Carrier 38GXM series Operation manual

Product Data
38GXM / 40GXM
Multi---Split High---Wall Duct Free Split System
38GXM --- Size 18k, 24k, and 30k
40GXM --- Size 9k, 12k, and 18k
NOTE: Read the entire instruction manual before starting the installation.
38GXM
40GXM
INDUSTRY LEADING
FEATURES / BENEFITS
AN INEXPENSIVE AND CREATIVE
SOLUTION TO DESIGN PROBLEMS.
The 38GXM/40GXM duct free inverter driven multi split system
provides individual comfort control for up to 4 separate zones.
One, two, three or four space--saving High Wall duct free fan coils
are matched with one outdoor heat pump. The indoor fan coils are
connected to the outdoor unit by refrigerant tubing and wires.
The fan coils are mounted on the wall, near the ceiling. This
selection of fan coils permits inexpensive and creative solutions to
design problems such as:
SWhen adding air conditioning to spaces that are heated
by hydronic or electric heat and have no ductwork.
SHistorical renovations or any application where
preserving the look of the original structure is essential.
SCommercial add--on jobs where the existing air
conditioning system cannot be stretched.
These compact indoor fan coil units take up very little space in the
room and do not obstruct windows. The fan coils are attractively
styled to blend with most room decors.
Advanced system components incorporate innovative technology
to provide reliable cooling and heating performance at low sound
levels.

2
INVERTER TECHNOLOGY -- COMFORT
The inverter driven compressor is designed to run at various input
power frequencies (Hz) which controls the motor speed of the
compressor.
Even Temperature – The control package, including the inverter,
monitors outdoor and indoor temperatures as they relate to the
selected indoor set point and adjusts the speed of the compressor to
match the load and keep the system operating continuously rather
than cycling and creating temperature swings. This translates to
higher comfort levels for the occupants.
Rapid Pull Down/Warm--Up – Comfort is increased by the
ability to the inverter system to ramp up the compressor speed
enabling the system to reach the user selected room temperature set
point quicker.
Humidity Control – Running the system for longer periods and
continuously varying the compressor speed will enhance the
humidity control.
INDIVIDUAL ROOM COMFORT
Maximum comfort is provided because each space can be
controlled individually based on the usage pattern. The air sweep
feature provided permits optimal room mixing to eliminate hot and
cold spots for the occupant comfort.
LOW SOUND LEVELS
When noise is a concern, the duct free split systems are the answer.
The indoor units are whisper quiet. There are no compressors
indoors, either in the conditioned space or directly over it, and
there is none of the noise usually generated by air being forced
through ductwork.
When sound ordinances and proximity to neighbors demand quiet
operation, the 38GXM unit is the right choice. With the inverter
technology, these units run at lower speeds most of the time
resulting in reduced sound levels.
INVERTER TECHNOLOGY – ENHANCED
ECONOMICAL OPERATION
Duct free systems are inherently economical to operate. Individual
rooms are heated or cooled only when required, and since the air is
delivered directly to the space, there is no need to use additional
energy to move the air in the ductwork. This economical operation
is enhanced further when the inverter system output matches the
load resulting in a more efficient system.
EASY--TO--USE CONTROLS
The high--wall systems have microprocessor--based controls to
provide the ultimate in comfort and efficiency. The user friendly
wireless remote control provides the interface between the user and
the unit.
SECURE OPERATION
If security is an issue, outdoor and indoor units are connected only
by refrigerant piping and wiring to prevent intruders from crawling
through ductwork or wall openings. In addition since the 38GXM
can be installed close to an outside wall, coils are protected from
vandals and severe weather.
FAST INSTALLATION
This compact duct--free split system is simple to install. A
mounting bracket is included with the indoor units and only wires
and piping need to be run between the indoor and outdoor units.
These units are fast and easy to install ensuring minimal disruption
to customers in homes or workplace. This makes the 38/40GXM
systems the equipment of choice for retrofit applications.
SIMPLE SERVICING AND
MAINTENANCE
Removing the top panel of the outdoor unit provides immediate
access to the control compartment, providing the service technician
access to the diagnostic LEDs to facilitate the troubleshooting
process. In addition, the draw--thru design of the outdoor unit
means that dirt accumulates on the outside surface of the coil. Coils
can be cleaned quickly from the inside using a pressure hose and
detergent.
On the indoor units, service and maintenance expense is reduced
due to the permanent easy to clean filters. Also, error codes are
displayed on the front panel to alert the user to certain system
malfunctions
BUILT--IN RELIABILITY
Duct--free split system indoor and outdoor units are designed to
provide years of trouble--free operation.
Both the indoor and outdoor units are well protected. Whenever
the microprocessor detects abnormal conditions, the unit will stop
and an error code is displayed.
Inverter systems provide additional reliability due to soft start. This
refers to the ability of the inverter to start the compressor motor
using reduced voltage and reduced current. This feature is
beneficial from an electrical standpoint (eliminates current spikes)
as well as an overall reliability standpoint due to reduced stress on
all associated system components.
ACCESSORIES
A condensate pump accessory is available to provide installation
flexibility for those applications where gravity cannot be used to
dispose of the condensate.
AGENCY LISTINGS
All systems are listed with AHRI (Air conditioning, Heating, and
Refrigeration Institute) and are ETL certified per UL 1995
standard.
38/40GXM

