Nordyne R4GD Series - User Manual

Installation Instructions
Single Package Gas Heating/Electric Cooling
Do not store or use gasoline
or other flammable vapors
and liquids in the vicinity of
this or any other appliance.
DO NOT DESTROY. PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
WARNING:
Improper installation, ad-
justment, alteration, ser-
vice, or maintenance can
cause injury or property
damage. Refer to this man-
ual. For assistance or addi-
tional information consult a
qualified installer, service
agency, or the gas suppli-
er.
These instructions are primarily intended to assist qualified individuals experienced in the proper installation of this
appliance. Some local codes require licensed installation/service personnel for this type of equipment. Read all
instructions carefully before starting the installation.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any
appliance.
• Do not touch any electrical
switch; do not use any phone
in your building.
• Immediately call your gas
supplier from a neighbor's
phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas
supplier, call the fire
department.
• Extinguish any open flame.
High Efficiency
FOR YOUR SAFETY
!

Summary

GENERAL SPECIFICATIONS

Equipment Check

Inspect unit for damage after unpacking and file claims with carrier.

Requirements and Codes

Installer must comply with all local codes and national standards for installation.

Unit Location

Choose outdoor location for unit to minimize duct length and ensure service access.

Venting Requirements

Unit has integral venting system and must be vented outdoors.

SAFETY CONSIDERATIONS

Literature, Labels, and Tags

Follow precautions in literature, on tags, and on labels provided with the unit.

Pressures Within The System

Unit contains high pressure refrigerant; service by qualified personnel only.

INSTALLATION REQUIREMENTS

Equipment Application

Verify unit model is correct for job; not for temporary heating.

DIMENSIONS

Clearances to Combustible Materials

Thermostat

Air Filter Requirements

UNIT INSTALLATION

Ground Level

Install on a level concrete pad at least 2" above grade in a well-draining area.

Rigging and Hoisting

Use adequate lifting equipment and spreader bars; keep unit upright.

Rooftop

Use appropriate accessory roof curb and follow instructions; ensure roof can handle weight.

AIR SUPPLY FOR COMBUSTION AND VENTILATION

CIRCULATING AIR SUPPLY

GAS SUPPLY AND PIPING

Horizontal to Down Flow Conversion

Steps to convert unit from horizontal to downflow duct connections.

GAS AND HIGH ALTITUDE CONVERSIONS

High Altitude Application

Field adjustment of manifold pressure and orifice changes for high altitudes.

Natural Gas High Altitude Conversion

Adjust manifold pressure for altitudes between 5000-10000 ft.

LP;Propane Gas Conversion

Convert unit to LP/Propane gas using approved kits and following specific instructions.

ELECTRICAL WIRING

General

Electrical wiring must comply with NEC/CSA codes and unit rating plate.

Line Voltage

Verify supply voltage, frequency, phase, and capacity match unit requirements.

Blower Speed

SYSTEM CHECK

Pre-Start Check List

Verify unit is level, airflow is clear, ductwork is sealed, and wiring is secure.

START-UP PROCEDURE

Air Circulation

Check for air delivery at the register(s). Ensure no obstructions.

System Cooling

System Heating

Verifying and Adjusting Firing Rate

Verifying and Adjusting Temperature Rise

OPERATING INSTRUCTIONS

TO TURN OFF GAS TO APPLIANCE

Steps to safely shut off the gas supply to the appliance.

COMPONENT FUNCTIONS

Flame Sensor

Proves flame presence to the ignitor; shuts down unit if no flame is sensed.

Flame Roll-Out Control

Detects flame not drawn into heat exchanger tubes; opens to shut down unit.

Gas Valve

Controls the flow of gas to the burners and regulates manifold pressure.

Pressure Switch

Verifies inducer motor draws combustion gases through the vent system.

Over-Temperature Limit Control

Prevents air temperature from exceeding maximum outlet air temperature.

UNIT MAINTENANCE

Refrigerant Charging

Routine Maintenance

Air Filter

Vent Cover Assembly

Condensate Drain and Outdoor Coil

Cleaning of Heat Exchanger

Motor Lubrication

Blower Compartment

Heat Exchanger and Burner Maintenance

Cleaning of Burners

Operating Sequence

Cooling Mode

Sequence of operation for the unit in cooling mode.

Blower Mode

Sequence of operation for the unit in blower-only mode.

Heating Mode

Sequence of operation for the unit in heating mode.

