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Carrier AQUAZONE 50QE900 - User Manual

Carrier AQUAZONE 50QE900
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500037-01 Printed in U.S.A. Form 50QE-7SI Pg 1 7-07 Replaces: 50QE-2SI
Book 1 4
Ta b 5 a 5a
Installation and Operating Instructions
Part Number 50QE900-220WS
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Select Thermostat Location . . . . . . . . . . . . . . . . . . . . . . 1
Install Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Set Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Heat Pump Configuration . . . . . . . . . . . . . . . . . . . . . . . . 3
Configure Advanced Setup. . . . . . . . . . . . . . . . . . . . . . . 3
Program Thermostat Schedules. . . . . . . . . . . . . . . . . . 4
Calibrate Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Check Thermostat Operation. . . . . . . . . . . . . . . . . . . . . 6
Final Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Two-Stage Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Fol-
low all local electrical codes during installation. All wiring
must conform to local and national electrical codes. Improper
wiring or installation may damage thermostat.
Recognize safety information. This is the safety alert sym-
bol . When the safety alert symbol is present on equipment
or in the instruction manual, be alert to the potential for person-
al 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 a haz-
ard which could result in personal injury or death. CAUTION
is used to identify unsafe practices which would result in minor
personal injury or property damage.
GENERAL
The 7-day, commercial, programmable thermostats is a
wall-mounted, low-voltage thermostat which maintains room
temperature by controlling the operation of an HVAC (heating,
cooling and ventilation) system. Separate heating and cooling
set points and auto-changeover capability allow occupied and
unoccupied programming for energy savings.
This thermostat allows up to 4 time/temperature settings to
be programmed per 24-hour period. Each thermostat stores
programs for 7 independent days. Batteries are not required.
During power interruption the internal NEVERLOST™ mem-
ory stores programmed schedules for an unlimited time while
the clock continues to run for at least 48 hours.
The thermostat can be configured to accept several different
equipment configurations, and is provided for heat pump
operation.
INSTALLATION
Select Thermostat Location —
The thermostat should
be mounted:
• approximately 5 ft from the floor
• close to or in a frequently used room, preferably on an
inside partitioning wall
• on a section of wall without pipes or ductwork
• where temperature operating limits are within 41 to
104 F (5 to 40 C)
• where humidity operating range is within 0 to 95% rela-
tive humidity, non-condensing
The thermostat should NOT be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• where exposed to direct light and heat from a lamp, the
sun, a fireplace, or any other temperature-radiating
object which may cause a false reading
• close to or in direct airflow from supply registers or
return-air grilles
• in areas with poor air circulation (such as behind a door
or in an alcove)
IMPORTANT: Read entire instructions before starting
the installation.
AQUAZONE™
50QE900 Water Source Heat Pump
Commercial Programmable Thermostat