3
MODEL NUMBER NOMENCLATURE
OUTDOOR UNIT
38 GXM 301
---
018
Outdoor Unit
INDOOR UNIT
40 GXM 301
---
009
Fan Coil Unit
Unit Type
GXM --- M u l t i H i gh Wa l l
Voltage
3--- 208/230---1 ---60
Nominal Capacity
009 --- 3 / 4 To n
012 --- 1 To n
018 --- 1 --- 1 / 2 To n
Unit Type
GXM --- H e a t P u m p
Nominal Capacity
018 --- 1 --- 1 / 2 To n s
024 --- 2 To n s
030 --- 2 --- 1 / 2 To n s
Voltage
3--- 208/230---1 ---60
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.
38/40GXM

4
STANDARD FEATURES AND ACCESSORIES
Ease of Installation
Mounting Bracket S
Low Voltage Controls S
Comfort Features
Microprocessor Control S
Wireless Remote Control S
Rapid Cooling and Heating S
Automatic Air Sweep S
Cold Blow Prevention S
Continuous Fan S
Auto Restart Function S
Auto Changeover S
Energy Saving Features
Inverter Driven Compressor S
Sleep Mode S
24 Hour Stop/Start Timer S
Safety And Reliability
Indoor Unit Freeze Protection S
3MinuteCompressorTimeDelay S
High Compressor Discharge Temperature S
Low Voltage Protection S
Compressor Overload Protection S
Compressor Over Current Protection S
IPM Module Protection S
Ease of Service
Cleanable Filters S
Diagnostic LED’s On Outdoor Board S
Error Messages Displayed On Front Panel S
Application Flexibility
Condensate Pumps A
Standard Warranty
6 Years Compressor limited Warranty* S
2 year Parts Limited Warranty* S
Extended Warranty
6 --- 1 0 Ye a r C o m p r e s s o r O n l y O
2 --- 6 Ye a r Pa r t s O n l y O
2 --- 6 Ye a r Pa r t s ; 1 --- 6 Ye a r L a b o r O
2 --- 6 Ye a r Pa r t s ; 6 --- 1 0 Y r C o m p r. O n l y ; 1 --- 6 Y r L a b o r O
Legend
SStandard
AAccessory
OOptional
FField Fabricated
*For Residential applications. For Commercial applications, warranty is 1
year for parts and 5 years for compressor.
INDOOR UNITS
A07892
Fig. 1 – Condensate Pump Accessory
On high wall fan coils, the condensate pump accessory is
recommended when adequate drain line pitch cannot be provided,
or when the condensate must move up to exit.
The pump has a lift capability of 12 ft (3.6 m) on the discharge side
if the pump is mounted in the fan coil or 6 ft (1.8 m) on the suction
side if the pump is remote mounted.
AHRI* CAPACITY RATINGS
Model Numbers Cooling High Heating 47° F Low Heating 17° F
Outdoor Unit Indoor Unit Capacity
(Btuh) EER SEER Capacity (Btuh) HSPF Capacity (Btuh)
3 8 G X M 2 1 8 --- --- --- 3 2 x 4 0 G X M 0 0 9 --- --- --- 3 16,500 8.9 14.0 18,000 7.9 12,000
3 8 G X M 2 2 4 --- --- --- 3 2 x 4 0 G X M 0 1 2 --- --- --- 3 24,000 9.6 14.5 27,000 8.3 17,065
3 8 G X M 4 3 0 --- --- --- 3 4 x 4 0 G X M 0 0 9 --- --- --- 3 26,000 8.0 14.5 28,000 8.4 17,350
*Air Conditioning, Heating & Refrigeration Institute
--- --- = N / A
Legend
HSPF --- Heating Seasonal Performance Factor
SEER --- Seasonal Energy Efficiency Ratio
NOTES:
1. Ratings are net values reflecting the effects of circulating fan heat. Ratings are based on: Cooling Standard: 80_F (26.67_C) db, 67_F (19.44_C) wb air
entering indoor unit and 95_F(35_C) db air entering outdoor unit. High Temperature Heating Standard: 70_F (21.11_C) db air entering indoor unit and 47_F
(8.33_C) db, 43_F (6.11_C) wb air entering outdoor unit.
2. Ratings are based on 25 ft. (7.62 m) of interconnecting refrigerant lines.
3. All system ratings are based on fan coil units operating at high fan speed. Consult Physical Data tables for air flows at all available fan speeds.
38/40GXM

5
DIMENSIONS -- INDOOR
H
D
W
A08289
Unit Size W
In. (mm)
H
In. (mm)
D
In. (mm)
Net Operating Weight
Lbs. (Kg)
9k 30.3 (770) 9.8 (249) 7.84 (199) 18.7 (8.5)
12k 32.7 (831) 11.2 (284) 8.9 (226) 24.2 (11)
18k 40.2 (1021) 12.2 (310) 9.0 (229) 28.6 (13)
DIMENSIONS -- OUTDOOR
WD
H
A08290
Unit Size W
In. (mm)
D
In. (mm)
H
In. (mm)
Net Operating Weight
Lbs. (Kg)
18k 33.3 (846) 11.8 (300) 27.0 (685) 114.4 (52)
24k 37.4 (950) 16.5 (420) 33.1 (840) 150.0 (68)
30k 37.4 (950) 16.5 (420) 33.1 (840) 165.0 (75)
38/40GXM

