Carrier WeatherMaker 50FCQ 04 Series

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500246-01 Printed in U.S.A. Form 50FCQ-4-7-01SI Pg 1 4-2020 Replaces: New

Installation Instructions

CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1

MODEL NUMBER NOMENCLATURE AND

DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Jobsite Survey . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . 7

Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . 7

• ROOF MOUNT

Step 2 — Plan for Sequence of Unit Installation . . . 7

• CURB-MOUNTED INSTALLATION

• PAD-MOUNTED INSTALLATION

• FRAME-MOUNTED INSTALLATION

Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7

Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . 7

• ROOF CURB MOUNT

• SLAB MOUNT (HORIZONTAL UNITS ONLY)

• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR

SLAB MOUNT)

Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 9

• FOR UNITS WITH ACCESSORY ELECTRIC HEATERS

Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 9

• POSITIONING ON CURB

Step 7 — Convert to Horizontal and Connect

Ductwork (when required) . . . . . . . . . . . . . . . . . . 10

Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 11

• ECONOMIZER HOOD AND TWO-POSITION DAMPER

HOOD PACKAGE REMOVAL AND SETUP (FACTORY

OPTION)

• ECONOMIZER AND TWO-POSITION HOOD

Step 9 — Units with Hinged Panels Only . . . . . . . . 12

Step 10 — Install External Condensate Trap

and Line . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . 12

Step 11 — Make Electrical Connections . . . . . . . . . 12

• FIELD POWER SUPPLY

• UNITS WITH FACTORY-INSTALLED NON-FUSED

DISCONNECT

• UNITS WITHOUT FACTORY-INSTALLED

NON-FUSED DISCONNECT

• ALL UNITS

• CONVENIENCE OUTLETS

• FACTORY OPTION THRU-BASE CONNECTIONS

• FIELD CONTROL WIRING

• THERMOSTAT

• UNIT WITHOUT THRU-BASE CONNECTION KIT

• HEAT ANTICIPATOR SETTINGS

• COMMERCIAL DEFROST CONTROL

• ELECTRIC HEATERS

• SINGLE POINT BOXES AND SUPPLEMENTARY

FUSES

• SINGLE POINT BOXES WITHOUT FUSES

• LOW-VOLTAGE CONTROL CONNECTIONS

• CONTROL AND POWER WIRING DIAGRAMS

EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . .31

• SYSTEM COMPONENTS

• SPECIFICATIONS

• INPUTS

• OUTPUTS

• ENVIRONMENTAL

• ECONOMIZER MODULE WIRING DETAILS

• INTERFACE OVERVIEW

• SETUP AND CONFIGURATION

• ENTHALPY SETTINGS

• TWO-SPEED FAN OPERATION

• CHECKOUT

• TROUBLESHOOTING

RTU Open Controller (Factory Option) . . . . . . . . . .44

SystemVu™ Controller (Factory Option) . . . . . . . . .44

Controller Options . . . . . . . . . . . . . . . . . . . . . . . . . . .44

• LOW AMBIENT

Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

• COMPLETING RETURN AIR SMOKE SENSOR

INSTALLATION

• ADDITIONAL APPLICATION DATA

Step 12 — Adjust Factory-Installed Options . . . . . .44

• SMOKE DETECTORS

• ECONOMI$ER IV OCCUPANCY SWITCH

Step 13 — Install Accessories

. . . . . . . . . . . . . . . . .45

Step 14 — Fan Speed Set Up . . . . . . . . . . . . . . . . . .46

• UNITS WITH ELECTRO-MECHANICAL CONTROLS

• UNITS WITH SYSTEMVU™ CONTROLS

Typical Unit Piping . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .49

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,

maintenance, or use can cause explosion, fire, electrical shock or

other conditions which may cause 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 the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use

quenching cloths for brazing operations and have a fire

extinguisher available. Read these instructions thoroughly and

follow all warnings or cautions attached to the unit. Consult local

building codes and appropriate national electrical codes (in USA,

ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA

C22.1) for special requirements.

