Carrier 40MKCB**C/24AHA4 User manual

Installation Instructions
40MKCB**C/24AHA4
40MKCB**C/124ANS
40MKQB**C/25HHA4
40MKQB**C/224ANS
Cassette Ductless Split
Sizes 18 to 34
Fig. 1 -- Indoor Unit, Outdoor Unit, and Remote Control
NOTE:Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1
PARTS LIST 2
DIMENSIONS -- INDOOR 4
DIMENSIONS -- OUTDOOR 5
CLEARANCES -- INDOOR 7
CLEARANCES -- OUTDOOR 7
SYSTEM REQUIREMENTS 7
INSTALLATION 9
INSTALL INDOOR UNIT 9
INSTALL OUTDOOR UNIT 12
ELECTRICAL DATA 16
START--UP 20
TROUBLESHOOTING 23
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury or
equipment damage.
Puron refrigerant systems operate at higher pressures than
standard R--22 systems. To avoid damage to the unit or
possible personal injury, do not use R--22 service equipment or
components on Puron refrigerant equipment.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have a fire
extinguisher available. Read these instructions thoroughly and follow
all warnings or cautions included in the unit literature and on labels
attached to the unit. Consult local building codes and current editions
of the National Electrical Code ( NEC ) NFPA 70. In Canada, refer to
current editions of the Canadian electrical code CSA 22.1.
Recognize safety information. This is the safety--alert symbol !!
When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury. Understand these signal
words; DANGER,WARNING,andCAUTION. 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 hazards which could result in personal injury or
death. CAUTION is used to identify unsafe practices which may
result in minor personal injury or product and property damage.

2
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
pollution.
Remove and recycle all components or materials (i.e. oil,
refrigerant, etc.) before unit final disposal.
CAUTION
!
INSTALLATION
IMPORTANT: Effective January 1, 2015, all split systems and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts have sharp edges or burrs, Use care and wear
appropriate protective clothing and gloves when handling
parts.
CAUTION
!
PERSONAL INJURY AND EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and / or equipment damage.
DO NOT operate the unit without a filter or with grille
removed.
CAUTION
!
These instructions cover the installation and the start--up of the
systems listed in Table 1.
Table 1 – Matched Systems
System
Type
Nominal
Capacity
KBTU/Hr Outdoor Unit Indoor Unit
Cooling
Only
018 24AHA418A003 124ANS018000 40MKCB18C--3
024 24AHA424A003 124ANS024000 40MKCB34C--3
030 24AHA430A003 124ANS030000 40MKCB34C--3
034 24AHA436A003/5/6 124ANS036000 40MKCB34C--3
Heat
Pump
024 25HHA424A003 224ANS024000 40MKQB34C--3
030 25HHA430A003 224ANS030000 40MKQB34C--3
034 25HHA436A003/5/6 224ANS036000 40MKQB34C--3
PARTS LIST
Indoor Unit
TXV Kit
The cassette type unit and horizontal discharge unit (24AHA/124ANS
and 25HHA4/224ANS) installation would not be complete without
the addition of the TXV kit. This can be found in the packaging of the
indoor unit. If you do not have this kit, order the kit and install the
outdoor and indoor units when this is available.
Below are figures of the kit and how and where the kit is included
within the indoor unit packaging.
Refrigerant
flow direction
Liquid pipe
Gas pipe
A150289
Fig. 2 -- TXV Kit
Flexible pipings
(Field)
TXV Kit
TXV Kit
Flexible pipings
(Field)
A150286
Fig. 3 -- TXV Kit (within packaging of indoor unit)

3
Table 2 – Indoor Units Parts List
Name of Part Qty. Usage
Owner’s Manual 1Guide for the homeowner
Warranty card 1Warranty information
Installation instructions 1Guide to install the unit
Pipe insulation Material 1Insulation for refrigerant
piping
Clamp filter 2
For conforming to EMC
standards on connecting
wires
Flexible hose 1Drains moisture from inside
the indoor unit
Pipe clamp 1Fixes the flexible hose to the
indoor unit
Remote Controller 1Controls the indoor unit
Remote Controller holder 1Holds the remote controller
on the wall
Tapped Screw 2Used to fix the remote
controller holder
Battery 2Powers the remote controller
Strain relief bracket 1To affix strain relief to hold
wires in place
Screws 4To affix strain relief bracket
Cassette Cover Panel
A cassette grille/panel is required to complete installation of indoor
unit. The indoor unit installation would not be complete without the
addition of this grille. Order it and complete installation when you
have the grille available. The grille model number is:
40MK--B01C----3.
Fig. 4 -- Cassette Grille/Panel
Outdoor Unit
The following items are included with the outdoor unit:
A09536
Fig. 5 -- 24AHA/124ANS
A09537
Fig. 6 -- 25HHA4/224ANS
Table 3 – Outdoor Unit Parts Checklist
Model Filter
Drier
Piston
Cap Pistons Flare Connector
24AHA4/124ANS n
25HHA4/224ANS n n n n