6
CLEARANCES -- INDOOR
6 " (0.15m ) min.
5
"
(0.13m)
min.
6'
5 "
(0.13m)
min.
(1.8m)
CEILING
FLOOR
A07891
Fig. 2 – Indoor unit clearance
CLEARANCES -- OUTDOOR
A
DB
Air-outlet
Air-inlet
C
E
A07894
UNIT 12k in. (mm)
A20 (508)
B20 (508)
C24 (610)
D12 (305)
E24 (510)
Fig. 3 – Outdoor Unit Clearance
38/40GXM

7
PHYSICAL DATA -- 38GXM
Outdoor Unit 38GXM 018 024 030
System Volatge 208/230---1 ---60
Control Voltage Low Voltage Pulse DC
Rated Cooling Capacity (Btuh) 16,500 24,000 26,000
Rated Heating Capacity (Btuh) 18,000 27,000 28,000
Operating Weight lb (kg) 114.4 (52) 150.0 (68) 165 (75)
Refrigerant Type R---410A
Metering Device EXV at Outdoor Unit
Charge lb (kg) 3.5 (1.6) 5.5 (2.5) 7.3 (3.3)
Compressor
Type Inverter Driven Rotary
Model C ---6RVN93H0V C ---7RZ233H1A
Outdoor Fan
CFM TBD TBD TBD
RPM 780/600 860/760/540
Diameter (in) …No. of Blades 18.7 …3
Watts watts 60
Outdoor Coil
Face Area (sq.ft) 5.7 6.0 7.0
No. Rows 2
No. of Circuits TBD
Fins per inch 18
Refrigerant Lines
Connection Type Flare
Liquid (Mix Phase) in OD 1/4”
Vapor Line in OD 3/8” 1/2” 3/8”
Total Piping ft. (m.) 124 (38)* 230 (70)*
Max Piping to Any FCU ft. (m.) 82 (25)
Max Lift (Fan Coil Above) ft 49 (15)
Max Drop (Fan Coil Below) ft 33 (10)
External Finish White
*Refer to Long Line Application section on page 11
38/40GXM

8
PHYSICAL DATA -- 40GXM
Indoor Unit 40GXM 009 012 018
System Voltage 208/230 ---1 ---60
Control Voltage Low Voltage Pulse DC
Electrical Connections Indoor Unit Powerd From Outdoor Unit
Rated Cooling Capacity (Btuh) 16,500 24,000 26,000
Rated Heating Capacity (Btuh) 18,000 27,000 28,000
Operating Weight lb (kg) 18.7 (8.5) 24.2 (11) 26.4 (12)
Refrigerant Type R---410A
Metering Device EXV at the outdoor unit
Moisture Removal Rate (pints/hr) TBD
Indoor Fan
RPM/CFM (Turbo) 1150/283 1250/341 1350/368
RPM/CFM (High) 1050/247 1050/288 1200/330
RPM/CFM (Medium) 900/212 950/253 1050/280
RPM/CFM (Low) 750/182 800/194 900/218
Motor Watts 14 14 14
Blower Quantity …Size in 1…3.8 x 23 1…3.6 x 24.3 1…3.8 x 31.4
Indoor Coil
Face Area (sq.ft) 2.4 2.4 3.2
No. Of Rows 2
Fins Per Inch 16 18 16
Number Of Circuits 2 3 3
Filters
Quantity 2
Controls Intergrated Microprocessor
Wireless Remote Standard
Modes Cool/Heat/Dry/Auto
Fan Mode High/Medium/Low/Auto
Emergency Mode Ye s
Defrost Method Demand Defrost
Diagnostics Ye s
Air Sweep Ye s
Soft Start Ye s
Rapid Cooling/Heating Ye s
Cold Blow Prevention Ye s
Sleep Mode Ye s
24 Hour Timer Ye s
Auto Restart Ye s
FreezeProtectionOnIndoorUnit Ye s
Refrigerant Lines
Connection Type Flare
Liquid (Mix Phase) in OD 1/4”
Vapor Line in OD 3/8” 1/2” 3/8”
Total Piping ft. (m.) 124 (38)* 230 (70)*
Max Piping to Any FCU ft. (m.) 82 (25)
Max Lift (Fan Coil Above) ft 49 (15)
Max Drop (Fan Coil Below) ft 33 (10)
Condensate Drain
Size in ID = 1/2” OD = 5/8”
External Finish White
*Refer to Long Line Application section on page 11
38/40GXM

