer. The air handlers can be configured for both cooling and heating operations, with optional electric heater kits available to provide supplementary heating. They are designed for indoor installation only and require a complete supply and return ductwork system for proper operation.
Important Technical Specifications:
The manual outlines several key technical specifications for the listed models:
- Physical Dimensions:
- GTA18H024A and GTA18H036A: 21-1/4 inches (540mm) width (W), 21-1/4 inches (540mm) depth (D), 48-1/4 inches (1224mm) height (H), 11-5/8 inches (295mm) A dimension, and 20 inches (508mm) B dimension.
- GTA18H048A and GTA18H060A: 24-3/4 inches (630mm) width (W), 21-1/4 inches (540mm) depth (D), 57 inches (1448mm) height (H), 11-5/8 inches (295mm) A dimension, and 20 inches (508mm) B dimension.
- Cooling Capacity:
- GTA18H024A: 2.0 tons
- GTA18H036A: 3.0 tons
- GTA18H048A: 4.0 tons
- GTA18H060A: 5.0 tons
- Optional Electric Heater (kW):
- GTA18H024A, GTA18H036A: 5/8/10 kW
- GTA18H048A, GTA18H060A: 10/15/20 kW
- Fan Motor @ 230V~, 60Hz:
- GTA18H024A, GTA18H036A: 1/2 HP, 2.1 FLA
- GTA18H048A, GTA18H060A: 1 HP, 3.2 FLA
- Filter Size (mm):
- GTA18H024A, GTA18H036A: 490×516×15
- GTA18H048A, GTA18H060A: 525×516×15
- Connection Pipe External Diameter (inch):
- All models: Gas pipe Φ3/4, Liquid pipe Φ3/8
- Electrical Parameters:
- Power supply: 208/230V-1Ph-60Hz
- Minimum circuit ampacity: 4A (for GTA18H024A/036A), 8A (for GTA18H048A/060A)
- Maximum overcurrent protection: 15A (for all models)
- Fan Performance Data: The manual includes detailed tables for each model, showing CFM (Cubic Feet per Minute) at various static pressures (Inches W.C.) and fan speed levels (1-8) for both cooling and heating (SA2) operations. This data is crucial for proper ductwork design and ensuring the unit operates within its optimal external static pressure range.
Usage Features:
- Dip Switch Configuration: The indoor fan speed can be set using eight dip switches on the indoor main control board. Higher levels correspond to higher fan speeds. This allows for customization of airflow based on installation requirements and desired comfort levels.
- Fan Delay and Shutdown: The unit incorporates a fan delay and shutdown feature after the unit is stopped at the temperature point. This function helps to dry the evaporator coil, preventing mold growth in the air duct during refrigeration, and dissipates waste heat during heating. The actual delay time is influenced by both the unit's internal setting and any settings on the temperature controller.
- Thermostat Control: The air handler connects to an external thermostat for control. The wiring diagram specifies connections for compressor control (Y), 4-way valve control (B, for heating mode), defrosting signal (D), 24V AC power supply (R), 24V common (C), indoor unit fan signal (G), and heater control signal (W1). For cooling-only units, B and D terminals are not needed. The indoor unit fan is forced to open when electric heating operates.
- Safety Features: The unit includes an overload protection switch that delays restart for 3 minutes after being turned off. LED indicators on the main board display operating status and malfunction information, such as jumper cap failure, indoor fan failure, and temperature sensor failures, aiding in troubleshooting.
Maintenance Features:
- Regular Checks: The manual emphasizes the importance of regular checks, maintenance, and care performed by professional personnel to prolong the unit's lifespan.
- Drain Pipe Maintenance: Users are advised to regularly check if the drain pipe is clogged to ensure smooth condensate drainage.
- Seasonal Use Preparation: Before seasonal use, it's recommended to check for obstructions in the indoor unit's inlet/outlet, verify reliable grounding, ensure the filter screen is properly set, and confirm the unit is firmly installed. Any abnormalities should be reported to a local service center.
- Post-Seasonal Maintenance: After seasonal use, the main power supply should be cut off, and the filter screens of indoor units should be cleaned.
- Rust Prevention: In case of rusting, anti-rust paint should be used to prevent its spread.
- Parts Replacement: Replacement parts should be purchased from a local appointed service center or dealer. Specific instructions are provided for replacing the mainboard, including transferring the old mainboard jumper cap and short-driven electrical resistance to the new mainboard.
- Troubleshooting Guide: A "Common Malfunction and Elimination" section helps users identify and address common issues like the unit not activating, immediate stops, or abnormal cooling/heating, before contacting service. This includes checking power supply, voltage, circuit breakers, airflow obstructions, temperature settings, and filter cleanliness.
- Malfunction Indicators: The LED indicators on the main board provide specific flash patterns to indicate different system failures, assisting in diagnosing problems. For example, a "light out 3S then flash once" indicates an indoor jumper cap failure, while "light out 3S then flash twice" indicates an indoor fan failure.
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