4
DIMENSIONS - INDOOR
Drain pipe
connector
Refrigerant pipe
connector
Fresh air intake (
Φ75mm)
W
H
D
W
H
Cassette Grille
Cassette Body
A150291
Fig. 7 -- 40MKC**C, 40MKQ**C Unit and Panel Dimensions
Table 4 – Dimensions Indoor
Indoor Unit Size
BTU/Hr Height (H) in (mm) Width (W) in (mm) Depth (D) in (mm) Operating Weight lb (kg)
18K 33.1 (840) 33.1 (840) 8.1 (205) 54.0 (24.5)
24K – 34K 33.1 (840) 33.1 (840) 11.3 (287) 68.6 (31.1)
Cassette Panel 37.4 (950) 37.4 (950) 2.2 (55) 11.0 (5)

5
DIMENSIONS -- OUTDOOR
Fig. 8 -- Outdoor Unit Dimensions
NOTE:
SCenter of Gravity
SAll dimensions are in “inches” unless noted.
UNIT SIZE
MINIMUM
MOUNTING PAD
DIMENSIONS
18,24 23” x 42”
30,36 24” x 50”

6
Table6–Dimensions(ACs)
124ANS018000 /
124ANS024000/ 12ANS030000/ 124ANS036000/
Table7–DimensionsSI(ACs)
124ANS018000
124ANS024000
124ANS030000
124ANS036000
Table 8 – Dimensions (HPs)
224ANS024000/ 224ANS030000/
224ANS036000/24HHAA436 0 X XX 197 227
Table9–DimensionsSI(HPs)
224ANS024000/ 224ANS030000/
224ANS036000/
6 X XX022.2 89.4 103.0

7
CLEARANCES -- INDOOR
A150152
Fig. 9 -- 40MKC**B, 40MKQ**B Unit Clearance
CLEARANCES -- OUTDOOR
1. Single Unit Applications: With coil facing wall: Allow 6”
(152.4mm) minimum clearance on coil side and coil end and
20” (504.0 mm) minimum clearance on fan side. Allow 24”
(609.6 mm) minimum clearance on compressor end for
service.
2. With fan facing wall: Allow 8” (203.2 mm) minimum
clearance on fan side and coil end and 20” (504.0 mm)
minimum clearance on coil side. Allow 24” (609.6 mm)
minimum clearance on compressor end for service when units
are stacked or there is less than 40” (1016 mm) of clearance
above the unit. If there is 40” (1016 mm) clearance above unit
and the top panel is accessible for removal allow 8” (203.2
mm) minimum clearance on compressor end for service.
3. Multi--unit Applications: Allow 24” (609.6 mm) minimum
clearance between fan and coil sides of multiple units. Arrange
units so discharge of one does not enter inlet of another. Allow
24” (609.6 mm) minimum clearance on compressor end when
units are stacked or there is less than 40” (1016 mm) of
clearance above the unit. If there is 40” (1016 mm) clearance
above unit and the top panel is accessible for removal allow 8”
(203.2 mm) minimum clearance on compressor end for
service. When two units are installed end to end with the coil
ends facing each other allow 12” (304.8 mm) minimum
clearance between units.
IMPORTANT: When installing multiple units, ensure the
discharge air from one unit is not drawn into another unit. When
installing single or multiple units in an alcove, roof well, or
partially enclosed area, ensure there is adequate ventilation to
prevent recirculation of discharge air.
SYSTEM REQUIREMENTS
Clearances
Allow sufficient space around the indoor and outdoor unit for
proper airflow circulation and servicing. Refer to Fig.9 and the
outdoor unit clearance section for minimum required clearances.
Piping: Piping and insulation is field supplied.
Piping Lengths
The minimum length between the indoor and outdoor units is 10 ft
(3 m). Refer to table 9 for the maximum lengths allowed.
Table 9 – Maximum Refrigerant Line Lengths
Unit Size Max Line
Length* ft(m
Max Elevation
(ID over OD)
ft(m)
Max
Elevation (OD
overID)ft(m)
18K-34K 250 (76.2) 65 (19.8) 200 (61)
Note:Forlengthsgreaterthan25ft(7.6m),refertotheResidential Long
Line Guide.
Pipe Sizes
In some models, indoor unit and/or outdoor unit pipe sizes may
differ from those in TXV connections. Coupling is required in
those cases. See Table 10 for complete list of tube sizes to identify
coupling needs.
Table10–PipeSizes
Indoor Unit Outdoor Unit
Indoor Unit Tube
Sizes (in)
TXV Kit Tube
Sizes (in)
Outdoor Unit
Tube Size (in)
Liquid Vap or Liquid Vapo r Liquid Vap or
40MKCB18C----3 24AHA418
124ANS018
3/8
5/8
3/8
5/8
3/8
5/8
40MKCB34C----3 24AHA424
124ANS024 3/4 3/4 3/4
40MKCB34C----3 24AHA430
124ANS030 3/4 3/4 3/4
40MKCB34C----3 24AHA436
124ANS036 3/4 3/4 7/8
40MKQB34C----3 25HHA424
224ANS024 3/4 3/4 3/4
40MKQB34C----3 25HHA430
224ANS030 3/4 3/4 3/4
40MKQB34C----3 25HHA436
224ANS036 3/4 3/4 7/8
Note:Both lines need to be insulated using at least 1/2 inch closed foam
insulation.