9
APPLICATION DATA
UNIT SELECTION
When selecting a variable speed system match the system capacity
range to the anticipated load range. Since a variable speed system
can accommodate a wide range of loads it is important to
understand the percentage of time that the system will be required
to run at the both the maximum and the minimum load points. This
differential is most evident when a residential application is
compared with a commercial application.
Generally there will be more load diversification in the residential
application (shifting from low load to high load).
The commercial application will tend to be more steady during the
normal day time hours, and will go to low load levels after normal
business hours. If it is anticipated that the system will be required
to run at the maximum load point for the majority of the time, the
next larger system capacity should be selected.
The tables below are guidelines for selecting the proper size for the
application.
CAPACITIES
18K -- COOLING
Fan Coil Combinations FCU 1 BTUH FCU 2 BTUH Cooling Capacity BTUH Cooling Capacity Range BTUH
1 x 40GXM009---3 9,300 --- 9,300 4,900 --- 12,500
1 x 40GXM012---3 10,200 --- 10,200 5,100--- 12800
2 x 40GXM009---3 8,800 8,800 17,600 3,750 --- 19,600
1 x 40GXM009---3
1 x 40GXM012---3 8,500 9,800 18,300 3,450 --- 21,300
18K -- HEATING
Fan Coil Combinations FCU 1 BTUH FCU 2 BTUH Heating Capacity BTUH Heating Capacity Range BTUH
1 x 40GXM009---3 9,600 --- 9,600 3,700 --- 10,600
1 x 40GXM012---3 10,600 --- 10,600 3,900 --- 11,700
2 x 40GXM009---3 9,100 9,100 18,200 8,200 --- 19,800
1 x 40GXM009---3
1 x 40GXM012---3 9,000 10,300 19,300 8,800 --- 21,000
24K -- COOLING
Fan Coil Combinations FCU 1 BTUH FCU 2 BTUH Cooling Capacity BTUH Cooling Capacity Range BTUH
1 x 40GXM009---3 14,100 --- 14,100 12,700 --- 16,700
1 x 40GXM012---3 15,600 --- 15,600 14,200 --- 18,600
2 x 40GXM009---3 11,400 11,400 22,800 11,800 --- 25,500
1 x 40GXM009---3
1 x 40GXM012---3 11,000 13,000 24,000 12,300 --- 26,800
1 x 40GXM012---3
1 x 40GXM012---3 12,775 12,775 25,050 12,850 --- 28,000
24K -- HEATING
Fan Coil Combinations FCU 1 BTUH FCU 2 BTUH Heating Capacity BTUH Heating Capacity Range BTUH
1 x 40GXM009---3 12,900 --- 12,900 10,500 --- 15,000
1 x 40GXM012---3 14,500 --- 14,500 11,600 --- 16,800
2 x 40GXM009---3 12,100 12,100 24,200 10,100 --- 26,600
1 x 40GXM009---3
1 x 40GXM012---3 11,800 14,300 26,100 10,900 --- 28,700
1 x 40GXM012---3
1 x 40GXM012---3 14,200 14,200 28,000 11,400 --- 31,200
38/40GXM

10
CAPACITIES (CONTINUED)
30K -- COOLING
Fan Coil Combinations FCU 1
BTUH
FCU 2
BTUH
FCU 3
BTUH
FCU 4
BTUH Cooling Capacity BTUH Cooling Capacity Range BTUH
2 x 40GXM009---3 8,530 8,530 --- --- 17,600 11,200 --- 22,800
1 x 40GXM009---3
1 x 40GXM012---3 8,500 11,900 --- --- 20,400 11,200 --- 26,600
1 x 40GXM009---3
1 x 40GXM018---3 8,800 15,300 --- --- 24,100 11,200 --- 32,400
2 x 40GXM012---3 11,900 11,900 --- --- 23,800 11,200 --- 28,000
1 x 40GXM012---3
1 x 40GXM018---3 11,900 12,300 --- --- 24,200 11,200 --- 32,400
3 x 40GXM009---3 8,100 8,100 8,100 --- 24,300 11,200 --- 32,400
2 x 40GXM009---3
1 x 40GXM012---3 7,200 7,200 9,900 --- 24,300 11,200 --- 32,400
2 x 40GXM009---3
1 x 40GXM018---3 7,500 7,500 9,200 --- 24,200 11,200 --- 32,400
1 x 40GXM009---3
2 x 40GXM012---3 6,500 8,900 8,900 --- 24,300 11,200 --- 32,400
1 x 40GXM009---3
1 x 40GXM012---3
1 x 40GXM018---3
7,200 7,800 9,200 --- 24,200 11,200 --- 32,400
2 x 40GXM012---3
1 x 40GXM018---3 7,800 7,800 8,500 --- 24,100 11,200 --- 32,400
4 x 40GXM009---3 6,800 6,800 6,800 6,800 27,200 11,200 --- 32,400
3 x 40GXM009---3
1 x 40GXM012---3 6,000 6,000 6,000 9,400 27,400 11,200 --- 32,400
3 x 40GXM009---3
1 x 40GXM018---3 5,500 5,500 5,500 11,100 27,600 11,200 --- 32,400
2 x 40GXM009---3
2 x 40GXM012---3 5,100 5,100 8,500 8,500 27,200 11,200 --- 34,100
1 x 40GXM009---3
2 x 40GXM012---3
1 x 40GXM018---3
5,400 5,600 5,600 11,000 27,600 11,200 --- 34,100
4 x 40GXM012---3 6,800 6,800 6,800 6,800 27,200 11,200 --- 34,100
30K -- HEATING
Fan Coil Combinations FCU 1
BTUH
FCU 2
BTUH
FCU 3
BTUH
FCU 4
BTUH Cooling Capacity BTUH Cooling Capacity Range BTUH
2 x 40GXM009---3 10,900 10,900 --- --- 21,800 8,700 --- 28,000
1 x 40GXM009---3
1 x 40GXM012---3 10,900 13,600 --- --- 24,500 8,700 --- 29,000
1 x 40GXM009---3
1 x 40GXM018---3 9,900 17,100 --- --- 27,000 10,200 --- 31,700
1 x 40GXM012---3
1 x 40GXM012---3 13,300 13,300 --- --- 26,600 10,200 --- 31,700
1 x 40GXM012---3
1 x 40GXM018---3 12,300 15,400 --- --- 27,700 10,600 --- 33,800
3 x 40GXM009---3 9,200 9,200 9,200 --- 27,600 10,600 --- 33,800
2 x 40GXM009---3
1 x 40GXM012---3 8,500 8,500 10,600 --- 27,600 10,600 --- 33,800
2 x 40GXM009---3
1 x 40GXM018---3 8,000 8,000 11,600 --- 27,600 10,600 --- 33,800
1 x 40GXM009---3
2 x 40GXM012---3 7,500 10,400 10,400 --- 28,300 10,600 --- 33,800
1 x 40GXM009---3
1 x 40GXM012---3
1 x 40GXM018---3
7,500 9,200 10,900 --- 27,600 10,600 --- 33,800
2 x 40GXM012---3
1 x 40GXM018---3 8,500 8,500 10,600 --- 27,600 10,600 --- 33,800
4 x 40GXM009---3 8,200 8,200 8,200 8,200 32,800 11,300 --- 37,500
3 x 40GXM009---3
1 x 40GXM012---3 7,500 7,500 7,500 10,200 32,700 11,300 --- 37,500
3 x 40GXM009---3
1 x 40GXM018---3 7,200 7,200 7,200 11,200 32,800 11,300 --- 37,500
2 x 40GXM009---3
2 x 40GXM012---3 7,200 7,200 9,200 9,200 32,800 11,300 --- 37,500
1 x 40GXM009---3
2 x 40GXM012---3
1 x 40GXM018---3
7,100 8,000 8,100 10,300 33,400 11,300 --- 37,500
4 x 40GXM012---3 8,250 8,250 8,250 8,250 33,000 11,300 --- 37,500
38/40GXM