It is important to recognize safety information. This is the safety-

alert symbol . When you see this symbol on the unit and in

instructions or manuals, be alert to the potential for personal

injury.

WeatherMaker

50FCQ*04-07

Single Package Rooftop Heat Pump

with Puron

(R-410A) Refrigerant

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Overview

Device Description

The provided document is an installation manual for Carrier WeatherMaker® 50FCQ*04-07 Single Package Rooftop Heat Pumps with Puron® (R-410A) Refrigerant. It details the installation, operation, and maintenance of these units, including various optional accessories and control systems.

Device Description

The Carrier WeatherMaker® 50FCQ*04-07 is a series of single-package rooftop heat pumps designed for commercial applications. These units utilize Puron® (R-410A) refrigerant and are available in cooling capacities of 3, 4, 5, and 6 tons (models 04, 05, 06, and 07 respectively). The manual provides comprehensive instructions for proper installation, ensuring safety, optimal performance, and compliance with local building and electrical codes.

Function Description: The 50FCQ*04-07 heat pumps are designed to provide both heating and cooling for conditioned spaces. They are single-package units, meaning all major components (compressor, indoor coil, outdoor coil, and fan motors) are housed within a single cabinet for rooftop installation. The units can be configured for vertical or horizontal duct connections, depending on the application. Various options and accessories enhance their functionality, including economizers for free cooling, electric heaters for supplementary heat, and advanced control systems for building management integration.

Important Technical Specifications:

Refrigerant: Puron® (R-410A). R-410A systems operate at higher pressures than standard R-22 systems, requiring specific service equipment.
Cooling Capacities:
- 50FCQ*04: 3 tons (Rated Indoor Airflow: 1200 cfm)
- 50FCQ*05: 4 tons (Rated Indoor Airflow: 1500 cfm)
- 50FCQ*06: 5 tons (Rated Indoor Airflow: 2000 cfm)
- 50FCQ*07: 6 tons (Rated Indoor Airflow: 2400 cfm)
Operating Weights: Range from 467 lbs (212 kg) for the 3-ton unit to 589 lbs (267 kg) for the 6-ton unit (base unit without electric heat and packaging). Additional weights apply for accessories like economizers, Cu fins, and powered outlets.
Electrical Supply: Available in various voltages including 575/3/60, 208-230/1/60, 208-230/3/60, and 460/3/60.
Control Wiring: Low-voltage control connections are Class 2.
Condensate Drain: 3/4-in. connection, requiring an external trap at least 4-in. (102 mm) deep.
Ductwork Static Pressure: Cabinet return-air static pressure should not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer.
Clearances: Minimum clearances for safety, performance, and service access are specified in the unit drawings (e.g., 18 inches operating clearance from the front).
Economizer X (W7220 Module) Specifications:
- Rated Voltage: 20 to 30 vac RMS, 50/60 Hz.
- Transformer: 100 VA maximum system input.
- Nominal Power Consumption: 11.5 VA without sensors or actuators (at 24 vac, 60 Hz).
- Relay Digital Output Rating: 1.5A run, 3.5A inrush at 0.45PF (200,000 cycles), or 7.5A inrush at 0.45PF (100,000 cycles) at 30 vac.
- External Sensors Power Output: 21 vdc ± 5% at 48mA.
- Sensors: Mixed Air (MA) analog sensor (20k NTC) required. Optional Outdoor Air (OA) sensor (20k NTC) for dry bulb changeover, OA bus sensor for enthalpy changeover, Return Air (RA) bus sensor for differential enthalpy/dry bulb changeover, and CO2 sensor for Demand Controlled Ventilation (DCV).
- Temperature Range (20k NTC): –40°F to 150°F (-40°C to 66°C).
- Temperature Accuracy (20k NTC): 0°F/+2°F.
- Temperature and Humidity (C7400S1000 S-Bus): Range –40°F to 150°F (-40°C to 65°C), 0 to 100% RH with 5% accuracy.
- Actuator Signal: 2 to 10 vdc; minimum actuator impedance 2k ohm.
- Exhaust Fan, Y1, Y2, AUX1 O Relay Outputs: Running 1.5A maximum, Inrush 7.5A maximum (at 30 vac).
- Operating Temperature (Economizer): -40°F to 150°F (-40°C to 65°C), with display operation down to -4°F (-20°C).

