Aqua Comfort AC1500 User Manual

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1

OWNER’S MANUAL

Vintage Signature Series models: AC750, AC1050, AC1100, AC1250, AC1500, AC1750

Manufacturing High Quality, High Efficiency

Heat Pump Pool Heaters

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2

INSPECTION 2

GENERAL INFORMATION 2

INSTALLATION 2

WATER FLOW & CONNECTIONS 2-3

ELECTRICAL CONNECTIONS 4

MODES OF OPERATION 5

WIRING DIAGRAMS 6

ELECTRONIC CONTROL PANEL 7

CHEMICAL USE 8

START-UP 9-10

MAINTENANCE 10

TROUBLESHOOTING CHECKLIST 11

CALLING FOR SERVICE 12

WARRANTY 13

WARRANTY REGISTRATION 14

Proudly Made in the USA

support@aquacomfort.com

888

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475

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7443

ALL IN-GROUND

MODELS

INSTALLATION,

OPERATION,

MAINTENANCE

& SERVICE

Table of Contents

Questions and Answers:

A
April BrockAug 14, 2025
What to do if the Internal Flow Switch is Open on my Aqua Comfort AC1500?
- M
  Matthew JonesAug 14, 2025
  If the internal flow switch on your Aqua Comfort Swimming Pool Heater is open, it could be due to several reasons. First, check that the pump is running and ensure there's sufficient water supply, looking for any air leaks. The filter might be dirty or clogged, so clean or replace it. Make sure that valves are correctly positioned and that the filter is not in backwash mode. An undersized pump can also cause this issue, so consider replacing it with an appropriately sized pump. Finally, the water pressure switch might need adjustment or replacement.
J
jrogersAug 17, 2025
Why is the Low Pressure Switch Open on my Aqua Comfort AC1500?
- B
  Brian CraigAug 18, 2025
  If the low-pressure switch is open on your Aqua Comfort Swimming Pool Heater, several factors could be the cause. The evaporator coil might be dirty, so cleaning it is a good first step. Check if the fan motor is running; if not, repair or replace it. Low refrigerant pressure can also trigger this issue, so check the refrigerant levels and recharge if necessary. Finally, the low-pressure switch itself might be defective and require replacement.
J
Jamie RobertsAug 21, 2025
What causes the High Pressure Switch to Open on an Aqua Comfort Swimming Pool Heater?
- M
  Melissa WhiteAug 21, 2025
  If the high-pressure switch is open on your Aqua Comfort Swimming Pool Heater, it could be due to low water flow to the heater. Make sure that there is adequate water flow. Alternatively, the high-pressure switch itself may be defective and need replacement.
T
tammyandersenAug 25, 2025
How to fix a Water Thermistor Open error on Aqua Comfort Swimming Pool Heater?
- T
  Terri RamirezAug 25, 2025
  If you're getting a 'Water Thermistor Open' error on your Aqua Comfort Swimming Pool Heater, it could be due to a loose sensor wire, so ensure that it is secure. If the wire is secure, the water thermistor itself might be defective and need replacement.
D
Destiny McculloughAug 29, 2025
What should I do if the Water Thermistor is Closed on my Aqua Comfort AC1500 Swimming Pool Heater?
- T
  Terry StaffordAug 29, 2025
  If the water thermistor is closed on your Aqua Comfort Swimming Pool Heater, it could be because the wire terminals are touching; try separating them. If that doesn't resolve the issue, the water thermistor itself might be defective and need replacement.
R
rbarkerSep 1, 2025
What does it mean when the Defrost Sensor is Open on an Aqua Comfort Swimming Pool Heater?
- B
  bchristensenSep 1, 2025
  If the defrost sensor is open on your Aqua Comfort Swimming Pool Heater, it could indicate a loose sensor wire. Make sure the wire is secure. If the wire is properly connected, the defrost sensor itself may be defective and require replacement.
B
berryjerrySep 5, 2025
Why is my Aqua Comfort AC1500 Swimming Pool Heater showing a Defrost Sensor Closed error?
- N
  Nicole BartonSep 5, 2025
  If your Aqua Comfort Swimming Pool Heater shows a 'Defrost Sensor Closed' error, it might be because the wire terminals are touching. Separate the terminals and see if that resolves the issue. If not, the defrost sensor itself may be defective and require replacement.
K
Kevin RoseSep 9, 2025
What to do if the Control Voltage is Below 18VAC on my Aqua Comfort AC1500?
- B
  Brian ReillySep 9, 2025
  If the control voltage is below 18VAC on your Aqua Comfort Swimming Pool Heater, check the supply voltage to the unit.

Aqua Comfort AC1500 Specifications

General

Brand	Aqua Comfort
Model	AC1500
Category	Swimming Pool Heater
Language	English

Summary

Safety Considerations

Installation

Electrical Connections

Wiring Main Power Supply

Steps for connecting the main power to the heater unit safely and correctly.

Modes of Operation

Electronic Control Panel

Temperature Setpoint Adjustment

Pool/Spa Mode Selection

Chemical Use

Start-Up Procedures

Initial Heating Process Guide

Factors and steps affecting the initial heating time of the pool water.

Maintenance Guidelines

Heater Protection and Cleaning

Essential maintenance for protecting the heater and ensuring airflow.

Winterizing the Pool Heater

Troubleshooting Checklist

Calling for Service

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