11
UNIT MOUNTING (INDOOR)
Mounting Bracket – The fan coil units are furnished with
mounting bracket to hang the unit.
Support – Adequate support must be provided to handle the
weight of all fan coils. Refer to the Physical Data section for
weights, and the base unit dimensional drawings.
Unit Leveling – For reliable operation, units should be level in all
planes.
Clearances – Minimum clearance as shown in Fig. 2.
Unit location – Select a location which will provide the best air
circulation for the room. These units should be positioned as high
as possible on the wall for the best air circulation. The unit return
and discharge should not be obstructed by furniture, curtains, or
anything which may cause the unit to short cycle or air to recycle.
Place the unit in the middle of the selected wall (if possible). Use
an outside wall, if available, to make piping easier, and place the
unit so it faces the normal location of room occupants.
UNIT MOUNTING (OUTDOOR)
Support – A location which can bear the weight of outdoor unit.
Refer to the Physical Data section for weights, and base
dimensional drawings.
Unit Leveling – For reliable operation, units should be level in all
planes.
Clearances – Minimum clearances, as shown in Fig. 3, must be
provided for airflow. The outdoor units are designed for free--blow
applications. Air inlets and outlets should not be restricted.
Unit location – A location which is convenient to installation and
not exposed to strong wind.
SYSTEM OPERATING CONDITIONS
Cooling operating range:
Maximum Minimum
DB
_F(_C)
WB
_F(_C)
DB
_F(_C)
WB
_F(_C)
Outdoor Unit 115
(46.1) --- 55 (12.8) ---
Indoor Unit 95
(35) --- 55 (12.8) ---
Heating operating range:
Maximum Minimum
DB
_F(_C)
WB
_F(_C)
DB
_F(_C)
WB
_F(_C)
Outdoor Unit 75
(23.9) --- 14 ( --- 1 0 ) ---
Indoor Unit 80
(26.7) --- 55 (12.8) ---
METERING DEVICES
The outdoor unit has multiple electronic expansion valves to
manage the refrigerant flow to the different indoor fan coils
connected to that unit.
REFRIGERANT LINES
Routing – Refrigerant lines can be routed in any of the four
directions shown in Fig. 4.
1Right Exit
2Right Rear Exit
3LeftExit
4Left Rear Exit
(a) (b)
As viewed from front
Fig. 4 – Refrigerant Line Routing
A08281
General Guidelines:
1. The 38GXM units are shipped with full charge of R--410A
refrigerant. All charges, line sizing, and capacities are based
on runs of 16 ft (9.1 m) for units sizes 18 and 24K, and 30
ft. (9.1 m.) for size 30K. For runs over the previous limits,
consult long line section for charge adjustments.
2. Refrigerant lines should not be buried in the ground. If it is
necessary to bury the lines, not more than 36 inches (914
mm) should be buried. Provide a minimum of 6 inch (152
mm) vertical rise to service valves to prevent refrigerant
migration.
3. Both lines must be insulated. Use a minimum of ½-- i n c h
(12.7 mm) thick insulation. Closed--cell insulation is
recommended in all long--line applications.
4. Special consideration should be given to isolating
interconnecting tubing from the building structure. Isolate
the tubing so that vibration or noise is not transmitted into
the structure.
Long Line Applications:
1. No change in line sizing is required.
2. For line lengths above the mentioned in the general
guidelines section, add 0.24 oz. per additional foot of piping
up to the maximum allowed.
38/40GXM

