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Electra DELTA 18ST - User Manual

Electra DELTA 18ST
110 pages
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DELTA 18-21-24
Indoor Units Outdoor Units
DELTA 18
GC 18
DELTA 21
GC 22
DELTA 24
OU7-24
OU7-24Z
Service Manual
SM DELTA 1-E.0 GB
JUNE – 2010
REFRIGERANT
R410A
HEAT PUMP
COOLING ONLY

Questions and Answers

  • J
    Jason VasquezAug 20, 2025
    Why is my Electra DELTA 18ST Air Conditioner not cooling or heating, and only the indoor fan is working?
    • J
      Joseph BrownAug 20, 2025
      If your Electra Air Conditioner isn't cooling or heating, and only the indoor fan is working, the outdoor fan motor may be faulty, or another issue may have caused the compressor overload protection to activate. Try removing any obstructions blocking the outdoor fan. If that doesn't work, the P.C.B. may need replacement.
  • L
    Latasha OrtegaAug 22, 2025
    Why is my Electra DELTA 18ST blowing air but not cooling or heating?
    • T
      Timothy BarberAug 22, 2025
      If your Electra Air Conditioner is not cooling or heating, but the indoor fans are working, it could be due to the overload safety device on the compressor being cut out because of low voltage or high temperature. Check for proper voltage. Switch off the power and try again after one hour. If the problem persists, consider replacing the compressor capacitor or the compressor itself.
  • L
    Leslie TorresAug 25, 2025
    How to troubleshoot an Electra Air Conditioner when the outdoor fan is not working?
    • J
      John PruittAug 25, 2025
      If your Electra Air Conditioner's outdoor fan isn't functioning correctly, check the voltage between the outdoor fan terminals on the main P.C.B. If there's no voltage, replace the main P.C.B. If there is voltage, replace the capacitor or motor. You should also check and repair the electrical wiring between the indoor and outdoor units.
  • J
    Justin BaileyAug 26, 2025
    How to fix Electra Air Conditioner when the indoor fan is not working correctly?
    • J
      Julia LoveAug 26, 2025
      If the indoor fan in your Electra Air Conditioner isn't working correctly, check the voltage between the indoor fan terminals on the main P.C.B. If there is voltage, replace the capacitor or motor.
  • J
    james60Aug 28, 2025
    What to do if the Electra Air Conditioner compressor does not start up?
    • Y
      ycookAug 28, 2025
      If your Electra Air Conditioner compressor isn't starting, begin by checking the voltage on the compressor terminals on the outdoor unit. If there's no voltage, repair the electrical wiring between the indoor and outdoor units. If the voltage is low, repair the power supply. If the voltage is correct, replace the capacitor or the compressor.
  • M
    Martin SloanAug 30, 2025
    Why is my Electra Air Conditioner in heat mode but operating in cooling?
    • D
      Darrell GarzaAug 30, 2025
      If your Electra Air Conditioner is in heat mode but operating in cooling, the RV coil may be faulty, so replace the RV coil. If the RV coil is okay, the valve may be stuck in position, so replace the reversing valve.
  • T
    tracykellerSep 1, 2025
    Why is only the indoor fan and compressor working on my Electra Air Conditioner?
    • B
      Brian TrevinoSep 1, 2025
      If your Electra Air Conditioner only has the indoor fan and compressor working, it's likely that the outdoor fan is blocked. Remove any obstructions to allow it to function correctly.
  • A
    Aaron ParksSep 3, 2025
    Why is there no air supply from the indoor unit of my Electra Air Conditioner, even though the compressor is running?
    • M
      Melanie LongSep 3, 2025
      If your Electra Air Conditioner's indoor fan isn't providing enough air, and the compressor is running, the indoor fan motor might be blocked or turning slowly. Check the voltage and repair the wiring if necessary. Also, check if the fan wheel is tight enough on the motor shaft and tighten it if necessary.
  • P
    pgibsonSep 5, 2025
    Why is only the indoor fan working on my Electra DELTA 18ST Air Conditioner?
    • V
      Vicki WillisSep 5, 2025
      If your Electra Air Conditioner is only running the indoor fan, the run capacitor of the outdoor fan motor may be faulty, so replace the capacitor. Alternatively, the windings of the outdoor fan may be shorted, so replace the motor.
  • X
    xbrownSep 7, 2025
    Why is the operation indicator on my Electra DELTA 18ST Air Conditioner not lighting up?
    • B
      bnorrisSep 7, 2025
      If the operation indicator (green LED) on the central control display panel of your Electra Air Conditioner does not light up, the remote control batteries are discharged. Replace the batteries of the remote control.

