Ceiling-Suspended Fan Coil Units
Installation, Start-Up
and Service Instructions
40QA024-060
CONTENTS
Page
SAFETY CONSIDERATIONS ................. 1
INSTALLATION ............................1-13
Step 1 − Complete Pre-Installation Checks ...3
• UNPACK UNIT
• INSPECT SHIPMENT
• BEFORE INSTALLATION
Step 2 − Select Location ....................4
Step 3 − Mount Unit ........................6
• TO MOUNT UNIT
• TO INSTALL REMOTE THERMOSTAT
Step 4 − Connect Refrigerant Piping ........7
Step 5 − Connect Condensate Drain Line ...10
Step 6 − Make Electrical Connections ......11
Step 7 − Install Remote Thermostat ........12
Step 8 — Make Connections Between
Indoor and Outdoor Units ................12
• COOLING ONLY SYSTEMS
• HEAT PUMP SYSTEMS
START-UP ...............................13-15
After Extended Shutdown ..................13
Seasonal Changeovers .....................13
Adjusting Airflow ..........................14
Operating Mode Memory ...................14
Automatic Operation (Auto.) Mode ..........14
Operating Sequence .......................14
• FAN OPERATION
• COOLING MODE OPERATION
• HEAT PUMP OPERATION (40QAE ONLY)
• DEFROST (40QAE ONLY)
• SYSTEM SAFETIES
• SPECIAL OPERATION, HEATING
CLEANING AND MAINTENANCE ...........15,16
Lubrication ................................15
To Remove and Clean or Replace
Air Filters ...............................15
• TO REMOVE AIR FILTERS
• TO CLEAN OR REPLACE FILTERS
To Clean Indoor Unit Bottom Panel .........16
To Clean Indoor Coil .......................16
To Clean Outdoor Coil (Outdoor Unit) .......16
To Clean Condensate Drains ................16
• TO CLEAN OR REPLACE DRAIN PAN
SERVICE ..................................16
Before Calling for Service ..................16
• IF SYSTEM FAILS TO OPERATE
FRESH AIR INSTALLATION OPTIONS .......16
Ventilation-Air Accessory ...................16
TROUBLESHOOTING .....................17-20
START-UP CHECKLIST ..............CL-1, CL-2
SAFETY CONSIDERATIONS
Installing and servicingair-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 safetycodes. Wearsafety glasses 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 accessory heater power if applicable. Electrical shock can cause personal injury.
INSTALLATION
The 40QAB ceiling-suspended fan coil unit (Fig. 1) is typically installed with the 38HDC or 38HDS outdoor condensing unit, and the 40QAE unit is typically installed with the
38QRC heat pump.
NOTE: The 40QAE unit can also be installed with either the
38HDC or HDS condensing units. Refer to Table 1 to make
sure the correct indoor unit(s) is installed with the correct
outdoor unit.
Installation instructions for 40QA fan coil units are contained in this manual. Refer to this manual for proper installation of the complete system. Note that the outdoor units
are shipped with installation and service instructions for basic installation of the outdoor section. Be sure to make the
connections in Cooling-Only Systems and Heat Pump Systems sections on page 12 of this literature so that the unit
will operate properly with the 40QA mircoprocessor control
system.
Fig. 1 — 40QA Ceiling-Suspended 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 3d 2d
PC 111 Catalog No. 534-052 Printed in U.S.A. Form 40QA-3SI Pg 1 4-96 Replaces: 40QA-1SI
Table 1 — Acceptable System Combinations for Indoor and Outdoor Units
OUTDOOR UNIT INDOOR UNIT
Type Model Number 38 Type Model Number 40QA
HDC018
HDC024 B024
HDC030 B036
HDC036 B036
HDC048 B048
Cooling Only
Cooling Only
Multi-Split*
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
tableare those combinations which use only ceiling-suspendedunits
(not combined with any other type of fan coil unit). Refer to system
presale literature or Price Pages for more details on other system
combinations.
†Units must be field reconfigured for 1
tion. See Before Installation section on page 3 for details.
HDC060 B060
HDC018
HDC024 E024
HDC030 E036
HDC036 E036
HDC048 E048
HDC060 E060
HDS024
HDS048
HDS024
HDS048
QRC018
QRC024 E024
QRC030 E036
QRC036 E036
QRC048 E048
QRC060 E060
1
⁄2ton (18,000 Btuh) opera-
B024
Cooling Only
E024
Heat Pump
(2) B024†
Cooling Only
Heat Pump
Heat Pump
**One circuit (2 units) unit must be field reconfigured for 1
(18,000 Btuh) operation. See Before Installation section on page 3
for details.
