Table of Contents
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CONTENTS
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THERMISTORS
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PROTECTION (Heat Pump Systems Only)
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 111
Tab
3e 2f
Installation, Start-Up
and Service Instructions
Page
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Catalog No. 534-003
Printed in U.S.A.
High Wall Fan Coil Units
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 Carrier 40QNH heat pump high wall fan coil units
(Fig. 1) come with supplemental electric heat. If your ap-
plication requires heating, heat pump units must be used, both
outdoors and indoors. See Table 1 for recommended system
combinations.
Fig. 1 - Typical 40QNH High Wall Fan Coil Unit
Form 40QN-4SI
Pg 1
40QNB,QNH
018,024
5-99
Replaces: 40QN-1SI
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Summary of Contents for Carrier 40QNB
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Page 1: Table Of Contents
..... 15 Operating Fault Diagnosis The Carrier 40QNH heat pump high wall fan coil units ....15 Microprocessor Control Operation (Fig. -
Page 2: Installation
INSTALLATION BK) or winter start kit (HDS) that will allow operation down to −20 F. The 40QNB high wall fan coil unit is installed with either the 38HDC,HDL condensing or 38HDS multi-split condens- Check all items. See Table 3. If any item is missing notify ing outdoor unit, and the 40QNH unit is installed with the your Carrier distributor. - Page 3 UNIT WEIGHT 40QN 39 Lb (17.5 Kg) 43 Lb (19.5 Kg) 1. Dimensions in ( ) are in millimeters. Direction of airflow. 3. Refrigerant, drain, and power connections may be made in unit rear, bottom, left side, or right side. 4.
- Page 4 Table 3 — High Wall Unit Package Contents ITEM QUANTITY Unit Mounting Template Unit Mounting Bracket 1-in. Lag Screws For Unit Mounting Hollow Wall Anchor Bolts For Unit Mounting Wall Sleeve With Wall Cap Infrared Wireless Remote Control Assembly AAA Batteries (For Remote Control) Remote Control Mounting Bracket ⁄...
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Page 5: Step 3 - Mount Mounting Bracket On Wall
For the 38HDS024 unit, the maximum pipe length is 50 ft. The 40QNB,QNH unit is shipped with a factory hold- ing charge of R-22. DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT PIPE IN THE GROUND. - Page 6 Fig. 6 — Bracket Mounting d. Install factory-supplied flare connection and Accu- Rater metering device in liquid line at the fan coil unit on 38HDC, HDL and 38BK systems (Fig. 9). Make sure the arrow on the metering device body points AWAY FROM the fan coil unit.
- Page 7 Table 4A — Physical Data — 38HDC Condensing Units UNIT 38HDC NOMINAL CAPACITY (Tons) ⁄ OPERATING WEIGHT (lb) REFRIGERANT TYPE R-22 Control (Cooling) AccuRater Piston at Fan Coil Unit Factory Charge (lb) COMPRESSOR TYPE Tecumseh Reciprocating Copeland Scroll Model AW5517G ZR23K1 Oil (Recharge) (oz) Crankcase Heater (Watts)
- Page 8 *Charge is based on 25 ft of interconnecting line. LEGEND †Maximum system lift is 30 ft between lowest system component and highest system component. TXV — Thermostatic Expansion Valve Table 4D — Physical Data — 40QNB High Wall Fan Coil Units UNIT 40QNB 018* 024* NOMINAL CAPACITY (Tons) ⁄...
- Page 9 Table 4E — Physical Data — 38BK018, 024 Outdoor Heat Pump Units UNIT 38BK018* 38BK024* NOMINAL CAPACITY (Tons) ⁄ OPERATING WEIGHT (lb) REFRIGERANT TYPE R-22 Control (Cooling) AccuRater Piston at Fan Coil Unit Control (Heating) AccuRater Piston at Outdoor Unit Factory Charge (lb)†...
- Page 10 Table 4F — Physical Data — 40QNH High Wall Fan Coil Units UNIT 40QNH NOMINAL CAPACITY (Tons) ⁄ NOMINAL SIZE (Btuh) 18,000 24,000 OPERATING WEIGHT (lb) 38.5 42.9 MOISTURE REMOVAL RATE (Pints/Hr) FINISH White REFRIGERANT R-22 Control (Cooling) AccuRater Piston in Fan Coil Control (Heating) AccuRater Piston in Outdoor Unit Charge Required (lb)
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Page 11: Step 5 - Connect Condensate Drain Line
Step 5 — Connect Condensate Drain Line — Observe all local sanitary codes when installing condensate drains. 1. Connect drain line by inserting a ⁄ -in. rigid PVC pipe over the drain connection. Refer to Fig. 11. NOTE: Arrow on AccuRater body points in free flow direction away from the coil. -
Page 12: Step 6 − Make Electrical Connections
2. Remove control box strain relief clamp (see Fig. 13). Step 6 — Make Electrical Connections — Be sure field wiring complies with local building codes and NEC, 3. Remove any factory test leads still connected to the power and unit voltage is within limits shown in Table 6. Refer to terminal box. -
Page 13: Step 7 − Make Connections To Outdoor Unit
Fig. 12 — Drainage System (Rear Piping Shown) Step 7 — Make Connections to the Outdoor Unit COOLING-ONLY SYSTEMS — To connect the 38HDC, HDL or HDS condensing unit to the fan coil unit(s) so that the system will operate correctly: Route 2 field-supplied wires of 18-gage AWG (American Wire Gage) thermostat cable between the low-voltage ter- minal block of the fan coil unit (TB2) and the 38HDC, HDL... -
Page 14: Start-Up
Fig. 16 — Mounting Unit to Bracket indoor coil. The 40QNH heat pump fan coil units also have START-UP thermistors located on the outdoor coil and in the outdoor air Complete the following checks and the Start-Up Check- inlet. These thermistors monitor system operation and con- list on page CL-1 before system start-up. -
Page 15: After Extended Shutdowns
After Extended Shutdowns — If the system has been turned off for more than 12 hours, turn on the indoor and outdoor unit disconnect switches to supply power to the sys- tem for 12 hours BEFORE starting the system. Seasonal Changeovers — When changing heat pump system from cooling to heating or heating to cooling, or be- fore starting cooling only system after it has been out of use... - Page 16 • Cooling Mode — When the Cooling mode is selected, the 3. When the room temperature is equal to or greater than indoor fan will operate continuously at the selected speed 4° F below the selected temperature, the system operates if the speed is high, medium, or low.
