mrcool MDUCC150 UNIVERSAL® A-Coils Installation Guide

Mrcool MDUCC150 UNIVERSAL® A-Coils Safety Precautions

Read Before Installation
Incorrect installation may cause serious damage or injury.
The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.

This symbol indicates ignoring instructions may cause death or serious injury.

This symbol indicates that ignoring instructions may cause moderate injury to your person, and damage to your unit, or other property.

This symbol indicates that you should NEVER perform the indicated action.

WARNING

Please read the manual in its entirety and be aware of all warnings and cautions before installing, operating, or repairing.
DO NOT install this unit in a corrosive, inflammable, or explosive environment.
DO NOT install in any environment with special requirements, such as a kitchen. These factors will affect the normal operation or shorten the service life of the unit and could cause a fire hazard or lead to serious injury. If a unit needs to be installed in an environment with special requirements, please find a unit made specifically for this purpose that has anti-corrosive and anti- explosion functions.

1. Installation must be performed by an authorized technician. Improper installation, adjustment, alteration, service, maintenance, or use could cause fire, explosion, electrical shock, property damage, personal injury, or death. The services of a professional installer are NOT required when the MRCOOL Quick Connect® Pre-Charged Line Set is used in the installation.
   Follow all safety codes.

2. Wear safety glasses, protective clothing, and work gloves.

3. Use a quenching cloth for brazing operations.

4. Have a fire extinguisher available.

5. In North America, installation must be performed in accordance with the requirements of the NEC and CEC (by authorized personnel only). Consult local building codes and NEC for special requirements.

6. The qualified installer or agency must use factory-authorized kits or accessories when installing or modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. Using non-standard parts can cause water leakage, electrical shock, or fire and may cause the unit to fail.

7. ELECTRICAL SHOCK HAZARD: Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing system, the main electrical disconnect switch must be in the OFF position. There may be more than one disconnect switch. Lock out and tag switch with a suitable warning label.

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Be careful while handling this equipment and wear gloves and protective clothing.

Product Introduction

To Our Customers;
Thank you for choosing a MRCOOL HVAC product. Please read this manual carefully before installation and operation of the Universal™ Series A-Coil to ensure correct use and handling. In addition to the safety precautions in the previous section, please adhere to the following guidelines and note our exceptions to liability.

1. This appliance can be used by children aged 8 years and older and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children should not play with the appliance. Cleaning and user maintenance should not be made by children without supervision.
2. To ensure product reliability, the unit may consume power under stand-by status to maintain normal communication, and for preheating refrigerant and lubricant. If the unit will not be used for an extended period, disconnect the power supply. Reconnect the power supply and preheat the unit prior to use.
3. Ensure you have selected the proper model for the operating environment. Improper selection may impact operating performance.
4. This product has undergone strict inspection and operational testing before leaving the factory. To avoid damage due to improper disassembly and inspection, which may impact the normal operation, please do not disassemble the unit by yourself. Please contact MRCOOL.
5. For technical assistance, please contact MRCOOL technical support at 270-366-0457.
6. If the product is malfunctioning and/or is inoperable, please contact MRCOOL technical support at the aforementioned number, as soon as possible and provide the following information:
   • Product Nameplate Contents (model number, cooling/heating capacity, product serial number, factory date)
   • Nature of Malfunction (specify the circumstances before and after the error occurred)
7. All illustrations and information in the instruction manual are for reference only. In order to improve the product, we will continuously assess and innovate. We retain the right to make necessary revisions to the product from time to time. We reserve the right to revise the contents of this manual without notice.
8. If the supply cord is damaged, it must be replaced by MRCOOL, a professional service agent or similarly qualified person in order to avoid damage to the product.
9.  MRCOOL, LLC assumes no responsibility for personal injury, property loss or equipment damage caused by improper installation and commissioning, unnecessary maintenance, or failure to follow relevant federal and state regulations, industrial standards, and the requirements of this instuction manual.
10. MRCOOL, LLC will bear no responsibilities for personal injury or property damage caused by the following:
    • Improper use of the appliance.
    • Altering, maintaining, or operating the product with non-approved equipment.
    • Altering, maintaining, or operating the product outside of the guidelines of this manual.
    • Defects caused by corrosive gas.
    • Defects caused by shipping damage.
    • Failure to abide by this instruction manual or government regulations.
    • Products made by other manufacturers.
    • Natural disasters, improper installation environment, or force majeure.

