High Wall Fan Coil Units
Installation, Start-Up
and Service Instructions
40QNB,QNH
018,024
CONTENTS
Page
SAFETY CONSIDERATIONS
GENERAL ....................................1,2
INSTALLATION ..............................2-14
Step 1 − Complete Pre-Installation Checks .......2
• UNPACK UNIT
• INSPECT SHIPMENT
Step 2 − Select Location
Step 3 − Mount Mounting Bracket on Wall ........5
Step 4 − Connect Refrigerant Piping .............5
Step 5 − Connect Condensate Drain Line ........11
Step 6 − Make Electrical Connections ...........12
Step 7 − Make Connections to Outdoor Unit .....13
• COOLING-ONLY SYSTEMS
• HEAT PUMP SYSTEMS
Step 8 − Install Fan Coil Unit Onto Mounting
Bracket
START-UP .................................14-17
40QN Control System .........................14
After Extended Shutdowns .....................15
Seasonal Changeovers ........................15
To Turn The Unit On and Off ...................15
Adjusting Airflow .............................15
Operating Mode Memory .......................15
Automatic Operation (Auto) Mode ...............15
Operating Fault Diagnosis .....................15
Microprocessor Control Operation ..............15
CLEANING AND MAINTENANCE ...............18,19
Lubrication ..................................18
To Install or Replace Remote Controller
Batteries ...................................18
To Set the Current Time .......................19
To Remove and Clean or Replace Air Filters ......19
....................................13
• TO REMOVE AIR FILTERS
• TO CLEAN OR REPLACE FILTERS
To Clean Indoor Unit Front Panel
To Clean Indoor Coil ..........................19
To Clean Outdoor Coil (Outdoor Unit) ...........19
Cleaning Condensate Drains ...................19
SERVICE ....................................20
Diagnostic Codes .............................20
System Tests ................................20
• THERMISTOR TESTS
• THERMISTORS
• COMPRESSOR FAILURE
• REVERSING VALVE FAILURE (38BK Only)
System Safeties and Interlocks
• 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
START-UP CHECKLIST ..................CL-1,CL-2
.....................1
.......................2
...............19
.................20
........................20-26
SAFETY CONSIDERATIONS
Installing andservicing air-conditioning equipment can be
hazardous due to system pressure and electrical components. 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 literature and on tags and labels attached to unit.
Follow all safety codes. Wearsafetyglasses and work gloves.
Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly .Consult 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 disconnect switch. Turn off indoor fan coil power if applicable. 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 application 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
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. 534-003 Printed in U.S.A. Form 40QN-4SI Pg 1 5-99 Replaces: 40QN-1SI
Table 1 — System Combinations for Indoor
and Outdoor Units
SYSTEM INDOOR UNIT OUTDOOR UNIT
40QNB018 38HDC,L018
High Wall
Cooling
Only
High Wall
Heat Pump
*Multi-split systems can accommodate up to 4 fan coil units of vari-
ous types with one condensing unit. The combinations listed in
this table are those which use only high-wall units (not in combination with any other type of fan coil unit). Refer to system presale
literature or Price Pages for more details.
NOTE: Numbers in ( ) indicate quantities of more than 1. See Fig. 1
for 40QN high wall fan coil unit.
40QNB024 38HDC,L024
(2) 40QNB018 38HDS024*
(4) 40QNB018 38HDS048*
40QNB024, (2) 40QNB018 38HDS048*
(2) 40QNB024 38HDS048*
40QNH018 38BK018
40QNH024 38BK024
INSTALLATION
The 40QNB high wall fan coil unit is installed with either
the 38HDC,HDL condensing or 38HDS multi-split condensing outdoor unit, and the 40QNH unit is installed with the
38BK heat pump outdoor unit. Refer to Table1 to make sure
the correct indoor unit(s) is installed with the correct outdoor unit.
