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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

Table of Contents

Questions and Answers

  • M
    Mark DavisSep 9, 2025
    What causes freeze-up of outdoor coil in heating mode in Electra DELTA 18ST?
    • S
      Sara CruzSep 9, 2025
      If your Electra Air Conditioner has freeze-up of outdoor coil in heating mode, poor heating effect in room, and the indoor fan operates, it could be due to a faulty outdoor thermistor, so replace the thermistor. Another cause may be a faulty control cable, so repair the control cable. If the outdoor temperature is below design conditions, shut the unit off, as it cannot work properly. Finally, the outdoor unit air outlet may be blocked, so remove any obstructions.
  • C
    Caitlyn VelazquezSep 12, 2025
    Why doesn't the stand-by indicator light up on my Electra DELTA 18ST Air Conditioner?
    • J
      johnsonshaunSep 12, 2025
      If the stand-by indicator (red LED) on the central control display panel of your Electra Air Conditioner doesn’t light up, there is no correct voltage between the line and neutral terminals on main P.C.B. If the voltage is low, repair the power supply. If there is no voltage, repair general wiring. If there is correct voltage, replace main or display P.C.B’S.
  • P
    Patricia BrownSep 13, 2025
    What to do if the operation indicator does not light up when starting Electra Air Conditioner?
    • T
      Thomas BridgesSep 13, 2025
      If the operation indicator (green led) on your Electra Air Conditioner does not light up when starting from the unit, check the main P.C.B and display P.C.B, and replace the P.C.B if necessary.
  • A
    Alan PetersonSep 15, 2025
    What to do if water accumulates and overflows from Electra DELTA 18ST indoor unit?
    • S
      sanchezrhondaSep 15, 2025
      If your Electra Air Conditioner has water accumulating and overflowing from the indoor unit section, the drain tube or spout of the drain pan is likely clogged. Disassemble the plastic drain tube from the spout of the indoor unit drain pan.
  • M
    Melissa HowardSep 17, 2025
    What to do if Electra DELTA 18ST Air Conditioner refrigeration system does not function correctly?
    • S
      Sarah MeyerSep 17, 2025
      If your Electra Air Conditioner's refrigeration system isn't functioning correctly, check for leaks or restrictions. Repair the refrigeration system and charge refrigerant if necessary.

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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