8
Condensate Drain Pipe Sizes
Refer to table 11 for the required sizes.
Table 11 – Drain Pipe Sizes
Indoor Unit Size
BTU/Hr Outside Diameter in (mm)
18K 1 (25.4)
24K – 34K 1 (25.4)
Refrigerant Charge
The outdoor units can be matched with multiple indoor units and
thus a different amount of charge might be required when matched
with the 40MKCB**C or 40MKQB**C units. Charge to
Sub--cooling Delta from Rating Plate Value as stated below.
Table 12 – Charge Requirements
System
Type
Nominal
Capacity
kBTU/Hr
Outdoor Unit Indoor Unit
Charge to
Sub--cooling Delta
from Rating Plate
Va lu e
Cooling
Only
018 24AHA418A003 124ANS018000 40MKCB18C----3 12
024 24AHA424A003 124ANS024000 40MKCB34C----3 12
030 24AHA430A003 124ANS030000 40MKCB34C----3 12
034 24AHA436A003/5/6 124ANS036000 40MKCB34C----3 8
Heat
Pump
024 25HHA424A003 224ANS024000 40MKCB34C----3 14
030 25HHA430A003 224ANS030000 40MKCB34C----3 11
034 25HHA436A003/5/6 224ANS036000 40MKCB34C----3 14
NOTE::The above additional charge is required amount for
line lengths up to 25 ft (7.6 m). For line lengths exceeding 25 ft
(7.6 m), additional charge will be required. Refer to the
Residential Long Line Guide.
Metering Device
The 40MKC(Q)*C unit uses a TXV while the outdoor unit uses a
type B accurator. The cooling metering device is installed with the
indoor unit. The heating metering device is installed with the
outdoor unit. One metering device is required for the cooling only
system and two are required for the heat pump systems. Refer to
Table 13 for a breakdown of each unit’s metering devices.
Table 13 – Metering Devices
System Size
kBTU/hr Cooling Only Heat Pumps
40MKCB**C 40MKQB**C 25HHA4/224ANS
018 TXV - -
024 TXV TXV 0.049"
030 TXV TXV 0.055"
034 TXV TXV 0.063"
Power and Connecting Cables -- Field Supplied
Recommended Connection Method for Power and
Communication Wiring (To minimize communication
wiring interference)
Power Wiring:
The main power is supplied to both the indoor and the outdoor
units. The field supplied connecting cable consists of three (3)
wires. Two wires are high voltage AC power and one is a ground
wire.
Consult your local building codes and the NEC (National
Electrical Code) or CEC (Canadian Electrical Code) for special
requirements.
All wires must be sized per NEC or CEC and local codes. Use
Electrical Data table MCA (minimum circuit amps) and MOCP
(maximum over current protection) to correctly size the wires and
the disconnect fuse or breakers respectively.
Per caution note, only copper conductors with a minimum 300 volt
rating and 2/64--inch thick insulation must be used.
Communication Wiring:
A separate shielded copper conductor only with a minimum 300
volt rating and 2/64--inch thick insulation must be used as the
communication wire from the outdoor unit to the indoor unit. To
minimize voltage drop of the communication wire, use the wire
size and maximum lengths shown in table 14.
Table 14 – Maximum Lengths
Wire Size Length ft. (m)
18AWG 50 ft. (15 m)
16AWG 50 ft. (15 m) to 100 ft. (30 m)
EQUIPMENT DAMAGE HAZARD
Failure to follow the following caution may result in
equipment damage or improper operation.
Wires should be sized based on NEC and local codes.
Use copper conductors only with a minimum 300 volt
rating and 2/64 inch thick insulation.
CAUTION
!
User Interface
The indoor unit is supplied with a wireless remote control to
operate the unit (an Owner’s Manual is supplied with the unit). The
following accessories are available.
SWall mounted control.
Operating Range
Ensure that the system operates within the application guidelines
shown in the following tables.
Table 15 – Cooling Operating Range
Maximum Minimum
DB °F (°C) WB °F (°C) DB °F (°C) WB °F (°C)
Outdoor
Unit 125 (51.7) -55 (12.8) -
Indoor Unit 90 (32) -64 (18) -
Table 16 – Heating Operating Range
Maximum Minimum
DB °F (°C) WB °F (°C) DB °F (°C) WB °F (°C)
Outdoor
Unit 75 (23.9) 67 (19.4) 17 (-8.3) -
Indoor Unit 80(27) 32 (0) -
Accessories
An extensive list of field installed accessories is available for both
indoor and outdoor units. Identify what accessories, if any, are
required for the application at hand and consult the separate
installation instructions for the accessories. Some of the
accessories, especially on the indoor units, can be installed much
easier if planned ahead.