Installation instructions for the 40QN fan coil units are
contained in this manual. Refer to this manual for proper
installation of the complete system. Note that the 38HDC,
HDL, and BK outdoor units are shipped with installation and
service instructions for basic installation of the outdoor section. Be sure to make the modifications in Make Connections to Outdoor Unit section on page 13 of this literature,
so that the outdoor unit will operate properly with the 40QN
control system. Be sure the unit will be operated within the
application guidelines shown in Table 2. When installing the
38HDC, HDL, HDS, or BK unit, note that for cooling operation below 55 F (38HDC, HDL, BK), it is necessary to
equip the outdoor unit with the low ambient control accessory. The low ambient control is standard on 38HDS units.
To install this system, you will need:
• 40QNB or QNH fan coil unit(s)* with standard wireless
remote controller
• 38HDC, HDL, HDS, or BK outdoor unit
• low-ambient (38HDC, HDL, BK) or winter start (38HDS)
kit (if required for your application)
* More than one fan coil unit may be used with the 38HDS
multi-split units. Refer to 38HDS system Price Pages for
full details.
NOTE: Refrigerant pipe, drain pipe, wire, etc., are also re-
quired to install unit and are field supplied.
Be sure you have the required parts before beginning installation. The 40QN unit utilizes a microprocessor control
system to deliver optimum levels of comfort and efficiency.
Be sure to follow these instructions carefully to obtain proper
functioning of the unit.
Step 1 — Complete Pre-Installation Checks
UNPACK UNIT — Store unit in the original packaging
until it is moved to the final site for installation. When removing unit from carton, lift by its 4 corners. Also, note that
there is a plastic bag containing mounting screws taped to
the mounting bracket.
INSPECT SHIPMENT — Upon receipt of shipment check
unit (Fig. 1) for damage. Forward claim papers directly to
the transportation company. Manufacturer is not responsible
for damage incurred in transit.
Table 2 — Application Ranges
COOLING MODE
Maximum Minimum
Indoor
Unit
95FDB
71FWB 57FWB 0°FDB†
Maximum Minimum
Indoor
Unit
80FDB 75FDB
71FWB 65FWB
LEGEND
DB — Dry Bulb
WB — Wet Bulb
*38HDC, HDL and BK systems only.
†38HDS systems only.
NOTE: Unit may be equipped withalow-ambientcontrol(HDC,HDL,
BK) or winter start kit (HDS) that will allow operation down to −20 F.
Outdoor
Unit
115FDB
HEATING MODE (38BK Systems Only)
Outdoor
Unit
Indoor
Unit
67FDB 55FDB*
Indoor
Unit
55FDB 0°FDB
Outdoor
Unit
Outdoor
Unit
Check all items. See Table 3. If any item is missing notify
your Carrier distributor. To prevent loss or damage, leave all
parts in original packages until installation.
Step 2 — Select Location — Consult local building
codes and NEC for special installation requirements.
There are several ways the unit may be installed to different types of wall construction. These instructions do not
cover all installation methods. As a typical installation, these
instructions focus primarily on mounting the unit to wall studs
in new construction. See Fig. 2 for unit dimensions and
Fig. 3 for required clearances. Plan your installation carefully before you begin. Listed below are some guidelines that
should be followed when determining location for the unit.
1. Center unit (horizontally) on the wall selected.
2. Place the unit so it faces normal location of room
occupants.
3. Allow sufficient space for airflow clearance, wiring, re-
frigerant piping, and servicing unit. See Fig. 2 and 3.
4. Select walls that are:
a. Strong enough to support weight of the unit.
b. Accessible to convenient condensate drainage.
c. Free of obstacles that may block air circulation to the
fan coils.
d. Outside walls (if possible) to make piping easier.
5. Place top of fan coil unit as high on the wall as possible
making sure the unit is at least 10 in. down from ceiling
to permit proper air intake. Also, make sure that the unit
is not placed directly over anything to prevent filter removal or block airflow.
6. Make sure units are easily accessible to electrical power.
7. Refrigerantpipingcan enter the unit through the prepunched
holes. Refrigerant piping can run up or down along the
wall, to the right or left along the wall, straight through
the wall, or into the wall (Fig. 4). Once the piping is through
the wall, it can run inside walls, in ceilings, between floors,
or straight to the outside. See Fig. 5 for maximum line
lengths.
