Installation, Start-Up
and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . 1
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Step 1
−
Complete Pre-Installation Checks
. . . . 2
• UNPACK UNIT
• INSPECT SHIPMENT
Step 2
−
Select Location
. . . . . . . . . . . . . . . . . . . . . 2
Step 3
−
Mount Mounting Bracket on Wall
. . . . 4
Step 4
−
Connect Refrigerant Piping
. . . . . . . . . 5
Step 5
−
Connect Condensate Drain Line
. . . . . 7
Step 6
−
Make Electrical Connections
. . . . . . . . 7
Step 7
−
Make Connections to Outdoor Unit
. . 9
• COOLING-ONLY SYSTEMS
• HEAT PUMP SYSTEMS
Step 8
−
Install Fan Coil Unit Onto Mounting
Bracket
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12
40QN Control System
. . . . . . . . . . . . . . . . . . . . . . . 10
After Extended Shutdowns
. . . . . . . . . . . . . . . . . . 10
Seasonal Changeovers
. . . . . . . . . . . . . . . . . . . . . . 10
To Turn The Unit On and Off
. . . . . . . . . . . . . . . . . 10
Adjusting Airflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating Mode Memory
. . . . . . . . . . . . . . . . . . . . 10
Automatic Operation (Auto) Mode
. . . . . . . . . . . . 11
Operating Fault Diagnosis
. . . . . . . . . . . . . . . . . . . 11
Microprocessor Control Operation
. . . . . . . . . . . 11
CLEANING AND MAINTENANCE
. . . . . . . . . . . . 12-14
Lubrication
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
To Install or Replace Remote Controller
Batteries
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
To Set the Current Time
. . . . . . . . . . . . . . . . . . . . . 13
To Remove and Clean or Replace Air Filters
. . 13
• TO REMOVE AIR FILTERS
• TO CLEAN OR REPLACE FILTERS
To Clean Indoor Unit Front Panel
. . . . . . . . . . . . 13
To Clean Indoor Coil
. . . . . . . . . . . . . . . . . . . . . . . . 13
To Clean Outdoor Coil (Outdoor Unit)
. . . . . . . . 14
To Clean Condensate Drains
. . . . . . . . . . . . . . . . . 14
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15
Diagnostic Codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
System Tests
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
• THERMISTOR TESTS
• COMPRESSOR FAILURE
• REVERSING VALVE FAILURE (38BK Only)
System Safeties and Interlocks
. . . . . . . . . . . . . . 15
• INDOOR FAN FAILURE
• COMPRESSOR SHORT-CYCLING PROTECTION
• INDOOR COIL FREEZE PROTECTION (Cooling or
Dehumidification Mode Only)
• INDOOR COIL HIGH-TEMPERATURE
PROTECTION (Heat Pump Systems Only)
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . 15-18
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . CL-1
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 instructions
thoroughly.
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 indoor fan coil power if ap-
plicable. Electrical shock can cause personal injury.
GENERAL
The new Carrier 40QNE heat pump high wall fan coil units
(Fig. 1) DO NOT have electric heaters. These new heat pump
fan coil units have been specifically designed to improve sys-
tem efficiency in both heating and cooling modes when matched
with a 38BK outdoor heat pump unit. If your application
requires heating, heat pump units must be used, both out-
doors and indoors. See Table 1 for recommended system
combinations.
Fig. 1 — 40QN High Wall Fan Coil Unit
40QNB/QNE
018,024
High Wall 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
3e 2f
PC 111
Catalog No. 534-078
Printed in U.S.A.
Form 40QN-1SI
Pg 1
4-96
Replaces: New