9
INSTALLATION
Complete Pre--installation Checks
1. Unpack Unit -- Store the indoor and outdoor units in the orig-
inal packaging until it is moved to the final site for installation.
When unpacking indoor unit, be careful not to lift unit by con-
densate drain discharge pipe or by refrigerant connections.
2. Inspect Shipment -- Upon receipt of shipment, check the in-
door and outdoor units for damage. If there is any damage,
forward claim papers directly to the transportation company.
Manufacturer is not responsible for damage incurred in transit.
3. Inspect Parts Supplied With Units – Check all items
against parts list (see the PARTS LIST section). If any items
are missing, notify your distributor or manufacturer office.
To prevent loss or damage, leave all parts in original pack-
ages until installation.
Consider System Requirements
1. Consult local building codes and NEC for special installa-
tion requirements.
2. When deciding the location of the indoor and outdoor units,
ensure that the piping run does not exceed the allowed dis-
tances listed in Table 9.
3. Make sure the indoor and outdoor units are easily accessible
to electrical power.
4. Allow sufficient clearances for airflow, wiring, refrigerant
piping, and servicing the unit (see the ”CLEARANCES --
INDOOR” and “CLEARANCES -- OUTDOOR” sections).
5. Condensate piping can be directed through the inside wall
to an approved drain or straight outside.
INSTALL INDOOR UNIT
Plan the installation carefully before you begin.
1. Select indoor unit location.
a. Where it is out of direct sunlight.
b. Where the airflow is not blocked.
c. Where an optimum air distribution is ensured.
d. Where the condensate can drain correctly and safely.
e. A ceiling that prevents vibration and is strong enough to
hold the product weight.
f. Maintain sufficient clearance around the indoor unit for
maintenance and servicing. Refer to the clearances sec-
tion of this document.
g. Where the air filter can be removed and cleaned easily.
h. Where the piping between the indoor and outdoor units
is within the allowable limits.
i. Install the indoor unit 1m or more away from the TV or
radio to prevent the screen from being distorted or noise
from being generated.
j. Install the indoor unit as far away as possible from fluo-
rescent and incandescent lights so that the remote con-
trol can be operated well.
k. Do not install units too close to humid conditions.
2. TXV Installation
a. Location -- The TXV kit can be affixed directly to the
indoor unit or anywhere between 12 to 18 inches from
the indoor unit pipe connection.
!CAUTION
Failure to follow the following caution may result in equipment
damage or improper operation.
The TXV kit needs to be installation at most 12 to 18 inches
from the indoor unit pipe connection.
b. The TXV contains a label specifying the allowed flow
direction. See below for allowed and not allowed flow
directions.
!CAUTION
Failure to follow the following caution may result in equipment
damage or improper operation. One of the two arrows on the
TXV part number label must point up when installed.
Install unit such that the refrigerant flow directions is in any of
the two allowed directions.
Indoor unit
connection
Outdoor unit
connection
Indoor unit
connection
Outdoor unit
connection
Arrows on TXV label pointing
upward and to the right
Arrows on TXV label pointing
upward and to the left
Fig. 10 -- Allowed TXV installation direction per label at-
tached to TXV
Refrigerant
flow direction
To
indoor
unit To
outdoor
unit
Fig. 11 -- TXV Flow Direction

10
To
indoor
unit To
outdoor
unit
Refrigerant Flow Direction
Liquid pipe
Gas pipe
To
indoor
unit To
outdoor
unit
Refrigerant flow direction
Liquid pipe
Gas pipe
Fig. 12 -- Allowed Refrigerant Flow Direction
Refrigerant Flow Direction Refrigerant Flow Direction
Fig. 13 -- Refrigerant Flow Direction Not Allowed
c. Once location and flow direction is identified, connect
piping between indoor unit and TXV kit. Flexible pip-
ing is recommended.
!CAUTION
Failure to follow the following caution may result in equipment
damage or improper operation.
Insulate liquid and vapor pipes connecting to indoor and
outdoor units.
Piping connection ports
(Gas side and liquid side)
Flexible pipings
(Field supplied)
TXV Kit
TXV Kit
Connect to
interconnection pipings
Flexible pipings
(Field supplied)
Refrigerant flow
Direction
Fig. 14 -- TXV Attached to Cassette Body
Piping connection ports
(Gas side and liquid side)
Connection to
outdoor unit
TXV Kit
Flexible pipings
(Field supplied)
maximum length
allowed: 12 - 18 in
A150294
Fig. 15 -- TXV Kit not Attached to Cassette Body
3. Install Suspension Bolts
a. Mark the spots on the ceiling where you want to install
the indoor unit.
b. Drill holes at the marking spots and then insert bolt an-
chors. Use existing ceiling supports or construct a suit-
able support. Use a hole--in--anchor, sunken insert for
existing ceilings.
c. Depending on the type of ceiling, fix the threaded hang-
ers as shown in Fig. 16 and Fig. 17.
d. Insert the washers as shown in Fig. 16 and Fig. 17.
e. Remove the “T” bar in ceiling to facilitate installation.
See Fig. 17. If the “T” bar cannot be removed from the
ceiling, the unit may have to be tilted as shown in Fig.
18.