NOTE: Run refrigerant piping as directly as possible, and
avoid any unnecessary turns or bends.
8. Condensate piping can be directed through the inside wall
to an approved drain, or directed straight outside.
NOTE: The piping hole for condensate line must be made
at a downward slope to ensure proper drainage. See Mount
Mounting Bracket on Wall Section on page 5 for details.
2
1. Dimensions in ( ) are in millimeters.
2. Direction of airflow.
3. Refrigerant, drain, and power connections may be made in unit
rear, bottom, left side, or right side.
4. Refrigerant is metered by AccuRater™ device in the fan coil unit
on 38HDC, HDL and BK applications. A thermostatic expansion
valve is used in the outdoor unit on 38HDS applications. Insulate
both refrigerant lines on 38HDS and BK applications.
5. The 49 top and left side clearances are absoluteminimums.Clearances of 109 are recommended.
6. Do not insert a trap in condensate drain line. The drain is internally trapped.
Fig. 2 — 40QN Dimensional Drawing
UNIT
40QN
018 39 Lb (17.5 Kg)
024 43 Lb (19.5 Kg)
WEIGHT
3
Table 3 — High Wall Unit Package Contents
ITEM QUANTITY
Unit Mounting Template 1
Unit Mounting Bracket 1
1-in. Lag Screws For Unit Mounting 8
Hollow Wall Anchor Bolts For Unit Mounting 5
Wall Sleeve With Wall Cap 1
Infrared Wireless Remote Control Assembly 1
AAA Batteries (For Remote Control) 2
Remote Control Mounting Bracket 1
3
⁄8-in. Lag Screws For Remote Mounting Bracket 2
35 ft Long High Voltage Power Wiring (2-wire with ground) 1
35 ft Long Low Voltage Thermistor Wiring (3-wire) 1
AccuRaterT Body And Piston (018 and 024 Cooling Only Units)* 1
Biflow Filter Drier 1
Owner’s Manual 1
Installation Instructions 1
Warranty Registration Card 1
*For heat pumps: additional heating AccuRater body and piston shipped with outdoor unit.
*A clearance of 49 is the absolute minimum. A clearance of 109 is
recommended.
NOTE: Remove unit front cover for control box access.
Fig. 3 — Minimum Required Clearances
4
Fig. 4 — Refrigerant Piping
4. Temporarily hang unit on bracket to check location and
level.
If mounting bracket is not mounted level, the indoor section will be mounted unevenly, and condensate drainage water may drip onto the floor. Also, a gap between
the bracket and the wall may result in vibration and noise
from the indoor section.
5. Mark and cut condensate and piping holes.
a. For piping through the wall, mark the wall below the
condensate connection and cut a 2
1
⁄2-in. hole into the
wall at either point ‘‘A’’ or point ‘‘B’’ in Fig. 7.
NOTE: The 2
to ensure proper condensate drainage. See Fig. 8. Slope
condensate line at a minimum pitch of
1
⁄2-in hole must be made at a downward slope
1
⁄4in. per foot of
line. The condensate line cannot be run up for upper piping connections − only refrigerant lines may be run up.
b. Push the wall sleeve (factory supplied with the unit)
through the 2
1
⁄2-in. wall opening.
Step 4 — Connect Refrigerant Piping — Fan coil
units may be connected to the outdoor units using fieldsupplied refrigerant grade piping. Refer to Tables 4A-4F for
the correct size piping. The length of refrigerant pipe depends on the unit placement and building structure; run pipes
as directly as possible. For piping requirements over 50 ft of
total run, or more than 25 ft of lift, consult the long line
application guidelines available in the product presale literature, or contact your local representative. For the 38HDS024
unit, the maximum pipe length is 50 ft.
*38HDC, 38BK/38HDL/38HDS systems.