12
DRAIN CONNECTIONS
Install drains to meet the local sanitation codes. If adequate gravity
drainage cannot be provided, a field installed condensate pump
accessory should be used. The pump has a lift capability of 12 ft
(3.6 m) on the discharge side if the pump is mounted in the fan coil
or 6 ft (1.8 m) on the suction side if the pump is remote mounted.
See the Physical Data tables for drain sizes.
NOTE: The high wall fan coils have internal condensate trap.
An external trap is not required.
Drain connections may be routed through alternate locations as
showninFig.5.
Pipe holder
Pipe cover
Right piping
Left piping
Pipe cover
Right back piping
Left back piping
12
3
4
A09112
Fig. 5 – Piping Locations
WIRING
The main power is supplied to the outdoor unit. The field supplied
connecting cables from the outdoor unit to each of the indoor units
consists of 4 wires: L1, L2, Ground, and S for communication
between the outdoor unit and each indoor unit.
CONTROL SYSTEM
The 38/40GXM unit is equipped with a microprocessor controls to
operate the system and give optimum levels of comfort and
operating efficiency.
There are microprocessor boards and thermistors located in both
the indoor and outdoor units. The thermistors monitor the system
operation and control the operating mode. The change in the
settings or the modes of operation, use the factory supplied
wireless remote control.
The 38/40GXM unit has the following operating modes:
SFan Only
SAuto
SHeating (on Heat Pumps only)
SCooling
SDehumidification (Dry)
FAN ONLY -- In Fan Only mode, the system filters and circulates
the room air without changing the room air temperature.
AUTO -- In Auto mode, the system will automatically select one of
the following operating modes: cooling, heating or fan only based
on the difference between the room temperature and the set point
temperature.
HEATING -- In the Heating mode, the system heats and filters
room air.
COOLING -- When in Cooling mode, the fan runs all the time and
the system cools, dries and filters room air.
DEHUMIDIFICATION (DRY) -- in Dehumidification (Dry)
mode, the system dries, filters and slightly cools room temperature.
This mode does not take place of a dehumidifier.
In addition to the above modes that are selected by using the
remote control, the unit can run in emergency mode by using a
manual button. This mode is used when the remote is misplaced or
the batteries in the remote have died. In this mode, the unit will run
in AUTO mode with a predetermined set point (76_F/24.4_C)
WIRELESS REMOTE CONTROL
1. A wireless remote control is supplied for system operation.
2. Each battery--operated wireless remote control may be used
to control more than one unit.
3. The wireless remote control has a range of 25 ft. (7.6 m).
SEQUENCE OF OPERATION
Simultaneous heating and cooling is not allowed. At start--up, the
first indoor unit to call for operation (heating or cooling) will
control from the preset position, the mode of operation for the rest
of the indoor units connected to the same outdoor unit. If the other
units conflict in mode with the first unit an error message will be
displayed on those units.
When a unit is set to COOL, HEAT or DRY mode, the electronic
expansion valve is first initialized (closed) and then is opened to a
preset position.
Superheat heat for each fan coil (the ones that are energized) is
monitored and the position of the electronic expansion valve is
adjusted to ensure that each fan coil gets the appropriate amount of
refrigerant to maintain the required superheat. After the set point is
satisfied and the fan coil shuts off, the electronic expansion valve
stays open for a specified time to ensure that system pressures
equalize.
When the system is set for COOL, HEAT or DRY mode, the
compressor speed is varied by comparing the indoor air
temperature with the set point and continuously adjusting the
compressor speed (to keep the compressor running as long as
possible) in an effort to maintain the greatest comfort possible.
The indoor fan can be running in MANUAL or AUTO mode.
When the fan is running in AUTO mode, the speed is determined
by comparing the room temperature to the set point.
In COOLING mode, when the set point is satisfied, the fan will
continue running. In HEATING mode, when the set point is
satisfied, the fan speed will be reduced and then will run
continuously until the coil temperature drops to a point cold air is
blown on the occupants in the space, at which time the indoor fan
is de--energized.
When the unit goes through the defrost cycle, the indoor fans are
de--energized and the refrigerant is circulated through all the fan
coils (even if they were off or on standby before the defrost cycle)
to maximize the heat transfer surface area available for defrost
operation.
38/40GXM