11
Washer
Threaded hangers
Washer
Nut
Nut
Nut
Wooden frame
Threaded hangers
Washers
Nut
A07186
Fig. 16 -- Attach Hangers to Ceiling
Threaded hangers
"T" bar
(to be removed)
A07187
Fig. 17 -- Threaded Hangers and “T”Bar
Supension Brackets
Supension Brackets
Threaded Hangers
T-Bar
T-Bar
Threaded Hangers
T-Bar
A07188
Fig. 18 -- Positioning Unit in Ceiling
4. Hanging the Indoor Unit:
a. Screw double nuts to each suspension bolts making
space for hanging the indoor unit
b. Use a stacker to lift the unit to the installation site.
A07185
Fig. 19 -- Positioning Unit
c. Hang the indoor unit to the suspension bolts between
two nuts.
d. Screw the nuts to suspend the unit. Check the lower side
of indoor unit locates at position (10 to 12 mm) higher
than the lower surface of the ceiling. L is about half of
the screw length of the installation hook.
e. Adjust level of the unit by using level vial to make sure
the horizontal level of the main body is within 1°.
2.3.2 Hang the indoor unit to the suspension bolts between two nuts.
Screw nut
Washer
Hanging
screw bolt
Overhang part
Shockproof cushion
Ceiling
Body
10~12mm
L
Fig. 20 -- Suspension Bolt Details
5. Install the Drain Pipe
The cassette unit is equipped with a condensate pump. Use the
following steps to install the drain piping.
a. Remove the cover of the drain hose connection port.
b. Insert the flexible hose onto the drain hose port. Secure-
ly fix the flexible hose to the indoor unit with a pipe
clamp.
c. Install the flexible hose onto the PVC water pipe (field
supplied, O.D. 1”) with PVC adhesive.
NOTES:
The drain pipe should be install within 200mm from the flexible
hose connection at the indoor unit.
To ensure correct condensate water flow, the pipe should have a
gradient of 2% without obstruction. see figure 21.
d. Make a trap of at least 2 in. (51 mm) in depth to prevent
unpleasant odors from reaching the room.
e. Insulate condensate pipe with condensation proof mate-
rial such as polyurethane, propylene, or neoprene of
3/16 in. to 3/8 in. thickness.
Pipe clamp
Indoor unit Flexible hose
Drain hose connection port
PVC water pipe O.D.:Φ25)
PVC adhesive
Lean over 2%
1.0-1.5m
Max. 750mm
<200mm
Drain hose connection port
A150296
Fig. 21 -- Drain Pipe Connection
f. Drill a 2--3/4 in. (70 mm) hole in the wall with a 3/16
in. to 3/8 in. (4.8 -- 9.5 mm) slope toward the outside
(see Fig. 22). This hole will be used for the piping (re-
frigerant and condensate) and control wiring

12
Indoor
Outdoor
3/16"
÷
3/8"
(5
÷
10 mm)
"
4/3-
2
÷
"
3
m0
8/0
7
(m)
Fig. 22 -- Drilling for Connections
6. Install the panel:
a. Push the two grille switches simultaneously, then lift the
grille up and remove the air inlet grille. Take out the
covers from the 4 corners (see Fig. 23).
Grille switch
Fig. 23 -- Inlet Grille Removal
b. Align the corner marked with the piping and drain side
with the piping and drainage interfaces of the main
body.
c. Hang the panel to the hooks on the main body.
d. Tighten the screw evenly under the panel hook until the
thickness of the sponge between the main body and
panel is reduced to about 4~6mm. The edge of the panel
should contact the ceiling well.
e. Connect the swing motor connector to the
corresponding plug on the main body.
Piping port
Drain port
Hook panel
Screw
Cross-screwdriver
Fig. 24 -- Installing the Cassette Panel
f. Hang the hook behind the air inlet grille on to the panel.
g. Connect the display connector to the corresponding
plug on the main body (see Fig. 25).
h. Close the air inlet grille.
i. Press the installation cover gently into the panel.
Installation
cover’s rope
Tap Screw
Slide the four sliders
in the corresponding
channel when installing
the cover
Fig. 25 -- Display Wire Connection
INSTALL OUTDOOR UNIT
The outdoor units can be installed on the ground, on the roof, or
mounted on a wall.
NOTE:Install the unit so that the coil does not face into
prevailing winds. If this is not possible and constant winds
above 25 mph are expected, use the accessory wind baffle. See
the installation instructions provided with the accessory kit.
Wind baffles should also be used on all units with accessory
low ambient temperature control.
Mounting on Ground
1. Mount unit on a solid level concrete pad.
2. If a heat pump is being installed, use a field-- provided snow
stand or ice rack where prolonged subfreezing temperatures
or heavy snow occurs.
3. Position unit so water or ice from roof does not fall directly
onto unit.
4. On cooling only units, an accessory stacking kit can be used
when units are to be stacked. See installation instructions
provided with the accessory kit.
Mounting on Roof
IMPORTANT: Mount unit on a level platform or frame at least 6
in. (152.4 mm) above roof surface. Isolate unit and tubing from
structure.
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this caution may result in personal injury
and/or equipment damage.
Be sure unit panels are securely in place prior to rigging.
CAUTION
!
1. Rig the unit. Keep the unit upright and lift using a sling.
Use cardboard or padding under the sling, and spreader bars
to prevent sling damage to the unit. See Fig. 26 for center of
gravity reference
2. Mount unit on a solid concrete pad or platform.
3. Isolate unit and piping from structure
4. If a heat pump is being installed, use a field-- provided snow
stand or ice rack where prolonged subfreezing temperatures
or heavy snow occurs.
5. On cooling only units, an accessory stacking kit can be used
when units are to be stacked. See installation instructions
provided with accessory kit.