Product Description

The Universal Series® A-Coil offers the perfect combination of superior product quality, operating efficiency, operating sound levels, and value for money. The evaporator unit uses the environmentally friendly refrigerant R410A, which is chlorine-free to help prevent damage to the ozone layer.

**Main Components

**

Physical Dimensions

19-3/8 (492)
MDUCC15048/ MDUCC15060| 24-1/2 (622)| 21-1/4 (540)| 28-1/2 (724)| 22-7/8 (581)| 19-3/8 (492)

Cooling Capacity Range

Cooling capacity range as shown below:

Unit Installation

WARNING

The evaporator of the indoor unit is charged with refrigerant from the factory to maintain pressure. The cut-off valve can only be opened when the installation process and vacuuming procedure of the system have been completed.

Pre-Installation Instructions

Checking Product Received

After receiving the product, please check it for damage that may have been caused during shipping. Shipping damage is the responsibility of the carrier. Verify the model number, specifications, and accessories are correct prior to installation. The distributor or manufacturer will not accept claims from dealers for shipping damage or installation of incorrectly shipped units.

Before Installation

Carefully read all instructions for the installation prior to beginning the installation. Make sure you understand each step or procedure and any special considerations are taken into account before starting the installation. Some tools or items for the installation may need to be purchased locally. Make sure that everything that is needed to complete the installation is on hand before you begin.

Codes & Regulations 

This product is designed and manufactured to comply with national codes. It is the responsibility of the installer to ensure that the product is installed in accordance with such codes and/or any prevailing local codes/regulations. The manufacturer assumes no responsibility for any equipment installed in violation of any codes or regulations.

NOTE: The instructions contained within this manual are intended as a general guide and do not supersede local or national code in any way. Authorities who have jurisdiction should be consulted before installation.

Replacement Parts

When reporting damages, shortages, or ordering replacement/repair parts, be sure to give the complete product model and serial numbers that are stamped on the product. Replacement parts for this product are available through your contractor or local distributor.

Location

WARNING

• This coil is designed for indoor installation only. DO NOT install it outdoors.
• The coil drain pan has a maximum service temperature of 500°F (260°C). Close spacing may damage the drain pan and cause a leak. Please refer to the Product Specifications for the proper use of these coils with specific furnaces, air handlers, condensers, and line sets.

When installing the coil take into consideration the length of the refrigerant piping and try to minimize the distance as much as possible. DO NOT install the air handler in a location that is either above or below the condenser. Allow a minimum of 24 in (610 mm) in front of the unit to provide clearance for service. When installing in an area directly over a finished ceiling (such as in an attic), an emergency drain pan is required to be installed directly under the unit. Please refer to local and state codes for requirements. When this unit is installed in an area that may become wet, elevate the unit with sturdy, non-porous material. In installations that are in locations that may lead to physical damage (ex: garage), it is advised to install a protective barrier to prevent such damage.

A-Coil Orientation/Position Options

A-Coil Orientation/Position Options

When installing the Universal A-Coils in an application with a furnace, it must be installed in a position where the return air flows through the furnace first and then the A-Coils. From the A-Coils, the airflow is then supplied to the ductwork to be dispersed throughout the rooms.

Installing A-Coils with a modular blower

When installing the Universal A-Coils in an application with a modular blower, it must be installed in a position where the return air flows through the A-Coils first and then the modular blower. From the modular blower, the airflow is then supplied to the ductwork to be dispersed throughout the rooms.

Refrigerant Piping Connection

Specifications of Connection Pipe

Model

| External diameter (inch)
---|---
Gas pipe| Liquid pipe
MDUCC15024/MDUCC15036| 3/4 in| 3/8 in
MDUCC15048/MDUCC15060

Piping Preperation

NOTE: If you are installing your A-Coil with the optional MRCOOL Quick- Connect® Line Set, please skip forward to the insallation instructions for the line set on pg. 8. Once the line set installation is complete, return to step 3.5 Condensate Removal and continue installation from there.

