Carrier 40QA - User Manual

Installation, Start-Up
and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ................. 1
INSTALLATION ............................1-13
Step 1 − Complete Pre-Installation Checks ...3
• UNPACK UNIT
• INSPECT SHIPMENT
• BEFORE INSTALLATION
Step 2 − Select Location ....................4
Step 3 − Mount Unit ........................6
• TO MOUNT UNIT
• TO INSTALL REMOTE THERMOSTAT
Step 4 − Connect Refrigerant Piping ........7
Step 5 − Connect Condensate Drain Line ...10
Step 6 − Make Electrical Connections ......11
Step 7 − Install Remote Thermostat ........12
Step 8 — Make Connections Between
Indoor and Outdoor Units ................12
• COOLING ONLY SYSTEMS
• HEAT PUMP SYSTEMS
START-UP ...............................13-15
After Extended Shutdown ..................13
Seasonal Changeovers .....................13
Adjusting Airflow ..........................14
Operating Mode Memory ...................14
Automatic Operation (Auto.) Mode ..........14
Operating Sequence .......................14
• FAN OPERATION
• COOLING MODE OPERATION
• HEAT PUMP OPERATION (40QAE ONLY)
• DEFROST (40QAE ONLY)
• SYSTEM SAFETIES
• SPECIAL OPERATION, HEATING
CLEANING AND MAINTENANCE ...........15,16
Lubrication ................................15
To Remove and Clean or Replace
Air Filters ...............................15
• TO REMOVE AIR FILTERS
• TO CLEAN OR REPLACE FILTERS
To Clean Indoor Unit Bottom Panel .........16
To Clean Indoor Coil .......................16
To Clean Outdoor Coil (Outdoor Unit) .......16
To Clean Condensate Drains ................16
• TO CLEAN OR REPLACE DRAIN PAN
SERVICE ..................................16
Before Calling for Service ..................16
• IF SYSTEM FAILS TO OPERATE
FRESH AIR INSTALLATION OPTIONS .......16
Ventilation-Air Accessory ...................16
TROUBLESHOOTING .....................17-20
START-UP CHECKLIST ..............CL-1, CL-2
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install or service air-conditioning equipment.
Untrained personnel can perform basic maintenance, such
as cleaning and replacing filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in lit-
erature and on tags and labels attached to unit.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for brazing operations. Have fire ex-
tinguisher available. Read these instructionsthoroughly. Con-
sult local building codes and National Electrical Code (NEC)
for special installation requirements.
Before installing or servicing system, always turn off
main power to system. There may be more than one dis-
connect switch. Turn off accessory heater power if ap-
plicable. Electrical shock can cause personal injury.
INSTALLATION
The 40QAB ceiling-suspended fan coil unit (Fig. 1) is typi-
cally installed with the 38HDC or 38HDS outdoor condens-
ing unit, and the 40QAE unit is typically installed with the
38QRC heat pump.
NOTE: The 40QAE unit can also be installed with either the
38HDC or HDS condensing units. Refer to Table 1 to make
sure the correct indoor unit(s) is installed with the correct
outdoor unit.
Installation instructions for 40QA fan coil units are con-
tained in this manual. Refer to this manual for proper in-
stallation of the complete system. Note that the outdoor units
are shipped with installation and service instructions for ba-
sic installation of the outdoor section. Be sure to make the
connections in Cooling-Only Systems and Heat Pump Sys-
tems sections on page 12 of this literature so that the unit
will operate properly with the 40QA mircoprocessor control
system.
Fig. 1 — 40QA Ceiling-Suspended Fan Coil Unit
40QA024-060
Ceiling-Suspended Fan Coil Units
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 3d 2d
PC 111 Catalog No. 534-052 Printed in U.S.A. Form 40QA-3SI Pg 1 4-96 Replaces: 40QA-1SI

Summary

Safety Considerations

Installation

Step 1 - Complete Pre-Installation Checks

Review unpacking, inspection, and initial site preparation steps before installing the fan coil unit.

Step 2 Select Location

Guidelines for choosing an appropriate installation location for the indoor unit considering clearances and airflow.

Step 3 Mount Unit

Instructions for physically mounting the indoor fan coil unit using provided brackets and hardware.

Step 4 Connect Refrigerant Piping

Details on connecting refrigerant lines between indoor and outdoor units, including insulation and pipe sizing.

Step 5 Connect Condensate Drain Line

Procedures for connecting the condensate drain line, ensuring proper slope and material use.

Step 6 Make Electrical Connections

Steps for safely making electrical connections to the unit, adhering to codes and voltage requirements.

Step 7 - Install Remote Thermostat

Instructions for installing and wiring the remote thermostat for system control.

Step 8 - Make Connections Between Indoor and Outdoor Units

Finalizing the system by connecting low-voltage wiring between the indoor and outdoor units.

Start-Up

After Extended Shutdown

Procedure for supplying power to the system for 12 hours before starting after a prolonged shutdown.

Seasonal Changeovers

Steps for transitioning the system between cooling and heating modes or preparing for seasonal use.

Cleaning and Maintenance

Lubrication

Information regarding factory lubrication of motors, indicating no additional oiling is required.

To Remove and Clean or Replace Air Filters

Detailed steps for accessing, cleaning, or replacing the air filters in the indoor unit.

Service

Before Calling for Service

Troubleshooting steps to perform before contacting a service technician for system issues.

Troubleshooting

Carrier 40QA Specifications

General

Brand	Carrier
Model	40QA
Category	Fan
Language	English