13
A07396
Fig. 26 -- Lifting Unit with Sling
Mounting Unit on Wall
The units can also be mounted on the wall using the accessory
mounting kit.
Complete Outdoor Refrigerant Connections
Follow the following general guidelines:
1. Use refrigerant grade field – supplied tubing.
Refer to Table 10 for the correct line sizes.
2. Do not use less than 10 ft (93.05 m) of interconnecting tub-
ing.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If any section of pipe is buried, there must be a 6 in. (152.4
mm) vertical rise to the valve connections on the outdoor
unit. If more than the recommended length is buried,
refrigerant may migrate to cooler, buried section during
extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start--up.
When more than 80 ft (24.4 m) of interconnecting tubing is used,
consult the Residential Long Line Application Guide for required
accessories.
3. Insulate both lines. A minimum of 1/2 inch foam pipe insu-
lation is recommended.
4. Run the refrigerant tubes as directly as possible and avoid
unnecessary turns and bends.
5. Suspend refrigerant tubes to avoid damage to insulation or
tubes so they do not transmit vibration to the structure.
6. When passing refrigerant tubes through the wall, seal the
opening so rain and insects do not enter the structure. Leave
some slack in refrigerant tubes between structure and out-
door unit to absorb vibration.
Connection at Outdoor Unit
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
To prevent damage to unit or service valves observe the
following:
SA brazing shield MUST be used.
SWrap service valves with wet cloth or use a heat sink
material.
24AHA4/124ANS Units:
1. Assemble the connector tube to the factory supplied filter
drier by:
a. Braze the field supplied connector to the inlet of the
filter drier (see Fig. 27).
A09536
Fig. 27 -- Cooling Only Connector Tube Assembly
2. Braze the completed filter drier assembly to the liquid ser-
vice valve.
3. Connect the field supplied line set to the filter drier assem-
bly and the suction valve. A sweat connection is required at
the suction valve and flare connection is required for the
mixed phase line.
4. Insulate any exposed areas between the line set and the liq-
uid valve.
25HHA4/224ANS Units
1. Assemble the connector tubes to the factory supplied filter
drier by brazing the factory supplied flare connectors to the
inlet and outlet for the filter drier (see Fig. 28).
A09537
Fig. 28 -- Heat Pump Connector Tube Assembly
2. Remove the plastic cap from the liquid and suction service
valve on the heat pump outdoor unit and assemble the heating
piston and piston cap supplied with the outdoor unit as shown
in Fig. 29.

14
*
A07407
Fig. 29 -- Accurator (bypass type)
Metering Device Components
NOTE:The Teflon seal on the piston should point towards the
liquid service valve. The size of the factory supplied piston might
have to be adjusted for long line applications (over 80 ft /24.4 m).
Refer to the Residential Long Line Application Guide for
additional information.
3. Attach the flare end of the filter drier assembly to the piston
cap (see Fig. 28).
4. Connect the field supplied line set to the filter drier assem-
bly and to the suction valve.
5. Insulate any exposed areas between filter drier and liquid
valve.
Complete Outdoor Power and Control Wiring
!WARNING
Failure to follow this warning could result in personal injury or
death.
The unit cabinet must have an uninterrupted or unbroken ground
to minimize personal injury if an electrical fault should occur. The
ground may consist of electrical wire or metal conduit when
installed in accordance with existing electrical codes.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation could void
any applicable manufacturer warranty.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before performing service or maintenance, be sure indoor
unit main power switch is turned OFF and indoor blower has
stopped.
Lock out and tag switch with a suitable warning label.
Power Wiring
NOTE: The indoor and outdoor units are powered separately.
1. Mount indoor and outdoor power disconnect. The units are
factory wired for the voltage shown on the unit nameplates.
The fused disconnect switch must be provided within sight of
the unit, readily accessible, but out of reach of children. Provi-
sions for locking the disconnect switch on the OFF (open) po-
sition is advisable. The disconnect switch must comply with
NEC and local codes. Protect the unit and wiring using only
the recommended fuse/circuit breaker size (see Tables 17 thru
20).
2. Run power wiring from electric panel to disconnect per
NEC and local codes.
3. Run power wiring from the disconnect switch to indoor and
outdoor units. Use only minimum 75_C copper conductors
between the disconnect switch and the unit for field power
connection.
4. Route the field power wires through the conduit connection
opening in the unit side panel and connect in junction box
as shown in Fig 30 for outdoor units and the strain relief
bracket section for indoor units. The units and power wiring
must be grounded.
BLK
BLK
SINGLE-PHASE UNIT
GROUNDING LUG
SINGLE-PHASE
CONN TO
DISCONNECT
PER NEC
BLK
BLU
YEL
GROUNDING LUG
THREE-PHASE
CONN TO
DISCONNECT
PER NEC
THREE-PHASE UNIT
GROUND LEAD
GROUND LEAD
LEGEND
NEC -- National Electrical Code
-- Splice (field)
Field Wiring
Factory Wiring
A08251
Fig. 30 -- Line Power Connections
NOTE:Operating unit on improper line voltage constitutes
abuse and may affect the manufacturer’s warranty. DO NOT
install unit in a system where voltage may fluctuate above or
below permissible limits.
Control Wiring
Thermostat wires should be used for control wiring between the
indoor and outdoor units. A two conductor cable is required for the
cooling only units and a four conductor cable is required for heat
pumps. 18 AWG is recommended for lengths up to 50 ft. (15 m.),
and 16 AWG is recommended between lengths of 50 ft. (15 m.) to
100 ft. (30 m.).
The control circuit is 24 volts AC (minimum 40VA) supplied from
the indoor unit.
1. Make sure you have enough control wires to cover the dis-
tance between the indoor and outdoor unit.
2. Route one end of the control wiring through the opening
provided in the unit side panel and connect to the control
terminal strip using either Fig. 31 for AC units or Fig. 32
for Heat Pump Units.

