Payne PF4MNB - User Manual

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PF4MNB

DIRECT EXPANSION

FAN COIL UNIT

Installation Instructions

FOR R410A REFRIGERANT

SIZES 019 TO 061

NOTE: Read the entire instruction manual before starting the

installation.

TABLE OF CONTENTS

PAGE

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

INTRODUCTION 1..................................

HEATER PACKAGES 1..............................

INSTALLATION 1...................................

Step 1 − Check Equipment 2..........................

Step 2 − Mount Unit 2...............................

Step 3 − Air Ducts 4................................

Step 4 − Electrical Connections 4......................

Step 5 − Refrigerant Tubing Connection and Evacuation 7...

Step 6 − Refrigerant Flow−Control Device 7..............

Step 7 − Condensate Drains 8.........................

Step 8 − Accessories 9...............................

Step 9 − Sequence of Operation 9......................

START−UP PROCEDURES 9..........................

CARE AND MAINTENANCE 9........................

AIRFLOW PERFORMANCE TABLES 10................

R−410A QUICK REFERENCE GUIDE 12................

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 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) NFPA 70.

In Canada, refer to the current editions of the Canadian Electrical

Code CSA C22.1.

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.

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 1 disconnect switch. Turn off

accessory heater power if applicable. Lock out and tag switch

with a suitable warning label.

WARNING

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.

CAUTION

INTRODUCTION

Model PF4MNB Fan Coils are designed for flexibility and can be

used for upflow, horizontal, or downflow (kit required) and

manufactured and mobile home applications. These units leave the

factory compliant with low leak requirements of less than 2%

cabinet leakage rate at 0.5 inches W.C. and 1.4% cabinet leakage

rate at 0.5 inches W.C. when tested in accordance with ASHRAE

193 standard. Because of this, the units need special attention in the

condensate pan and drain connection area and when brazing

tubing.

These units are designed specifically for R−410A refrigerant and

must be used only with R−410A refrigerant air conditioners and

heat pumps as shipped. These units are available for systems of

18,000 through 60,000 Btuh nominal cooling capacity.

Factory−authorized, field−installed electric heater packages are

available in sizes 5 through 30kW. See Product Data literature for

available accessory kits.

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Summary

Safety Considerations and Warnings

INSTALLATION

Equipment Check and Inspection

Unpacking and inspecting the unit for damage and specifications.

Unit Mounting Guidelines

Guidelines for mounting the unit in various configurations.

Upflow Installation Procedures

Specific instructions for upflow unit installation.

Downflow Installation Procedures

Procedures for converting the unit for downflow installation.

Horizontal Installation Requirements

Requirements for installing the unit in a horizontal orientation.

Air Duct Connections

Connecting supply and return air ducts to the unit.

Electrical Wiring and Connections

Procedures for making field high- and low-voltage wiring connections.

Refrigerant Tubing and Evacuation

Connecting refrigerant tubing and evacuating the system.

Refrigerant Flow Control Device (TXV)

Details on the unit's TXV and its requirements.

Condensate Drain Installation

Installing primary and secondary condensate drain lines with traps.

Accessory Installation

Information on installing optional accessories like electric heaters.

Unit Sequence of Operation

Explains how the unit operates in different modes.

Care and Maintenance Guidelines

Airflow Performance Data Tables

R-410 A Refrigerant Quick Reference

The PF4MNB Direct Expansion Fan Coil Unit is designed for use with R-410A refrigerant and is available in sizes ranging from 019 to 061. It offers flexible installation options, supporting upflow, horizontal, and downflow (with a kit) configurations, and is suitable for both standard and mobile home applications.

Function Description:

The fan coil unit is a key component in a heating, ventilation, and air conditioning (HVAC) system, responsible for circulating air and facilitating heat exchange. When connected to an R-410A air conditioner or heat pump, it provides cooling or heating to the conditioned space. The unit utilizes a direct expansion coil to transfer heat to or from the air. Factory-authorized, field-installed electric heater packages are available in sizes from 5 to 30kW, allowing for supplemental electric heat.