NOTES:
1. If your particular application requires a heat pump outdoor unit
matched with a cooling-only fan coil unit, contact your local representative for more details.
2. Numbers in ( ) indicate quantities when there is morethan one fan
coil unit in the system.
(4) B024†
(3) B024**
(2) B024
(2) E024†
(4) E024†
(3) E024**
(2) E024
E024
1
⁄2ton
Be sure unit will be operated within the application guidelines shown in Table 2. When installing the 38QRC or HDC
units, note that for cooling operation when the outdoor-air
temperature is below 55 F,the accessory low ambient or winter start kit will be required. Systems using 38HDS units can
operate down to 40 F outdoor-airtemperature as shipped from
the factory. If operation at outdoor ambients between 40 F
and −20 F is desired, an accessory winter start kit will be
required for the 38HDS unit.
To install this system, you will need:
• 1 (or more)* 40QAB or 40QAE fan coil unit(s) with stand-
ard remote thermostat
• 1 38HDC, HDS, or QRC outdoor unit
• 1 low ambient kit or 1 winter start kit (if required for your
application)
• 1 power ventilation kit (if required for your application)
• 1 condensate pump kit (if required for your application)
*More than 1 fan coil unit may be used with the 38HDS
multi-split units. Refer to 38HDS unit Price Pages for complete details.
NOTE: Refrigerant pipe, drain pipe, wire, etc., are also required to install unit and are field-supplied.
Be sure you have the required parts before beginning installation. The 40QA unit utilizes a standard 24 v control system (see Tables 3Aand 3B) for ultimate flexibility while delivering optimal levels of comfort and efficiency. Be sure to
follow these instructions carefully to obtain proper functioning of the unit.
Table 2 — Application Range
COOLING
Maximum Minimum
Indoor Outdoor Indoor Outdoor
95FDB 125FDB 67FDB 55FDB*
71FWB 57FWB 40FDB†
HEATING (Heat Pump Systems Only)
Maximum Minimum
Indoor Outdoor Indoor Outdoor
80FDB 75FDB 55FDB 220FDB
71FWB 65FWB
LEGEND
DB — Dry Bulb
WB — Wet Bulb
*This value is for 38HDC, QRC systems. The 38HDC or QRC unit
may be equipped with an accessory low-ambient control or winter
start kit that will allow operation down to 220 F.
†This value is for38HDS systems. The 38HDSunit may be equipped
with an accessory winter start kit that will allow operation down to
−20 F.
2
Table 3A — Physical Data, 40QAB Cooling-Only Units
UNIT 40QAB 024* 024 036 048 060
NOMINAL CAPACITY (Tons) 1
1
⁄
2
23 4 5
NOMINAL SIZE (Btuh) 18,000 24,000 36,000 36,000 60,000
OPERATING WEIGHT (lb) 108 108 117 149 179
MOISTURE REMOVAL RATE (Pints/Hr) 5.8 7.1 9.5 13.4 15.1
FINISH GM Motorhome White with Black Trim
REFRIGERANT R-22
Control (Cooling) AccuRaterT Piston in Fan Coil Unit/TXV in Condensing Unit
System Charge Required (lb)† 3.7 5.5 5.6/5.4** 7.4 13.6
INDOOR FAN Direct Drive Centrifugal
Rpm...Cfm High 862...500 862...500 1275...840 1435...1200 1275...1600
Rpm...Cfm Medium 690...400 690...400 972...740 1388...1160 972...1220
Rpm...Cfm Low 552...320 552...320 830...640 1315...1100 830...1040
High Speed Watts 92 92 282 425 564
Quantity...Motor Hp 1...
Blowers — No. ...Size (in.) 2...6 x 8 2...6 x 8 2...6 x 8 3...6 x 8 4...6 x 8
INDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft) 2.2 2.2 2.6 3.0 4.0
No. of Rows 44 4 4 4
Fins/in. 14.9 14.9 14.9 14.9 14.9
Circuits 44 4 8 8
FILTERS Cleanable
(Quantity) Size (in.) (4) 12 x 8
AIRSWEEP
Horizontal —
Vertical Automatic
CONTROLS
Control Voltage 24-v Provided in Control
Auto. Restart Yes
Fan Speed High/Medium/Low
Condensate Pump Safety Yes (Accessory)
Outdoor Coil High Temperature (Cooling Modes) Outdoor Coil Temperature greater than 144 F; Resets at 104 F
Filter Change Indication 250 Hours of Indoor Fan Operation (through thermostat)
REFRIGERANT LINES
Connection Type Flare
Liquid Line OD (in.)
Vapor Line OD (in.)