15
A150280
Fig. 31 -- 40MKCB**C/24AHA4 or 124ANS Connecting
Diagram
A150282
Fig. 32 -- 40MKQB**C/25HHA4 or 224ANS Connecting
Diagram
Strain Relief Bracket for Indoor Units
A strain relief is included within the indoor unit’s packaging. This
is required to be installed. The strain relief bracket and location to
where this should be affixed on the unit’s body is shown in Fig 33
and 34.
A150303
Fig. 33 -- Strain Relief Bracket
A150304
Fig. 34 -- Strain Relief Bracket Affixed to Cassette Body

16
ELECTRICAL DATA
Table 17 – 24AHA4/124ANS Electrical Data
Unit Size --
voltage series V/PH OPER VOLTS* COMPR FAN MCA
MAX FUSE**
or CKT BRK
AMPS
MAX MIN LRA RLA FLA
18--30
208/230/1 253 197
56.3 9.0 0.50 11.8 20
24--30 62.9 10.9 0.50 14.1 25
30--30 73.0 14.1 0.70 18.3 30
36--30 77.0 14.1 1.20 18.8 30
36--50 208/230/1 253 197 71.0 9.0 1.20 12.5 20
36--60 460/3 506 414 38.0 5.6 0.60 7.6 15
Table 18 – 25HHA4/224ANS Electrical Data
Unit Size
Voltage Series V/PH OPER VOLTS COMP FAN MCA
MAX FUSE**
or CKT BRK
AMPS
MAX MIN LRA RLA FLA
24--30
208/230/1 253 197
58.3 12.8 0.50 16.5 25
30--30 64.0 12.8 1.20 17.2 30
36--30 77.0 14.2 1.20 19.0 30
36--50 208/230/3 253 197 71.0 9.3 1.20 12.8 20
36--60 460/3 506 414 38.0 5.6 0.60 7.6 15
Table 19 – 40MKCB**C Electrical Data
Indoor Unit Size
BTU/Hr V--Ph--Hz
Voltage Range Fan Power
Min (V) Max (V) FLA (A) MinCktAmp(A) Max Fuse CB Amp
(A)
18K 208–230 -- 1 -- 60 187 253 0.332 115
24K – 34K 208–230 -- 1 -- 60 187 253 0.8 115
Table 20 – 40MKQB**C Electrical Data
Indoor Unit Size
BTU/Hr V--Ph--Hz
Voltage Range Fan Power
Min (V) Max (V) FLA (A) Min Ckt Amp (A) Max Fuse CB Amp
(A)
24K – 34K 208–230 -- 1 -- 60 187 253 0.8 115
LEGEND
FLA --- F u l l L o a d A m p s
H A C R --- Heating, Air Conditioning, Refrigeration
L R A --- Locked Rotor Amps
N E C --- National Electrical Code
RLA--- RatedLoadAmps(compressor)
*Permissible limits of the voltage range at which the unit will operate satisfactorily
**T i m e --- D e l a y f u s e .
Complies with 2007 requirements of ASHRAE Standards 90.1

17
CN 23
To C C M
Comm.Bus
XYE
FAN
10
JR6
JR6
Ma gne tism link
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0~15
32~47
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
16~31
48~63
Y
C
Notes:
1.To be wire d in acc ordance with Na tional
Electric N.E.C. and lo cal code s.
2.Use C opper c onductors only.
Use con ductors suitable for at le ast 75*C (167*F) .
3. If any of the o riginal wires, as supplie d
must be replace d, use t he sam e or equ ivalent w ire.
Legend:
................Model sp ecic fe ature
CN 1:
CN 17:
CN111 :Comp ressor si gnal
CN 8: Fa n
CN 6: Co nnectors
Live wire L1/Null line L2
Null line C
interface
interface
CN 33: R emote a larm inte rface
CN 23: R emote sw itch interface
CN 13: P ump interface
CN 14: S wing motor inter face
CN 5: Wa ter level switch in terface
CN 10: D isplay bo ard inter face
CN 3: Ce ntralized control system Interface
P 1 :Mag netism li nk interfa ce
CN 15: M otor interface
T1: Room tempera ture sen sor
T2: Pipe tempera ture sen sor
XT1:3 po le terminal block
XT 2: 5 p ole term inal bloc k
Fig. 35 -- 40MKCB**C wiring diagram
C
OUTDOOR UNIT SCHEMATIC DIAGRAM
Fig. 36 -- 24AHA4/124ANS Wiring Diagram