Fig. 5 — Maximum Line Lengths
Step 3 — Mount Mounting Bracket on Wall
1. Decide how refrigerant will be piped. If necessary, knock
out the appropriate pre-punched holes (Fig. 4) on unit for
piping and electrical connections.
2. Remove bracket from fan coil unit by pulling it down
from fan coil unit bottom as shown in Fig. 6.
3. Using a carpenter’s level, fasten mounting brackets into
the studs in the wall at least 10 in. away from the ceiling
with the 8 screws provided.Always be sure to insert screws
into the top 2 holes indicated in Fig. 6. Make sure the
attached bracket will support a 200 lb vertical load. For
a masonry wall, anchor shields can be used to attach bracket
to the wall.
The 40QNB,QNH unit is shipped with a factory holding charge of R-22. DO NOT BURY MORE THAN
36 IN. OF REFRIGERANT PIPE IN THE GROUND.
If any section of pipe is buried, there must be a 6-in.
vertical rise to the valve connections on the outdoor unit.
If more than the recommended length is buried, refrigerant may migrate to the cooler, buried section during
extended periods of unit shutdown, causing refrigerant
slugging and possible compressor damage at start-up.
Use the following instructions to connect piping.
1. Installinsulation.Insulate all refrigerant lines on heat pumps
and 38HDS systems to prevent condensation. It is extremely important that all refrigerant lines and the
AccuRatert metering device be insulated on heat pumps.
On 38HDC, HDL cooling only units, the liquid line may
be left uninsulated. Use any acceptable heat resistant closedcell foam insulation (minimum
3
⁄8-in. wall thickness). When
insulating piping, cap ends and slide insulation over the
piping. Insulation can also be cut and placed over piping.
2. Run liquid and gas refrigerant piping.
a. Run pipes as directly as possible, and avoid any un-
necessary turns and bends.
b. Suspend refrigerant pipes so that the insulation is not
damaged and vibrations are not transmitted to the
structure.
c. Leave slack in the refrigerant pipe between the struc-
ture and the unit to absorb vibrations.
5
NOTE: Use either point ‘‘A’’ or point ‘‘B.’’
Fig.7—WallHole Location for Rear Piping
Fig. 8 — Piping Hole
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. Use Table 5 to verify that the
correct piston for your system has been shipped with
the unit.
NOTE: No AccuRatert device is installed on 38HDS
systems. The 38HDS systems have a TXV (thermostatic expansion valve) in the condensing unit for refrigerant metering and control.
e. On heat pump installations, install factory-supplied pis-
ton in the AccuRater metering device located in the
service valve on the outdoor unit (Fig. 10). Make sure
Teflon seal on the piston faces toward the outdoor unit.
Use Table 5 to verify the correct piston for your system has been shipped with the unit. Refer to 38BK
installation instructions for more details.
f. Install a liquid line filter drier near the outdoor unit
(38HDC, HDL and 38BK). On heat pump systems, a
bi-flow filter drier must be used. DO NOT install a filter drier in 38HDS systems.
3. Insulate and caulk wall openings to reduce air infiltration
and refrigerant pipe vibrations on structure.
4. Evacuate piping, if necessary. If either refrigerant piping
or the indoor coil is exposed to atmospheric conditions,
it must be evacuated to 1000 microns to eliminate contamination and moisture in the system.
6
Table 4A — Physical Data — 38HDC Condensing Units
UNIT 38HDC 018 024
NOMINAL CAPACITY (Tons) 1
OPERATING WEIGHT (lb) 150 154
REFRIGERANT TYPE R-22
Control (Cooling) AccuRaterT Piston at Fan Coil Unit
Factory Charge (lb) 3.6 4.8
COMPRESSOR TYPE Tecumseh Reciprocating Copeland Scroll
Model AW5517G ZR23K1
Oil (Recharge) (oz) 30 25
Crankcase Heater (Watts) 19 None
Accumulator Yes
OUTDOOR FAN Propeller, Direct Drive
Rpm 850 850
Diameter (in.)...No. of Blades 18...3 18...3
Pitch (Degrees) 25 27
Motor Hp
Nominal Air Cfm 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Rows 6.1...1.5 6.1...2
Fins/in. 15 15
CONTROLS
High-Pressure (psig)
Cut-in 320±20
Cutout 426 ± 7
Low-Pressure (psig)
Cut-in 22 ± 5
Cutout 7± 3
Fusible Plug 210 F
Control Voltage* 24
REFRIGERANT LINES
Connection Type Sweat
Liquid Line OD (in.)