- Page 17 DEFROST REGION THREE (NO DEFROST OPERATION) ADJUSTS IF LONG DEFROST CYCLE DEFROST REGION TWO (MORE THAN (MINIMUM UNIT RUNTIME 6 MINUTES) = 6 HOURS*) ADJUSTS IF SHORT DEFROST CYCLE (LESS THAN 3 MINUTES) DEFROST REGION ONE (MINIMUM UNIT RUN TIME = 50 MIN.*) OUTDOOR AIR TEMPERATURE (F) *A defrost will be initiated after 30 minutes of compressor run time if the outdoor...
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Page 18: Cleaning And Maintenance
If you suspect this is the problem, consult your CLEANING AND MAINTENANCE Carrier distributor. Batteries should be replaced once a year. Use 2 batteries (1.5 v, dc-type, AAA alkaline batteries). Never use old or To avoid the possibility of electric shock, before per- recharged batteries together with new ones. -
Page 19: To Set The Current Time
If the filter has begun to break down or is torn, it needs to be replaced. Replacement filters are available through your Carrier distributor. PRESS SET TIME PRESS Fig. 23 — Setting The Current Time... -
Page 20: Service
Table 9 — System Fault Codes SERVICE NO. OF QUICK SYSTEM FAULT LED FLASHES Room Air Thermistor When servicing unit, turn off all electric power to unit Indoor Coil Thermistor to avoid shock hazard or injury from rotating parts. Outdoor Coil Thermistor* Compressor Malfunction Reversing Valve Malfunction* Outdoor Air Thermistor*... - Page 21 Table 10 — 40QN Thermistor Properties* MINIMUM NOMINAL MAXIMUM TEMP MINIMUM NOMINAL MAXIMUM THERMISTOR THERMISTOR THERMISTOR OHMS OHMS OHMS VOLTS — DC VOLTS — DC VOLTS — DC −40 303,300 342,700 386,200 4.80 4.82 4.84 −30 211,500 237,276 265,444 4.72 4.75 4.77 −20...
- Page 22 LEGEND NOTES: 1. All piping must follow standard refrigerant piping techniques. Refer to Carrier NEC — National Electrical Code System Design Manual. Piping 2. All wiring must comply with the applicable local and national codes. Line Voltage 3. Liquid line need not be insulated.
- Page 23 LEGEND AND NOTES FOR FIG. 26-28 AGING — For the Burn-In Test (short these terminals) — Outdoor-Fan Relay AS, ASS’Y — Assembly — Overload — Contactor — Printed Circuit Board — Capacitor — Start Thermistor — Crankcase Heater RA Th — Return Air Thermistor —...
- Page 24 40QNH018, 024 FAN COIL 38BK018, 024 OUTDOOR SECTION Fig. 26 — 40QNH Fan Coil Unit with 38BK Outdoor Heat Pump Unit...
- Page 25 40QNB018, 024 FAN COIL 38HDC018, 024 OUTDOOR SECTION *38HDC018 ONLY. Fig. 27 — 40QNB Fan Coil Unit with 38HDC Cooling Only Outdoor Condensing Unit...
- Page 26 40QNB018, 024 FAN COIL 38HDL018, 024 OUTDOOR SECTION Fig. 28 — 40QNB Fan Coil Unit with 38HDL Cooling Only Outdoor Condensing Unit...
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Page 27: Start-Up Checklist
†FIELD PIPING AND ALL TUBING CONNECTIONS MUST BE LEAK TESTED BY THE PRESSURE METHOD DE- SCRIBED IN CARRIER GENERAL TRAINING FOR AIR CONDITIONING MANUAL (GTAC2), MODULE 5. USE R-22 AT APPROXIMATELY 25 PSIG BACKED UP WITH AN INERT GAS TO REACH A TOTAL SYSTEM PRESSURE NOT TO EXCEED 245 PSIG. - Page 28 MEASURE AND RECORD THE: VAPOR LINE PRESSURE: PSIG DISCHARGE PRESSURE: PSIG Copyright 1999 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 111 Catalog No. 534-003 Printed in U.S.A.
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