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Physical dimensions, connections, and component locations of the cased coil.
Installer responsibility for compliance with national and local codes.
Procedures for inspecting the unit for shipping damage upon receipt.
Required clearances for installation, maintenance, and service access.
How to obtain authorized replacement parts through the distributor.
Read all instructions and gather necessary tools and supplies before starting installation.
Steps for installing the cased coil and connecting the condensate drain trap.
Guidelines for condensate drain piping, including optional drain pans and trap installation.
Instructions and warnings for installing the plastic drain pan and its connections.
Steps for installing or replacing the piston metering device, including size selection.
Procedure for installing the optional TXV kit for specific efficiency requirements.
This document is an installer's guide for Oxbox multi-position cased coils, designed for use with cooling and heat pump systems. These coils feature a factory-installed R410a metering device. The guide emphasizes safety, providing detailed instructions for installation, operation, and maintenance to ensure proper functioning and prevent potential hazards.
The manual begins with critical safety information, highlighting the importance of qualified and trained service personnel for installation and repair. It warns against improper installation, adjustment, service, or maintenance, which could lead to fire, electrical shock, property damage, personal injury, or death. It also specifies that the appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless supervised. Children should also be supervised to prevent them from playing with the appliance. A Proposition 65 warning is included, stating that the appliance contains fiberglass insulation, which is known to the state of California to cause cancer.
The general section of the guide explains that the coil can be positioned for bottom return air in upflow and horizontal right applications, and for top return in downflow and horizontal left applications. For furnace applications, the coil must be installed downstream (in the air outlet) of the furnace. A factory-installed heat shield is present on the drain pan. Unit dimensions are provided with a detailed diagram showing connections for vapor line, liquid line, primary drain, and auxiliary drain, all with 3/4" NPT female pipe threads.
The guide stresses compliance with national and local codes and regulations, noting that the manufacturer is not responsible for equipment installed in violation of these codes. It also mentions the United States Environmental Protection Agency (EPA) regulations regarding refrigerants and warns against the environmental harm and substantial fines that can result from non-compliance. Upon unit arrival, installers are instructed to inspect for shipping damage, as the carrier is responsible for such costs.
Clearances for installation are specified, including space for maintenance and service access (coil cleaning and assembly removal), refrigerant piping and connections, and the condensate drain line. Proper installation requires a solid and level site with sufficient space for installation and maintenance.
Installation instructions detail the process for cased coils. Installers must first shut off or disconnect power to the gas furnace and remove the gas pipe if necessary. The supply ductwork needs to be disconnected and removed to provide clearance for the cased coil. It is crucial to ensure the coil is level and to seal any gaps between the coil and furnace. If coil and furnace sizes do not match, sheet metal or other material should be used to fill and seal the gap to prevent air leaks. The ductwork must then be reconnected to the coil case and sealed. Finally, the power line on the gas furnace should be reconnected.
For horizontal left orientation with an upflow furnace, a sheet metal transition may be installed between the furnace supply air outlet and the evaporator coil supply air inlet to create clearance between the coil lineset and furnace flue outlet. Specific transition sizes are provided for A-cabinet non-condensing furnaces (6") and all cabinet size condensing furnaces (6.5"). If space is an issue, the coil can be rotated to remove lines/flue interference, optimizing airflow.
The drain application section provides instructions for condensate drain piping. Installers are advised to consult local codes for specific requirements. An additional drain pan, provided by the installer, is recommended under the entire unit with a separate drain line for extra protection against water damage. The manufacturer will not be responsible for damages due to failure to follow this recommendation. A warning is given against using the coil pan shipped with the unit on oil furnaces or in applications where the drain pan temperature may exceed 275°F; a field-fabricated metal drain pan should be used instead.