Unit Fails to Operate

INSTALLATION;PERFORMANCE CHECK LIST

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

This document provides installation and maintenance instructions for a high-efficiency single-package gas heating/electric cooling unit, designed for outdoor rooftop or ground-level slab installations. The unit is shipped ready for horizontal duct connections and can be easily converted for downflow connections. It comes equipped with a multispeed fixed torque variable speed blower and 24V fuse protection.

Function Description

The unit provides both heating and cooling capabilities. In heating mode, it utilizes gas combustion to generate warm air, which is then circulated throughout the building. The electric cooling function uses a refrigeration cycle to cool the air. The integrated control system manages the operation of various components, including the blower, gas valve, ignitor, and safety controls, to ensure efficient and safe performance in both modes.

Usage Features

• Installation Flexibility: Designed for outdoor installations, either on a rooftop with an accessory roof curb or on a ground-level concrete pad.
• Duct Connections: Shipped for horizontal duct connections, with easy conversion for downflow applications.
• Thermostat Control: Operates with a 24VAC thermostat. A single-stage cooling/single-stage heating thermostat is suitable, while a two-stage cooling/single-stage heating thermostat is recommended for economizer operation.
• Gas Type Conversion: The unit is factory-equipped for natural gas but can be converted to LP/propane gas using a special manufacturer-supplied kit. This conversion must be performed by qualified service personnel.
• High Altitude Application: For installations at higher altitudes (above 5000 ft), the unit can be adjusted by modifying the manifold pressure and, if necessary, changing the orifices.
• Safety Features: Includes several safety controls such as a flame sensor, flame roll-out control, pressure switch, and over-temperature limit control. These components monitor the unit's operation and shut it down automatically in case of a fault to prevent hazardous conditions like fire, explosion, or carbon monoxide poisoning.
• Diagnostic Lights: The integrated control board features diagnostic lights (red and yellow) that flash specific codes to indicate fault conditions, aiding in troubleshooting.
• Short Cycle Protection: In cooling mode, the system incorporates short cycle protection to prevent rapid cycling of the compressor, which can extend the life of the unit.
• Blower Speed Adjustment: The blower speeds are preset at the factory but can be adjusted by qualified personnel to optimize system performance and comfort, ensuring the required airflow for both heating and cooling.

Maintenance Features

• Air Filter: A suitable air filter system must be installed in the unit or in the return air ductwork upstream of the evaporator coil. Regular inspection and cleaning or replacement of the air filter every three to four weeks are crucial for maintaining efficiency and preventing equipment damage. The unit should never be operated without a filter.
• Vent Cover Assembly: The screen of the vent cover assembly should be inspected and cleaned at the beginning of each heating and cooling season to ensure proper ventilation.
• Condensate Drain and Outdoor Coil: The condensate drain and outdoor coil should be inspected and cleaned at the beginning of each heating and cooling season to remove any debris and ensure proper drainage.
• Electrical Connections: Electrical connections should be inspected for tightness at the beginning of each heating and cooling season.
• Motor Lubrication: The motors for the circulating air blower, outdoor fan, and combustion blower are pre-lubricated at the factory and do not require additional oiling for the life of the product.
• Blower Compartment: The blower compartment, blower, and motor should be cleaned monthly during heating and cooling seasons to remove accumulated dirt and lint, which can cause excessive loads on the motor and shorten its service life.
• Heat Exchanger and Burner Maintenance: The heat exchanger, vent system, and burners should be inspected and cleaned annually by a qualified serviceman to prevent scale buildup, corrosion, and ensure safe operation. Special care must be taken not to damage the ignitor during burner assembly removal and cleaning.
• Gas Piping Leak Check: After installation or any service involving gas piping, all connections must be tested for gas leaks using a soap and water solution or another approved method.
• Refrigerant Charging: The units are factory-charged with refrigerant. If repairs necessitate evacuation and recharging, this must be performed by qualified personnel familiar with safe refrigerant handling procedures.
• Access Panels: The unit features louvered control access panels and blower access panels, which must be securely in place during operation and rigging. These panels provide access for servicing and maintenance.

Nordyne R4GD Series Specifications

General

Series	R4GD
Refrigerant Type	R-410A
Voltage	208/230V
Phase	1
Type	Air Conditioner
Maximum Overcurrent Protection	Varies by model
Minimum Circuit Ampacity	Varies by model
Operating Temperature Range (Cooling)	55°F
Dimensions (Outdoor Unit)	Varies by model
Weight (Outdoor Unit)	Varies by model