Table of Contents

Other manuals for Carrier AQUAZONE 50QE900

Preview: Owner's Manual
Owner's Manual8 pages

Questions and Answers

  • L
    lanelisaAug 15, 2025
    How to fix the display on Carrier AQUAZONE 50QE900 if it is not illuminated?
    • M
      mendozarileyAug 15, 2025
      If the display on your Carrier Thermostat is not illuminated, check for 24 vac at the R terminal connection. The R terminal must be connected for the thermostat to operate correctly.
  • W
    William ThomasAug 18, 2025
    How to fix a Carrier AQUAZONE 50QE900 with no display?
    • J
      James AndersonAug 18, 2025
      If the display on your Carrier Thermostat is not illuminated, check for 24 VAC at the R terminal connection. The R terminal must be connected for the thermostat to operate correctly.
  • A
    andrew66Aug 21, 2025
    How to fix a Carrier AQUAZONE 50QE900 with a blank display?
    • R
      Raymond MilesAug 22, 2025
      If the display on your Carrier Thermostat is not illuminated, check for 24 VAC at the R terminal connection. The R terminal must be connected for the thermostat to operate correctly.
  • J
    joseph15Aug 25, 2025
    What to do if cooling will not energize on Carrier AQUAZONE 50QE900 Thermostat?
    • R
      Rachel JohnsonAug 26, 2025
      To troubleshoot why your Carrier Thermostat isn't activating cooling, first ensure it is in COOL mode. Then, lower the cooling set point 10 degrees below the current room temperature. Check for 24 vac at the Y1 terminal. If voltage is present, the thermostat is working, and the problem lies with the wiring or equipment. If there's no voltage, replace the thermostat. Also, examine the Compressor Cycle per Hour Limit.
  • N
    Nicholas RayAug 28, 2025
    What to do if heating will not energize on Carrier Thermostat?
    • M
      Megan WilliamsAug 28, 2025
      To troubleshoot why your Carrier Thermostat isn't activating heat, first ensure it is in HEAT mode. Then, raise the heating set point 10 degrees above the current room temperature. Check for 24 vac at the W1/O/B terminal. If voltage is present, the thermostat is working, and the problem lies with the wiring or equipment. If there's no voltage, replace the thermostat.
  • A
    Amber DixonAug 31, 2025
    What to do if cooling will not energize on my Carrier AQUAZONE 50QE900?
    • T
      thomasjuarezAug 31, 2025
      If the cooling function on your Carrier Thermostat is not working, make sure you have selected COOL mode and that the cooling set point is at least 10 degrees below the current room temperature. Check for 24 VAC at the Y1 terminal. If voltage is present, the thermostat is likely working correctly, and the issue lies with the wiring or equipment. If there is no 24 VAC, consider replacing the thermostat. Also, check the Compressor Cycle per Hour Limit, as cooling may be locked out.
  • D
    Dominique HillSep 4, 2025
    What to do if heating will not energize on my Carrier AQUAZONE 50QE900?
    • N
      Noah DunnSep 4, 2025
      If the heating function on your Carrier Thermostat is not working, ensure that you have selected HEAT mode and that the heating set point is at least 10 degrees above the current room temperature. Check for 24 VAC at the W1/O/B terminal. If voltage is present, the thermostat is likely operating correctly, and the issue lies with the wiring or equipment. If 24 VAC is absent, you may need to replace the thermostat.
  • J
    Jacob RobbinsSep 7, 2025
    Why does my Carrier AQUAZONE 50QE900 Thermostat display 'Service Filter'?
    • Z
      Zachary GarciaSep 7, 2025
      The 'Service Filter' message appears on your Carrier Thermostat after a set number of blower operating hours. This is a reminder to replace the filter. To clear the message and reset the blower operation timer to 0 hours, reset the Service Filter feature.
  • M
    matthewmcdonaldSep 12, 2025
    How to stop heat from coming on during cooling cycle on Carrier AQUAZONE 50QE900?
    • M
      Martin ElliottSep 12, 2025
      If you are experiencing heat coming on during the cooling cycle when controlling a heat pump with your Carrier Thermostat, you need to configure the thermostat for heat pump operation. Refer to Table 2, Step 3 for instructions.

Summary

General Information and System Overview

Installation Procedures

Select Thermostat Location

Guidance on choosing the optimal mounting location for the thermostat, considering environmental factors.

Install Thermostat

Detailed steps for physically mounting the thermostat and connecting its wiring to the system.

Set Clock and Date

Instructions for setting the current time and day on the thermostat for accurate scheduling.

Heat Pump Configuration

Configuration steps for heat pump operation, focusing on reversing valve polarity settings.

Configure Advanced Setup

Procedure to access and modify advanced system settings through a step-by-step menu.

Deadband Settings

Defines the temperature differential required to activate heating or cooling stages.

Setpoint Minimum Difference

Sets the minimum allowable temperature gap between heating and cooling set points.

Cycles Per Hour Limit

Configures the maximum number of system cycles per hour to protect compressor longevity.

Temperature Units

Selects the display and operational temperature scale: Fahrenheit or Celsius.

Security Level Configuration

Sets access restrictions, limiting user adjustments to set points and programming.

Program Thermostat Schedules

Guide to creating and inputting daily temperature schedules for occupied and unoccupied periods.

Calibrate Sensor

Procedure to re-calibrate the thermostat's temperature sensor for accurate readings.

Thermostat Operation and Features

Check Thermostat Operation

Steps to verify correct heating, cooling, and fan functionality after installation.

Final Installation Checklist

Final steps after installation, including tidying up, reviewing with the owner, and leaving manuals.

Auto-Changeover Function

Explanation of the thermostat's automatic switching between heating and cooling modes.

Two-Stage Operation Explained

Details on when the second stage of heating or cooling is activated.

Clock Backup Functionality

Information on how the thermostat maintains time during power interruptions.

Fan Operation Modes

Describes continuous fan operation versus fan operation only during heating/cooling cycles.

Emergency Heat Activation

Instructions for activating the emergency heat mode for heat pump systems.

Holiday Mode Configuration

How to set the thermostat to use unoccupied set points for a specified duration.

Keypad Lock Feature

Instructions for locking and unlocking the thermostat keypad to prevent unauthorized access.

Troubleshooting Common Issues

Display Not Illuminated Troubleshooting

Diagnosing why the thermostat display is not illuminated, checking power supply.

Service Filter Display Troubleshooting

Addressing the 'Service Filter' message and how to reset the filter replacement reminder.

Cooling Not Energizing Troubleshooting

Steps to resolve issues where the cooling system does not activate, checking wiring and settings.

Heating Not Energizing Troubleshooting

Steps to resolve issues where the heating system does not activate, checking wiring and settings.

Carrier AQUAZONE 50QE900 Specifications

General IconGeneral
BrandCarrier
ModelAQUAZONE 50QE900
CategoryThermostat
LanguageEnglish

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