13
AIR THROW DATA
Model Number Approximate Air Throw ft. (m)
Low Medium High Turbo
4 0 G X M 0 0 9 --- --- --- 3 20 (6.1) 22 (6.7) 25 (7.6) 28 (8.5)
4 0 G X M 0 1 2 --- --- --- 3 22 (6.7) 25 (7.6) 27 (8.2) 31 (9.4)
4 0 G X M 0 1 8 --- --- --- 3 23 (7.0) 29 (8.8) 32 (9.8) 35 (10.7)
SOUND RATINGS
Outdoor Units
Model Number Sound Power dBA Sound Pressure dBA
3 8 G X M 2 1 8 --- --- --- 3
(cool/heat) 68/68 57/57
3 8 G X M 2 2 4 --- --- --- 3
(cool/heat) 68/68 57/57
3 8 G X M 4 3 0 --- --- --- 3
(cool/heat) 70/70 59/59
Indoor Units
Model Number
Low Medium High Turbo
Sound
Power
dBA
Sound
Pressure
dBA
Sound
Power
dBA
Sound
Pressure
dBA
Sound
Power
dBA
Sound
Pressure
dBA
Sound
Power
dBA
Sound
Pressure
dBA
4 0 G X M 0 0 9 --- --- --- 3
(cool/heat) 42.0 31.0 47.0 36.0 51.0 40.0 54.0 43.0
4 0 G X M 0 1 2 --- --- --- 3
(cool/heat) 44.0 33.0 46.0 35.0 48.0 47.0 53.0 42.0
4 0 G X M 0 1 8 --- --- --- 3
(cool/heat) 52.0 41.0 55.0 44.0 57.0 46.0 60.0 49.0
NOTES:
1. Sound power ratings are per AHRI 270 and AHRI 350
2. Sound pressure ratings are estimated sound pressure, 3 feet (.91 m) from the unit, based on sound power data.
ELECTRICAL DATA
UNIT
SIZE
SYSTEM
VOLTAGE
OPERATING
VOLTAGE* COMPRESSOR OUTDOOR FAN INDOOR FAN{MCA
MAX
FUSE/CB
AMP
V O L T --- P H --- H Z MAX/MIN RLA LRA FLA HP WVOLTS FLA HP W
18 K
208/230---1 ---60 253/187
3.8 41 0.65 0.082 60 208/230---1 ---60 0.26 0.19 14 14 20
24 K 8.2 34 20 30
30 K 0.68 24 40
* Permissible limits of the voltage range at which the unit will operate satisfactorily
{Indoor fan powered from outdoor unit.
LEGEND
FLA --- F u l l L o a d A m p s
LRA --- L o c k e d R o t o r A m p s
MCA --- Minimum Circuit Amps
RLA --- RatedLoadAmps
38/40GXM

14
GUIDE SPECIFICATIONS
HORIZONTAL DISCHARGE OUTDOOR UNITS
Size Range:1--1/2, 2, and 2--1/2 Ton Nominal Cooling and Heating Capacity
Carrier Model Number: 38GXM
PART1–GENERAL
1.01 System Description
A. Outdoor air--cooled split system compressor sections suitable
for on--the--ground, rooftop, wall hung or balcony mounting.
Units shall consist of a variable speed rotary compressor, an
air--cooled coil, propeller--type draw--through outdoor fan,
reversing valve, accumulator, electronic expansion valves,
multiple service valves, and controls that allows multiple
indoor units to be connected to the outdoor unit. Units shall
discharge horizontally as shown on the contract drawings.
Units shall function as the outdoor component of an air--to--air
heat pump system.
B. Units shall be used in a refrigeration circuit matched to one,
two, three or four High Wall duct--free heat pump fan coil
units.
1.02 Agency Listings
A. Unit construction shall comply with ANSI/ASHRAE 15, latest
revision, and with NEC.\
B. Units shall be evaluated in accordance with UL standard 1995.
C. Units shall be listed in CEC directory.
D. Unit cabinet shall be capable of withstanding 500-hour salt
spray test per Federal Test Standard no. 141 (method 6061).
E. Air-cooled condenser coils shall be leak tested at 573 psig.
1.03 Delivery, Storage, And Handling
Units shall be shipped in one piece and shall be stored and handled
per manufacturer’s recommendations.
1.04 Warranty (For Inclusion By Specifying
Engineer)
PART 2 – PRODUCTS
2.01 Equipment
A. General:
Factory assembled, single piece, air-cooled outdoor unit. Contained
within the enclosure shall be all factory wiring, piping, controls,
and compressor.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel,
bonderized and coated with baked-enamel finish on inside
and outside.
2. Unit access panel should be removable with minimal screws
and shall provide full access to the compressor, fan, and
control components.
3. Outdoor compartment shall be isolated and have an acoustic
lining to assure quiet operation.
C. Fans:
1. Outdoor fans shall be direct-drive propeller type, and shall
discharge air horizontally. Fan shall draw air through the
outdoor coil.
2. Outdoor fan motors shall be multi--speed, totally-enclosed,
single phase motors with permanently lubricated ball
bearings. Motor shall be protected by internal thermal
overload protection.
3. Shaft shall have inherent corrosion resistance.
4. Outdoor fan openings shall be equipped with PVC
metal/mesh coated protection grille over fan.
D. Compressor
1. Compressor shall be fully hermetic variable speed rotary
type.
2. Compressor shall be three phase, inverter driven.
3. Compressor shall be equipped with oil system, operating oil
charge, and motor.
4. Motor shall be suitable for operation in refrigerant and oil
atmosphere.
5. Compressor assembly shall be installed on rubber vibration
isolators.
6. The inverter and compressor shall be protected against over
temperature and over current.
E. Outdoor Coil:
Coil shall be constructed of Aluminum fins mechanically bonded
to seamless copper tubes, which are cleaned, dehydrated and
sealed.
F. Refrigerant Components:
Refrigerant circuit components shall include multiple brass external
liquid line service valves with service gauge port connections,
multiple suction line service valves with service gage connection
port, accumulator, reversing valve, electronic expansion valves.
G. Safeties:
Operating safeties shall be factory selected, assembled, and tested.
The minimum functions shall include the following:
1. Compressor discharge over temperature protection.
2. System low voltage protection.
3. Compressor overload protection.
4. Compressor over current protection.
5. IPM module protection.
H. Electrical Requirements:
1. Units shall operate on single-phase, 60 Hz power at
208/230 v.
2. Unit electrical power shall be a single point connection.
3. All power and control wiring must be installed per NEC
and all local electrical codes.
4. Units shall have multiple terminal blocks to connect to
multiple indoor units.
38/40GXM