Summary

Introduction to Electra DELTA Air Conditioners

General Overview and Model Variants

Overview of DELTA split wall mounted models, cooling only and heat pump variants.

DELTA Series Main Features

Highlights key technological innovations and benefits of the DELTA series.

Indoor Unit Description

Details the wall-mounted indoor unit and its components.

Air Filtration Systems

Lists the various types of air filters available for the DELTA series.

Control System Overview

Mentions the microprocessor controller and infrared remote for unit operation.

Outdoor Unit Specifications

Describes outdoor unit installation, protection, and its included components.

Optional Accessories

Lists optional accessories such as the All Season Kit (ASK) and RCW.

R410 A Matching Table

Table showing compatible indoor and outdoor units for R410A refrigerant.

Product Data Sheet for DELTA Units

DELTA 18; GC 18 R410 A Specifications

Detailed specifications for DELTA 18 indoor and GC 18 outdoor units.

DELTA 21; GC 22 R410 A Specifications

Detailed specifications for DELTA 21 indoor and GC 22 outdoor units.

DELTA 24; OU7-24 R410 A Specifications

Detailed specifications for DELTA 24 indoor and OU7-24 outdoor units.

DELTA 24; OU7-24 Z R410 A Specifications

Detailed specifications for DELTA 24 indoor and OU7-24Z outdoor units.

DELTA 24; OU7-24 T R410 A Specifications

Detailed specifications for DELTA 24 indoor and OU7-24T outdoor units (3-phase).

Rating and Operating Conditions

R410 A Operating Limits

Table detailing operating limits for cooling, heating, and voltage parameters.

Outline Dimensions of DELTA Units

Indoor Unit Dimensions

Provides diagrams and dimensions for the DELTA 18, 21, and 24 indoor units.

Outdoor Unit Dimensions (GC 18, 22)

Displays diagrams and dimensions for the GC 18 and GC 22 outdoor units.

Outdoor Unit Dimensions (OU7-24, OU7-24 Z)

Shows diagrams and dimensions for the OU7-24 and OU7-24Z outdoor units.

Performance Data and Pressure Curves

DELTA18 GC18 R410 A Performance

Contains performance data tables for the DELTA18/GC18 model in cooling mode.

DELTA18 GC18 R410 A Heating Performance

Provides performance data tables for the DELTA18/GC18 model in heating mode.

Capacity Correction Factors by Tubing Length

Details capacity correction factors for cooling and heating based on tubing length.

Pressure Curves (Cooling)

Presents graphs for suction and discharge pressure versus outdoor temperature.

Pressure Curves (Heating)

Displays graphs of suction and discharge pressure versus outdoor temperature for heating.

DELTA21 GC21 R410 A Performance

Contains performance data tables for the DELTA21/GC21 model in cooling mode.

DELTA21 GC21 R410 A Heating Performance

Provides performance data tables for the DELTA21/GC21 model in heating mode.

Pressure Curves (DELTA21 Cooling)

Presents graphs for suction and discharge pressure versus outdoor temperature.

Pressure Curves (DELTA21 Heating)

Displays graphs of suction and discharge pressure versus outdoor temperature for heating.