Important Technical Specifications:

Refrigerant: Specifically designed for R-410A refrigerant.
Cooling Capacity: Available for systems with 18,000 through 60,000 Btuh nominal cooling capacity.
Leakage Rate: Compliant with low leak requirements, exhibiting less than 2% cabinet leakage rate at 0.5 inches W.C. and 1.4% cabinet leakage rate at 0.5 inches W.C. when tested according to ASHRAE 193 standard.
Electrical: The low voltage circuit is protected by a 5 amp automotive type fuse. The fan motor has multiple speed taps (1, 2, 3, 4, 5) for airflow selection. Speed taps 1, 2, and 3 have a 90-second blower off time delay pre-programmed into the motor. Speed tap 4 (electric heat) and speed tap 5 (high static applications) have a 0-second blower off time delay.
Transformer: Factory-wired for 230v operation, with an option for 208v applications by reconnecting a black wire.
Ductwork Clearance: Units with 20-30kW electric heaters require a 1-inch (25 mm) clearance to combustible materials for the first 36-inches (914 mm) of supply duct.
Condensate Drains: Equipped with primary and secondary 3/4-inch FPT drain connections. Proper condensate traps are required, with a minimum depth of 2 inches (51 mm).
Filter: Requires a filter for operation; never operate without one to prevent damage to the blower motor or coil.

Usage Features:

Installation Flexibility: Can be installed in upflow, horizontal (left or right), or downflow configurations. Downflow requires an accessory kit. Horizontal right conversion for A-coils and slope coils involves specific steps for reconfiguring internal components and drain pans.
Modular Design: Units can be disassembled for easier transport and reassembly in confined installation spaces.
Low Air Leakage: Special attention is given to sealing the condensate pan and drain connections, and when brazing tubing, to maintain the low air leak performance. Gasket kits are required for downflow and horizontal slope coil conversions to maintain performance.
Motor Speed Selection: Fan speed is selected at the motor connector using different taps (1, 2, 3, 4, 5) to achieve desired CFM. Lower motor speed taps are recommended for low static applications to reduce the possibility of water being blown off the coil.
Refrigerant Flow-Control: Equipped with an R-410A refrigerant TXV. If using with a single-phase reciprocating compressor, a compressor start capacitor and relay are required.
Condensate Management: Requires proper installation of primary and secondary condensate traps. For installations in or above living spaces, a field-supplied external condensate pan or a separate secondary condensate line (with appropriate trap) is recommended to prevent water damage.
Electrical Connections: Requires a separate branch electric circuit with a field-supplied disconnect switch. Low voltage wiring (24-v control system) should use 18 AWG color-coded, insulated wire (35°C minimum) for runs up to 100 ft (30 m), and 16 AWG for longer runs. All wiring must comply with NEC Class 1 and be separated from incoming power leads.
Heater Staging: If electric heat staging is required, a multi-stage heating room thermostat is necessary. For manufactured housing, supplemental electric heat may need to be locked out at outdoor temperatures above 40°F (4°C), except during a heat pump defrost cycle.
Humidifier Connection: Humidifiers and humidistats can be connected to the fan coil unit, with an optional cooling lockout relay.

Maintenance Features:

Filter Replacement/Cleaning: The only consumer service recommended or required is monthly filter replacement or cleaning.
Professional Maintenance: Periodic maintenance by a qualified installer or service agency is essential to ensure high performance and minimize equipment failure.
Safety Precautions: Before installing or servicing, all power to the unit must be turned off, and the switch locked out and tagged. Brazing requires a shield to prevent damage to the unit surface and condensate pan fitting caps. A wet cloth should be wrapped around the rear of fittings when brazing to protect the TXV and factory-made joints.
R-410A Specifics: R-410A operates at higher pressures than R-22, requiring servicing equipment and components designed for R-410A. Recovery cylinders must be rated 400 psig. Systems should be charged with liquid refrigerant. POE oils used with R-410A absorb moisture rapidly and should not be exposed to atmosphere. A factory-approved liquid-line filter drier is required on every unit, and suction-line filter driers should not remain in line longer than 72 hours. Never vent R-410A refrigerant into the atmosphere.

Payne PF4MNB Specifications

General

Brand	Payne
Model	PF4MNB
Category	Fan
Language	English