A trap must be installed in the drain line below the drain pan. If using copper, a short piece of pipe should be soldered to the connector before installing the drain fitting. Installers are warned not to overtighten the 3/4" copper connector to the plastic drain connection. A wet rag or heatsink material should be used to protect the plastic drain pan during soldering. Teflon tape is recommended for drain line connections, and pipe joint compound or PVC/CPVC cement should not be used on the drain nipple. The coil drain pan has primary and optional secondary drains with 3/4" NPT female connections, which should be hand-tightened to approximately 37 in-lbs. An insertion depth of 0.355 to 0.485 inches (3-5 turns) is expected at this torque setting. Male 3/4" NPT threaded fittings should be used for outside connections, ensuring drain holes are not blocked. Insulation may be needed for the drain line to prevent sweating. The drain pan has two connections on each side for flexibility; the unused connection should be plugged. If a secondary drain line is required, it should be run separately from the primary drain and terminated where it can be easily seen, as water from this line indicates a plugged primary drain.
Refrigerant connections require careful handling. Installers are instructed to gently remove the sealing plug of the vapor line, using two wrenches to loosen the nut and remove the flange pad and sealing ring. Proper tools are essential for clean, burr-free cuts to prevent refrigerant leaks. A caution is given to protect the TXV bulb (wrapped with a wet rag or removed) while brazing the tubing, as overheating will affect the functional characteristics and performance of the coil. Brazing shields should be used near cabinet surfaces, and wet rags to protect rubber grommets. Brazing alloy should contain at least 5% silver.
The piston/TXV installation section notes that a piston comes pre-installed and must be removed before installing a TXV. For piston installation, the nut should be loosened with a wrench, and the nut and sealing flange removed. The correct piston size must be chosen based on the outdoor/coil combination from Table 6-1. If a different size piston is needed, the pre-installed piston must be removed, avoiding pulling out the piston sleeve. The correct piston from the doc pack should be inserted with the correct orientation. The outer O-ring should be replaced with the one provided in the doc pack. The connection pipe with nut should be attached and tightened to 1/6th turn past hand-tighten, with a wet rag wrapped around the nut during brazing. The guide mentions that some system combinations may require a different sized piston to be field installed, and refers to the outdoor unit for piston size recommendations or Table 6-2 if not listed.
For optional TXV kit installation, the nut should be loosened, and the sealing flange and gasket removed. The connecting pipe from the accessory package should be brazed onto the refrigeration-out pipe. Sealing washers, TXV, and flange connection tube are then installed, and the nut and connecting pipe fastened with a wrench (18±2N·m). The TXV equalizer pipe is connected to the port on the connecting pipe, and bulbs are fixed to the connecting pipe using accessories from the TXV kit. A warning states that failure to install the proper piston can lead to poor system performance and compressor damage. A caution advises that an improperly charged system can cause loss in performance and damage to the compressor. The guide refers to AHRI for system combination ratings and Table 6-2 for charging the system by superheat when using a piston, or the outdoor unit installation guide when using a TXV.
The airflow performance section provides pressure drop characteristics for cooling and heat pump coils, with data based on wet coil with entering air at 80 degF DB / 67 degF WB without an air filter. The maximum allowable pressure drop is 0.4 IWG, and the maximum CFM is the data at 0.4 IWG pressure. A note warns that water blow-off could occur if the airflow setting exceeds the maximum values listed in the maximum airflow setting (CFM) table for different installation positions (Upflow, Horizontal Left, Downflow, Horizontal Right). The chart is based on 400CFM/Ton indoor airflow and 50% relative humidity, advising to use indoor wet bulb temperature only if indoor relative humidity is above 70% or below 20%. The airflow range is 375 to 425 CFM/Ton.
The document concludes with contact information for Twenty ThreeC, LLC and a statement that the manufacturer reserves the right to change the design and specification without notice due to a policy of continuous product improvement.
General| Brand | Trane |
|---|---|
| Model | Oxbox J4MXCC009EC6HCA |
| Category | Air Conditioner |
| Language | English |