Solder Connection

If connecting piping with solder, make sure that any cuts made to the piping are round, burr free
(use a reamer), cleaned, and at a perfect 90° angle. Make sure the line set size matches the service valve connector. DO NOT crimp the service valve connector if the piping is of a smaller diameter. Failure to follow these guidelines could result in refrigerant leaking from the piping. Refer to the illustrations below.

Screw Connection

Connect the pipe to the unit. Follow all instructions below. Use both a spanner and torque wrench. When connecting the tapered screw nut, first apply Polyolester oil (POE oil) on its inner and outer surface. Then, screw the first 3 or 4 threads by hand. Next, tighten the nut with the spanner and torque wrench. Confirm the tightening torque by referring to the following table. DO NOT overtighten the nut as it could damage it and cause the connection to leak. Keep pipe connection exposed to perform the leak test.

Condensate Removal

The drain pan has a primary and secondary drain connection. Condensate removal is performed by attaching a 3/4 in (19 mm) pipe to the evaporator coil drain pan and is terminated in accordance with local or state plumbing/HVAC codes. The installation must include a “P” style trap that is located close to the evaporator coil. DO NOT overtighten the drain connection as this could damage or distort the drain pan and cause condensate leakage. Please refer to the guidelines and illustration below to best determine how and where to run the condensate drain pipe

DO NOT connect the condensate drain pipe to a waste pipe or other pipelines which are likely to produce corrosive fumes or an odor. Connecting to these pipes could cause the fumes or odor to enter indoors and/or corrupt the unit.
DO NOT connect the condensate drain pipe into a drain pipe, as this could cause rainwater to enter the unit and cause property damage and/or personal injury.
The condensate drain pipe should be connected into a drain system specifically for the unit.

Unit Installation – OPTIONAL: No-Vac® Quick Connect® Line Set

INSTRUCTIONS FOR USE WITH NO-VAC™ QUICK CONNECT® LINE SET SOLD SEPARATELY
KINK RESISTANT, PRECHARGED, SIMPLE SECURE QUICK CONNECT, 100% CONNECTION GUARANTEE

Please read and follow the instructions and diagram below* :
Connections must be made exactly as specified to avoid system leaks and /or damage

1. Take out matching male connectors M1 and M2.

2. Remove the protective cap with the copper gasket at each stop valve on the DC INVERTER and ensure the threads are clean and complete.

3. Tighten the M1 connector to the cutoff valve 1 with a tightening force of 37 ft/lb (50 N).
   Tighten the M2 connector to the cutoff valve 2 with a tightening force of 52 ft/lb (70 N).

4. Repeat step 3 for AIR HANDLER at the other end of the LINE SET.

5. Unroll and route the LINE SET between the AIR HANDLER and the DC INVERTER.

6. Remove the protective caps of the valves at both ends of the LINE SET. Verify that all threads are clean and complete.

7. Tighten the LINE SET F1 valve to the M1 Connector (attached in step 3) with a force of 33 ft/lb (45 N). Tighten the LINE SET F2 valve
   to the M2 Connector (attached in step 3) with a tightening force of 48 ft/lb (65 N).

8. Repeat this process for the AIR HANDLER at the other end of the LINE SET.

9. At the OUTDOOR UNIT remove the protective cap at the cutoff valve switch and open the cutoff valve with a hex wrench to
   run the refrigeration circuit. If there is any fizz, grease, or another leakage, close the valve immediately and check that steps
   3 and 7 were done properly. Otherwise, immediately apply soapy water for micro-leakage detection. Soak the joints using
   a sponge or spray bottle. If any bubbles form, close the valve immediately and check that steps 3 and 7 were done properly.

10. After the correct connection, re-tighten the cutoff valve’s protection cap and cover the M1, M2 and F1, F2 connections
    with the grey insulating sleeve to help prevent condensation.

*Failure to follow the instructions provided could result in severe harm to you, this product, or other property. The manufacturer, distributor, and seller are not responsible for any harm resulting from the failure to follow instructions and the failure to follow these instructions will void any and all warranties express or implied.

Ductwork

WARNING

DO NOT operate the unit without all of the ductwork completed and installed.
DO NOT operate this product without all of the ductwork attached.

