FB4C(S,Q)L Fan Coil Units - Installation Instructions

Oct 22, 2026

Uploaded by dbqoiu

Installation instructions for FB4C(S,Q)L R-410A fan coil units (50 Hz) covering safety considerations, equipment checks, mounting options, airflow and ducting requirements, and key electrical and refrigerant connection steps. The manual explains orientation flexibility (upflow, downflow with kit, and horizontal), condensate drain provisions, filter requirements, and operational sequencing. Includes start-up procedures, care and maintenance guidance, and performance tables with dimensional drawings and airflow-related charts for compliant installation and reliable operation.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages19

Reading Time48 min

AccessFree to download

Safety Considerations

Introduction

Installation

Step 1—Check Equipment

Step 2—Mount Unit

Step 3—Air Ducts

Step 4—Electrical Connections

Step 5—Refrigerant Tubing Connection and Evacuation

Step 6—Refrigerant Flow-Control Device

Step 7—Condensate Drains

Step 8—Accessories

Step 9—Sequence of Operation

Start-up Procedures

Care and Maintenance

Airflow Performance Tables

Marking Chart

Dimensional Drawings

FB4C(S,Q)L FAN COIL UNITS FOR R-410A REFRIGERANT SIZES 018 TO 060 50 Hz Installation Instructions NOTE: Read the entire instruction manual before starting the installation. TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS ........................ 1 INTRODUCTION .................................. 1 INSTALLATION ................................... 1 Step 1—Check Equipment ......................... 1 Step 2—Mount Unit .............................. 2 Step 3—Air Ducts ............................... 3 Step 4—Electrical Connections ..................... 4 Step 5—Refrigerant Tubing Connection and Evacuation .. 6 Step 6—Refrigerant Flow-Control Device ............. 6 Step 7—Condensate Drains ........................ 6 Step 8—Accessories .............................. 7 Step 9—Sequence of Operation ..................... 7 START-UP PROCEDURES .......................... 8 CARE AND MAINTENANCE ........................ 8 AIRFLOW PERFORMANCE TABLES ................. 9 Marking Chart .................................... 10 Dimensional Drawings ............................. 11 SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with kits or accessories when installing. Follow all local safety codes. Wear safety glasses, protective clothing and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and the current editions of the National Electrical Code (NEC) and NFPA 70 . Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instruction manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. | ! WARNING | | --- | | ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing unit, always turn off all power to unit. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Lock out and tag switch with a suitable warning label. | | ! CAUTION | | --- | | CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts. | INTRODUCTION FB4C models are R-410A Fan Coils designed for installation flexibility. These units are designed to meet the low air leak requirements currently in effect. A TXV is used on FB4C(S,Q)L. This valve is a bleed-through type and adjustable (if necessary) . All FB4C fan coils use a multi-tap ECM motor for efficiency. These units have been designed for upflow, downflow (kit required), and horizontal orientations. These units require a field supplied air filter, and are designed specifically for R-410A refrigerant 50 Hz air conditioners. These units are available for systems of 18,000 through 60,000 BTUh nominal cooling capacity.See Product Data literature for all available accessory

FAQs

What safety steps are required before installing the fan coil unit?

Follow all local safety codes and use protective equipment such as safety glasses, protective clothing, and work gloves. Turn off all power to the unit before installing or servicing, and lock out and tag the switch if needed. Keep warnings and cautions in the manual and on the unit in mind.

What orientations are supported for FB4C(S,Q)L installation?

The units are designed for upflow, downflow (requires an accessory kit), and horizontal orientations. The installation method should match the required gasket, duct openings, and orientation-specific requirements.

What components are required or used for R-410A operation in these units?

A field-supplied air filter is required, and the units are designed specifically for R-410A refrigerant. A TXV is used on FB4C(S,Q)L, and the units use a multi-tap ECM motor for efficiency. Condensate drains and related components must be installed according to the instructions.

Oct 22, 2026

Uploaded by dbqoiu