Vapor Line OD (in.)
Maximum Length (ft) 200 200
Maximum Lift Fan Coil (Above Outdoor) (ft) 65 65
Maximum Lift Fan Coil (Below Outdoor) (ft) 150 150
*24 v and a minimum of 40 va is provided in the fan coil unit.
1
⁄
2
1
⁄
8
3
⁄
8
5
⁄
8
2
1
⁄
8
3
⁄
8
5
⁄
8
Table 4B — Physical Data — 38HDL Condensing Units
UNIT 38HDL 018 024
NOMINAL CAPACITY (Btuh) 18,000 24,000
UNIT OPERATING WEIGHT (lb) 130 136
COMPRESSOR Hermetic
Type Copeland Scroll Copeland Scroll
Model ZR18KC-PFV ZR24KC-PFV
Oil (oz) Initial/Recharge 25/21 25/21
OUTDOOR FAN Propeller Type, Direct Drive, Horizontal
Rpm 850 850
Diameter (in.)-No. of Blades 18-3 18-3
Fan Pitch (Deg) 25 27
Motor Hp
Nominal Airflow (cfm) 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Plate Fin
Face Area (sq ft)...No. of Rows 6.1...1 6.1...1.5
Fins per inch 20 20
CONTROL PRESSURESTAT Settings
Low Pressure
Cut-out (psig) 7±3
Cut-in. (psig) 22±5
Fusible Plug 210 F
REFRIGERANT LINES
Connection Type Sweat
Maximum Length (ft) 100
Maximum Lift (ft) — Fan Coil (Above Outdoor) 65
Maximum Lift (ft) — Fan Coil (Below Outdoor) 75
1
⁄
8
1
⁄
8
7
Table 4C — Physical Data — 38HDS Condensing Units
UNIT 38HDS 024 048
NOMINAL CAPACITY (Tons) 24
OPERATING WEIGHT (lb) 159 292
REFRIGERANT TYPE R-22
Control (Cooling) TXV in Condensing Unit
Factory Charge (lb)*
Circuit A 5.0 5.5
Circuit B — 5.5
COMPRESSOR TYPE Copeland
Quantity...Model 1...ZR23K1 2...ZR49K3
Oil (Recharge) (oz) 25 53
OUTDOOR FAN Propeller, Direct Drive
Rpm 850 850
Diameter (in.)...No. of Blades 18...3 24...3
Pitch (Degrees) 27 24
Motor Hp
Nominal Air Cfm 1720 3900
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Rows 6.1...2 12.3...2
Fins/in. 15 15
CONTROLS
High-Pressure (psig)
Cut-in 320±20
Cutout 426±7
Low-Pressure (psig)
Cut-in 22±5
Cutout 7±3
Fusible Plug 210 F
Control Voltage 24
REFRIGERANT LINES
Connection Type Sweat
Vapor Supply Line Quantity...OD (in.) 2...
Vapor Return Line Quantity...OD (in.) 2...5⁄
Maximum Length (ft) 50 50
Maximum Lift Fan Coil (Above Outdoor) (ft) 30† 30†
Maximum Lift Fan Coil (Below Outdoor) (ft) 30† 30†
1
⁄
8
3
⁄
8
8
Scroll
EXTERNAL FINISH Alpine Mist (Beige)
LEGEND
TXV — Thermostatic Expansion Valve
*Charge is based on 25 ft of interconnecting line.
†Maximum system lift is 30 ft between lowest system component and highest system component.