15
GUIDE SPECIFICATIONS
INDOOR WALL--MOUNTED DUCT--FREE UNITS
Size Range: 3/4, 1 and 1--1/2 Ton Nominal Cooling and Heating Capacity
Carrier Model Number: 40GXM
PART1–GENERAL
1.01 System Description
Indoor, wall-mounted, direct expansion fan coils are matched with
heat pump outdoor units.
1.02 Agency Listings
Unit shall be rated per AHRI Standards 210/240 and listed in the
AHRI directory as a matched system.
1.03 Delivery, Storage, And Handling
Units shall be shipped in one piece and shall be stored and handled
per manufacturer’s recommendations.
1.04 Warranty (For Inclusion By Specifying
Engineer)
PART 2 – PRODUCTS
2.01 Equipment
A. General:
Indoor, direct-expansion, wall-mounted fan coil. Unit shall be
complete with cooling/heating coil, fan, fan motor, piping
connectors, electrical controls, microprocessor control system, and
integral temperature sensing. Unit shall be furnished with integral
wall mounting bracket and mounting hardware.
B. Unit Cabinet:
Cabinet discharge and inlet grilles shall be attractively styled,
high-impact polystyrene. Cabinet shall be fully insulated for
improved thermal acoustic performance.
C. Fans:
1. Fan shall be tangential direct-drive blower type with air
intake at the top of the unit and discharge at the bottom
front. Automatic, motor-driven vertical air sweep shall be
provided standard.
2. Air sweep operation shall be useable selectable. The vertical
sweep may be adjusted (using the remote control) and the
horizontal air direction maybe be set manually.
D. Coil:
Coil shall be copper tube with aluminum fins and galvanized steel
tube sheets. Fins shall be bonded to the tubes by mechanical
expansion. A drip pan under the coil shall have a drain connection
for hose attachment to remove condensate. Condensate pan shall
have internal trap.
E. Motors:
Motors shall be totally enclosed, permanently lubricated ball
bearing with inherent overload protection. Fan motors shall be
4--speed.
F. Controls:
Controls shall consist of a microprocessor-based control system
which shall control space temperature, determine optimum fan
speed, and run self diagnostics. The temperature control range shall
be from 62_Fto84_F (16.7_C to 28.9_C).
The unit shall have the following functions as a minimum:
1. Automatic restart after power failure at the same operating
conditions as at failure.
2. A timer function to provide a minimum 24-hour timer cycle
for system Auto Start/Stop.
3. Temperature sensing control to enter set points and
operating conditions.
4. Wireless infrared remote control to enter set points and
operating conditions.
5. Automatic air sweep control to provide on or off activation
of air sweep louvers.
6. Dehumidification mode shall provide increased latent
removal capability by modulating system operation and set
point temperature.
7. Fan-only operation to provide room air circulation when no
cooling is required.
8. Diagnostics shall provide continuous checks of unit
operation and warn of possible malfunctions. Error
messages shall be displayed at the unit.
9. Fan speed control shall be user-selectable: high, medium,
low or microprocessor controlled automatic operation
during all operating modes.
10. Cold blow prevention control to ensure that cold air is not
blown into the occupied space after the compressor is
de--energized in the heating cycle.
The unit shall be protected against the following:
1. Indoor coil freeze up
2. Indoor coil high temperature protection shall be provided to
detect excessive indoor discharge temperature when unit is
in heat pump mode.
G. Filters:
Units shall have filter track with factory-supplied cleanable filters.
H. Electrical Requirements:
Indoor fan motor to operate at 208/230 volts. Power is supplied
from the indoor unit.
I. Operating Characteristics:
The 40GXM system shall have a minimum listed SEER (seasonal
energy efficiency ratio) of up to 14.5 SEER at AHRI conditions,
and HSPF of up to 8.4.
J. Refrigerant Lines:
All units should have refrigerant line connections that can be
oriented to connect from the left, right, or back of unit. Both
refrigerant lines need to be insulated (on heat pump units).
K. Special Features (Field Installed):
1. Condensate Pump: The condensate pump shall remove
condensate from the drain pan when gravity drainage
cannot be used. Pump shall be designed for quiet operation.
Pump shall consist of two parts: an internal reservoir/sensor
assembly, and a remote sound-shielded pump assembly. A
liquid level sensor in the reservoir shall stop cooling
operation if the liquid level in the reservoir is unacceptable.
38/40GXM

16
Copyright 2010 Carrier Corp. S7310 W. Morris St. SIndianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No. 38---40GXM---1PD
Replaces: New
Printed in U.S.A. Edition Date: 03/10
38/40GXM