Usage Features:

Installation Flexibility: Units can be roof-mounted (with or without a curb), pad-mounted, or frame-mounted. They can be converted from vertical to horizontal duct configuration in the field.
Optional Accessories: The units support a wide range of accessories, including:
- Roof curbs (14-in. and 24-in.)
- Thru-base connection kits for power and control wiring
- Manual or two-position motorized outside air dampers
- EconoMi$er® IV or EconoMi$er® X (with control and integrated barometric relief) for free cooling
- Differential dry-bulb and enthalpy sensors
- Electric heaters (single point kits available)
- Low Ambient Controls
- Thermostats/Sensors
- CO2 sensors for Demand Controlled Ventilation (DCV)
- Louvered hail guards
- Phase monitor control
- Powered exhaust
Control Systems:
- Electro-mechanical Controls: Standard option, can be used with field-installed W7212 EconoMi$er® IV. The Defrost Control Board (DFB) manages defrost cycles, fan operation, and auxiliary heat.
- SystemVu™ Controls: Factory-installed option for advanced digital control and integration with Carrier Comfort Network®.
- RTU Open Multi-Protocol Controller: Factory-installed option for integration with Building Management Systems using non-CCN protocols.
Convenience Outlets: Available as unpowered (field-wired) or unit-powered (factory-installed transformer) 125-volt, 15-A GFCI duplex receptacles. A weatherproof while-in-use cover is required for field installation.
Fan Speed Set Up: For electro-mechanical units, fan speed is set via a Vdc control dial on the Unit Control Board (UCB), using a Vdc calculator chart based on CFM and ESP. For SystemVu™ units, fan speed settings (IDF VENT SPD, IDF HEAT SPD, IDF LOW COOL SPD, IDF HIGH SPD, IDF FREE COOL SPD) are configured through the SystemVu™ interface.
Economizer X (W7220 Module) User Interface: Features a 2-line, 16-character LCD display and a 4-button keypad for navigation, setup, checkout tests, and alarm monitoring. Supports hierarchical menu structure (STATUS, SETPOINTS, SYSTEM SETUP, ADVANCED SETUP, CHECKOUT, ALARMS).
Defrost Control: Time/temperature sequence control managed by the DFB. Defrost intervals (30, 60, 90, or 120 minutes) are set via DIP switches on the DFB.
Smoke Detectors: Factory-installed options for Supply Air, Return Air, or both. Return Air smoke detectors require relocation of the sensor module during installation. Units are factory-configured for immediate shutdown upon smoke detection.

Maintenance Features:

Access Panels: Hinged access panels (optional) facilitate easier service.
Filter Access: Filter access panel allows for easy filter inspection and replacement.
Troubleshooting: The economizer module (W7220) provides alarm messages on its LCD display to aid in troubleshooting. Alarms are delayed for 60 minutes after power-up to allow components to become operational. Alarms can be cleared via the keypad interface.
Pre-Start and Start-Up Checklist: A detailed checklist is provided to ensure all installation steps are completed and the unit is ready for operation, including verifying electrical connections, refrigerant pressures, and fan assembly.
Component Accessibility: The manual provides diagrams and instructions for accessing various components like the control box, indoor blower, compressor, and coils.
Gasket Maintenance: Emphasizes the importance of proper gasketing for a watertight seal and optimal unit performance.
Wiring Diagrams: Comprehensive control and power wiring diagrams are included for various configurations and control systems to assist with electrical connections and diagnostics.