DELTA24;OU7 Series Performance

Contains performance data tables for DELTA24 models in cooling mode.

DELTA24;OU7 Series Heating Performance

Provides performance data tables for DELTA24 models in heating mode.

Pressure Curves (DELTA24 Cooling)

Presents graphs for suction and discharge pressure versus outdoor temperature.

Pressure Curves (DELTA24 Heating)

Displays graphs of suction and discharge pressure versus outdoor temperature for heating.

Sound Level Characteristics

Sound Pressure Level Introduction

Introduction to sound pressure level measurements and their significance.

Indoor Unit Sound Spectrum

Sound pressure level spectrum data for indoor units.

Outdoor Unit Sound Characteristics

Introduction to sound level characteristics of the outdoor units.

Outdoor Unit Sound Spectrum

Sound pressure level spectrum data for GC 18, GC 22, OU7-24Z, OU7-24 units.

Electrical Data

Single Phase Unit Electrical Data

Provides electrical data for single-phase indoor and outdoor units.

Wiring Diagrams

Indoor Unit Wiring Diagram

Wiring diagram for the DELTA 18, 21, and 24 indoor units.

Outdoor Unit Wiring Diagrams

Wiring diagrams for GC 18, GC 24, OU7-24, OU7-24Z, OU7-24 3PH outdoor units.

Electrical Connections

DELTA 18; 21 1 PH Connections

Electrical connection diagrams for DELTA 18 and 21 1PH units.

DELTA 24 1 PH Connections

Electrical connection diagrams for DELTA 24 1PH units.

Refrigeration Diagrams

Heat Pump Model Refrigeration Diagrams

Refrigeration diagrams for heat pump models.

Cooling Only Model Refrigeration Diagrams

Refrigeration diagrams for cooling only models.

Tubing Connections Guide

Tube Bending and Torque Specifications

Information on tube bending radius and torque specifications for flare nuts.

Control System Operations

Electronic Control Basics

Overview of electronic control, including jumpers and legend.

General Functions and Operating Modes

Details COMP, IFAN, HE operations, modes (Cooling, Heating, Dry, Auto), and protections.

Timer and Sleep Mode Functions

Explains timer functions and sleep mode adjustments for user comfort.

Self-Test, Indicators, and Diagnostics

Covers self-test procedures, indicator functions, and system diagnostics.

Troubleshooting Guide

Common Symptoms and Corrective Actions

Lists common symptoms, probable causes, and corrective actions for unit issues.

Exploded Views and Spare Parts

Indoor Unit Exploded View and Parts List

Exploded view and parts list for DELTA indoor units.

Outdoor Unit GC 18 ST Exploded View and Parts

Exploded view and parts list for GC 18 ST outdoor unit.

Outdoor Unit GC 18 RC Exploded View and Parts

Exploded view and parts list for GC 18 RC outdoor unit.

Outdoor Unit GC 21 RC Exploded View and Parts

Exploded view and parts list for GC 21 RC outdoor unit.

Outdoor Unit GC 24 RC Exploded View and Parts

Exploded view and parts list for GC 24 RC outdoor unit.

Outdoor Unit OU7-24 RC 1 PH Exploded View and Parts

Exploded view and parts list for OU7-24 RC 1PH outdoor unit.

Optional Accessories Guide

RCW Wall Mounted Remote Control

Details the features and application of the RCW wall-mounted remote control.

RCW2 Wired Remote Controller

Describes the RCW2 wired controller for managing multiple units and zones.

ASK (All Season Kit) Installation

Explains the A.S.K for enabling cooling operation at low ambient temperatures.

Appendix A: Installation Manual Reference

Installation and Operation Manual for DELTA Units

Reference to the separate installation and operation manual for DELTA units.

Electra DELTA 18ST Specifications

General IconGeneral
BrandElectra
ModelDELTA 18ST
CategoryAir Conditioner
LanguageEnglish

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