Table 4D — Physical Data — 40QNB High Wall Fan Coil Units
UNIT 40QNB 018* 024*
NOMINAL CAPACITY (Tons) 1
NOMINAL SIZE (Btuh) 18,000 24,000
OPERATING WEIGHT (lb) 38.5 42.9
MOISTURE REMOVAL RATE (Pints/Hr) 5.6 6.3
FINISH White
REFRIGERANT R-22
Control (Cooling) AccuRaterT Metering Device
System Charge Required (lb)† 4.6 5.3
INDOOR FAN Direct Drive Centrifugal
Rpm...Cfm High 1120...550 1470...570
Rpm...Cfm Medium 1050...500 1370...466
Rpm...Cfm Low 950...450 1270...417
Motor Watts 44 49
Blowers — No. ...Size (in.) 2...3.94 x 17.8 2...3.94 x 17.8
INDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft) 2.56 2.56
No. of Rows 23
Fins/in. 15.9 18.1
Circuits 23
FILTERS Cleanable
(Quantity) Size (in.) (3) 11
AIRSWEEP
Horizontal Manual
Vertical Automatic
CONTROLS Integrated Microprocessor
Remote Controller Wireless
Freeze Protection Yes
Auto. Restart Yes
Diagnostics Yes
Timer Mode 24-Hour Startup/Shutdown Type
Test Mode Yes
Dehumidification Mode Yes
Fan Mode High/Medium/Low/Auto.
Control Voltage 24 v
REFRIGERANT LINES
Connection Type Male Flare
Liquid Line OD (in.)
Vapor Line OD (in.)
CONDENSATE DRAIN CONNECTION (in.)
*Units may only be matched with 38HDC, 38HDL and 38HDS outdoor units.
†Full factory charge shipped in outdoor unit. Charge shown is for smallest system combination and is determined based on 25 ft of line.
1
⁄
2
1
⁄2x173⁄
4
3
⁄
8
5
⁄
8
5
⁄8OD,7⁄16ID
1
4...3⁄
4...5⁄
2
3
⁄
8
5
⁄
8
⁄
4
8
8
8
Table 4E — Physical Data — 38BK018, 024 Outdoor Heat Pump Units
NOMINAL CAPACITY (Tons) 1
UNIT 38BK018* 38BK024*
OPERATING WEIGHT (lb) 154 167
REFRIGERANT TYPE R-22
Control (Cooling) AccuRaterT Piston at Fan Coil Unit
Control (Heating) AccuRater Piston at Outdoor Unit
Factory Charge (lb)† 1.5
COMPRESSOR TYPE Tecumseh Reciprocating
Model AW5519G AW5524G
Oil (Recharge) (oz) 30 30
CRANKCASE HEATER (Watts) 19 19
OUTDOOR FAN Propeller, Direct Drive
Rpm 850 850
Diameter (in.)...No. of Blades 18...3 18...3
Pitch (Degrees) 25 27
Motor Hp
Nominal Air Cfm 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Coils 6.1...1.5 6.1...2
Fins/in. 15 15
CONTROLS
High-Pressure (psig)
Cutout 320±20
Cut-in 426 ± 7
Liquid Line Low-Pressure (psig)
Cutout 7± 3
Cut-in 22 ± 5
Fusible Plug 210 F
Defrost Method** Time and Temperature Defrost
Accumulator Yes
Control Voltage†† 24 v
REFRIGERANT LINES
Connection Type Sweat—Suction; Flare—Liquid
Liquid Line OD (in.)
Vapor Line OD (in.)
Maximum Length (ft) 200 200
Maximum Lift (Fan Coil Above) (ft) 65 65
Maximum Lift (Fan Coil Below) (ft) 150 150
*These units may only be used with 40QNE fan coil units.
†These units are shipped with a holding charge only.
**Demand defrost when used with 40QNE fan coil units.
††A 24-v transformer is provided in the fan coil unit; 38BK018 and 024 units have their own transformers.
1
⁄
2
1
⁄
8
3
⁄
8
5
⁄
8
2
1
⁄
8
3
⁄
8
5
⁄
8
9
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