18
CN 23
To C C M
Comm.Bus
XYE
FAN
10
JR6
JR6
Ma gne tism link
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0~15
32~47
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
0
8
4
1
2
3
5
6
7
C
9
A
B
D
E
F
16~31
48~63
Y
C
R
O
Legend:
................Model sp ecic fea ture
CN 1:
CN 17:
CN111 :
CN 8:New fan
CN 6: Co nnectors
Live wire L1/Null l ine L2
Controls 24V sign al interfac e(R/C)
Signal in terface(Y /O)
interface
interface
CN 33: R emote ala rm interface
CN 23: R emote sw itch interface
CN 13: P ump interface
CN 14: S wing motor interfa ce
CN 5: Wa ter level s witch interface
CN 10: D isplay bo ard interf ace
CN 3: Ce ntralized control sy stem Inte rface
P 1 :Magn etism link interface
CN 15: M otor interface
T1: Room tempera ture sens or
T2: Pipe temperature senso r
XT1:3 po le termina l block
XT2:5 po le termin al block
Notes:
1.To be wired in accor dance w ith National
Electric N.E.C. and loca l codes.
2.Use C opper co nductors only.
Use con ductors suitable for at lea st 75*C( 167*F).
3. If any of the o riginal wires, as supplied
must be replace d, use th e same or equiv alent wir e.
Fig. 37 -- 40MKQB**C wiring diagram
OUTDOOR UNIT SCHEMATIC DIAGRAM
Fig. 38 -- 25HHA4/224ANS Wiring Diagram

19
Run Power Wiring for Indoor Unit
Be sure field wiring complies with local building codes and NEC,
and unit voltage is within limits shown in Tables 17 through 20.
Contact the local power company for correction of improper line
voltage.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation could void
any applicable manufacturer warranty.
NOTE:Use copper wire only between disconnect switch(es)
and unit.
NOTE:Install a branch circuit disconnect of adequate size to
handle the unit starting current per NEC. Locate the
disconnect within sight of, and readily accessible to the unit,
per section 440--14 of NEC. Some codes allow the indoor unit
to share a disconnect with the outdoor unit if the disconnect
can be locked; check local codes before installing in this
manner.
The 40MKCB**C and 40MKQB**C units require their own
power supply.
1. Locate the indoor power supply.
2. Locate and install disconnect switch per NEC and local
codes.
3. Run power supply wiring to disconnect switch.
4. Run power wiring from disconnect switch to the cassette
control box. Use copper wire only.
5. If any accessories are being installed, refer to the individual
accessory instructions for guidance on wire routing at this
time.
Install All Power, Interconnecting Wiring, Piping and
Drain Hose to Indoor Unit
1. Run the control wiring from the outdoor unit through the
access hole in the wall and make sure you have enough wire
to reach the control box of the unit once hung from the sus-
pension bolts.
2. Complete all refrigerant piping connections.
a. Cut the extreme end of the tubes and remove any
copper shavings with a deburring blade.
b. Remove the flare nut from the “Flare” connection body
of the indoor unit and insert them into the pipes.
c. Make the flares to the pipe ends with the proper flaring
tool. The flare end must not have any burrs or
imperfections. The flared walls must be uniform (see
Fig. 39 and Fig. 40).
A01799
Fig. 39 -- Removing Burrs
L
L
A07200
Fig. 40 -- Flared Walls as Equal
3. It is recommended that flare connections be located on the
outside of the wall where the indoor unit is to be mounted. If
an extension pipe is required to facilitate this location, measure,
fabricate and install the extension pipes to the indoor unit
before hanging the unit.
4. If piping connections are on the outside wall, pass the pipes
(refrigerant and drain) through the wall sleeve. Support the
unit away from the bottom using a tool or a piece of wood.
2
3
2
3
A08364
Fig. 41 -- Location of Piping, Hose, and Wiring
5. Route the power and control wiring through the back side
of the unit and to the control box area. If the wired remote is
to be used, perform any modifications required at this time.
Refer to the Accessory installation instructions.

20
6. Remove the control box cover and finish all indoor unit
wiring connections as shown on the wiring diagram or in
the accessory installation instructions. Replace the control
box cover.
7. Lubricate the end of the pipe and thread of the flare connec-
tion with refrigerant oil. Tighten by hand and then use two
wrenches (see Fig. 42) to tighten all connections.
Adjustable wrench or torque wrench
Outdoor end
Indoor end
3
1
2
A07201
Fig. 42 -- Tightening Connections
START--UP
Preliminary Checks
1. Check condensate drainage system; on the opposite side of
the drain connection, insert a water bottle up into the fan
coil unit and fill the drain pan. Water must flow steadily; if
not, check the pipe slope or inspect for any pipe restrictions.
2. Make sure all wiring connections are correct and they are
tight.
3. Field electrical power source must agree with unit name
plate rating.
4. Check that all barriers, covers, and panels are in place. En-
sure that the filters and return--air grilles on the indoor unit
have been installed and that the discharge louvers are posi-
tioned correctly.
5. All service valves must be closed.
6. On units with crankcase heaters, ensure belly--band heaters
are tight around the compressor.
Evacuate and Dehydrate the System
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Never use the system compressor as a vacuum pump.
Using Vacuum Pump
1. Completely tighten flare nuts A, B, C, D, connect manifold
gage charge hose to a charge port of the low side service
valve (see Fig. 43).
2. Connect charge hose to vacuum pump.
3. Fully open the low side of manifold gage (see Fig. 44).
4. Start vacuum pump
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for up
to 25 ft. (8 m) of line length. For refrigerant lines longer than
25 ft (8 m), add charge up to the maximum allowable length
as specified in the Residential Long Line Application Guide.
8. Disconnect charge hose from charge connection of the low
side service valve.
9. Fully open service valves B and A.
10. Securely tighten caps of service valves.
Outdoor Unit Indoor Uni
t
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 43 -- Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 44 -- Manifold
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water (see Fig. 45).
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
A95424
Fig. 45 -- Deep Vacuum Graph