This coil is designed for a complete supply and return ductwork system. Inadequate ductwork, that restricts airflow, can affect performance and can lead to compressor or heater failure. Ductwork should be constructed in a manner that limits restrictions and has the ability to maintain suitable air velocity. the ductwork should be sealed to the unit in order to prevent leakage. The ductwork should also follow the guidelines below in regards to the return ductwork and return air filter arrangement.

• Return Ductwork: DO NOT terminate the return ductwork in an area that can introduce toxic or objectionable fumes/odors into the ductwork. These will be introduced into the coil and dispersed throughout the ductwork into indoor areas.
• Return Air Filters: Each installation must include a return air filter. This filter may be located at the coil, or externally with a return air filter grill.

Unit Installation

The furnace, air handler, and condensing unit should be installed according to the installation instructions provided with those units before the coil can be installed. Position the cased coil on top of the furnace or air handler cabinet and secure it using field-provided screws.

NOTE: If the coil is to be installed on an oil furnace, it may be necessary to have a field-installed transition between the furnace and the coil to prevent an airflow restriction and possible damage to the coil drain pan. Please refer to the oil furnace installation instructions for further details.

Sealing Ducts

WARNING

There must be an airtight seal between the bottom of the furnace and the return air plenum. Use fiberglass sealing strips, caulking, or an equivalent sealing method between the plenum and the air handler cabinet to ensure a tight seal. DO NOT allow the return air to be drawn from a room where the air handler, any gas-fueled appliance (i.e., water heater), or carbon monoxide- producing device (i.e., wood fireplace) is installed.

Ensure that the duct is secured and all joint are properly sealed to the coil cabinet flanges. All indoor cabinets MUST be taped after installation to seal against any air leaks. System performance and efficiency will be reduced if there are any leaks.

Leak Testing, Evacuating, and Charging

Refer to the outdoor unit installation instructions for leak testing, evacuating, and charging procedures. Always check the entire system for leaks before charging it.
Proper air volume must be provided over the evaporator coil. Select a blower motor speed that will provide 300-450 CFM per 12,000 Btu/h of cooling capacity (wet coil). Refer to the table 1 below for the recommended airflow volume.

Cabinet|

Recommended Volume (CFM)

---|---
Model| Width

inch (millimeter)

MDUCC15024/ MDUCC15036| 17.5 (444.5)| 800
17.5 (444.5)| 1000
MDUCC15048/ MDUCC15060| 24.5 (622.3)| 1230
24.5 (622.3)| 1510

Maintenance and Care

Regular checks of the system, maintenance, and care should only be performed by qualified, professional personnel in order to prolong the life of the unit.

Condensate Drain Pipe

Regularly check to make sure the drain pipe is not clogged and condensate drains smoothly. A clogged condensate pipe can cause the drain pan to overflow with condensate which can lead to property damage.

Checklist Before Seasonal Use

• Check inlet/outlet of indoor units for clogs.
• Check that the filter screen is securely in place.
• Check that unit is securely installed.

NOTE: If you notice something abnormal during this check, please contact the local appointed service center.

Maintenance After Seasonal Use

• Clean dust and contaminants off of the indoor unit.
• In the event, rust has started to form, apply anti-rust paint to stop it from spreading.

Parts Replacement

Purchase replacement parts from a locally appointed service center or dealer if necessary.

After-Sales Service

In case you have any issues with the quality of the unit you purchased, or just have an inquiry, please contact the after-sales service agency designated by MRCOOL.

Warranty claims should meet the following requirements:

• Installation and first run of the unit should be performed by professional personnel from a MRCOOL-appointed service center. The services of a professional are NOT required when the MRCOOL Quick Connect® Pre-Charged Line Set is used in the installation.
• Only factory-manufactured accessories can be used on the unit.
• Installation should be performed by following the instructions provided in this manual.

Warranty automatically becomes invalid if any of these requirements are not met.

The design and specifications of this product and/or manual are subject to change without prior notice.
Consult with the sales agency or manufacturer for details.

References

• MRCOOL – Comfort Made Simple
• MRCOOL – Comfort Made Simple
• Documentation – MRCOOL

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