Maximum Length (ft) 200/50 \
Maximum Lift Fan Coil (Above Outdoor) (ft) 65/30 \
Maximum Lift Fan Coil (Below Outdoor) (ft) 150/30 \
1
⁄
15
5
⁄
8
1...1⁄
3
⁄
4
15
5
⁄
8
1...1⁄
6
(5) 105⁄8x83⁄
3
⁄
8
3
⁄
4
4
2...1⁄
15
(4) 105⁄8x83⁄
(2) 12 x 83⁄
7
⁄8††
4
4
2...1⁄
6
(6) 12 x 83⁄
7
⁄8††
CONDENSATE DRAIN CONNECTION Pipe Thread (MPT)
CONDENSATE DRAIN SIZE (in.)¶
LEGEND
TXV — Thermostatic Expansion Valve
*Field reconfigured to 18,000 Btuh (1
tion section on this page for details.
†Outdoor unit is shipped with a full charge for the smallest system
configuration. Refer to unit nameplate (on the unit) for details on
specific system charge required.
**When matched with a size 030 outdoor unit/when matched with a
size 036 outdoor unit.
1
⁄2tons). See Before Installa-
††The valve connection size is
7
is
⁄8inch.
\ Whenmatched with a 38HDC coolingonly unit/when matched with
a 38HDS multi-split unit.
¶ Flexible tubing (
is used.
3
⁄
4
3
⁄4inch. The recommended line size
5
⁄8in.)isrequired when accessory condensate pump
4
Step 1 — Complete Pre-Installation Checks
UNPACK UNIT — Store fan coil unit in the original packaging until it is moved to the final site for installation. When
removing unit from carton, lift unit by its 4 corners; DO NOT
lift unit by its plastic parts.
INSPECT SHIPMENT — Upon receipt of shipment, check
fan coil unit for damage. Forward claim papers directly to
the transportation company. Manufacturer is not responsible
for damage incurred in transit.
Check all items; if any item is missing, notify your Carrier distributor. To prevent loss or damage, leave all parts in
original packages until installation.
BEFORE INSTALLATION — Perform the following steps
before installing indoor fan coil unit. Place the indoor unit
upside down on the floor, then:
1. Remove side panels by sliding forward, then away from
sides of unit (Fig. 2). Reinstall prior to unit start-up.
2. Remove air filters from inlet grilles; then remove and re-
tain screws securing inlet grilles to indoor unit. Reinstall
prior to unit start-up.
NOTE: Dimensions shown in brackets [ ] are in mm.
Fig. 2 — Removal of Mounting Brackets
from Indoor Unit
3
Table 3B — Physical Data, 40QAE Heat Pump Units
UNIT 40QAE 024* 024 036 048 060
NOMINAL CAPACITY (Tons) 1
1
⁄
2
23 45
NOMINAL SIZE (Btuh) 18,000 24,000 36,000 48,000 60,000
OPERATING WEIGHT (lb) 110 110 119 151 181
MOISTURE REMOVAL RATE (Pints/hr) 5.8 7.1 9.5 13.4 15.1
FINISH GM Motorhome White with Black Trim
REFRIGERANT R-22
Control (Cooling) AccuRater® Piston in Fan Coil Unit
Control (Heating) AccuRater Piston in Outdoor Unit
Holding Charge (lb)† 2.0 2.0 2.0/2.5** 2.5 2.5
INDOOR FAN Direct Drive Centrifugal
Rpm...Cfm High 862...480 862...480 1275...870 1435...1130 1275...1600
Rpm...Cfm Medium 690...400 1200...480 972...750 1388...975 972...1220
Rpm...Cfm Low 552...320 1050...400 830...630 1315...820 830...1040
High Speed Watts 92 92 282 425 564
Motor Quantity...Hp 1...
Blowers Quantity...Size (in.) 2...6 x 8 2...6 x 8 2...6 x 8 3...6 x 8 4...6 x 8
INDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft) 2.2 2.2 2.6 3.0 4.0
No. of Rows 44 4 4 4
Fins/in. 14.9 14.9 14.9 14.9 14.9
Circuits 44 4 8 8
FILTERS Cleanable
Quantity...Size (in.) 4...12 x 8
AIRSWEEP
Horizontal
Vertical
1
⁄
15
3
⁄
1...1⁄
15
4
4...12 x 83⁄45...105⁄8x83⁄
1...1⁄
6
4
2...1⁄
15
4...105⁄8x83⁄
2...12 x 83⁄
4
4
2...1⁄
6
6...12 x 83⁄
4
—
Automatic
HEATER (kW) 2.0 2.0 3.0 4.0 5.0
CONTROLS
Defrost Method Timed
Manual Defrost Diagnostics Yes
Dehumidification Yes
Auto. Restart Yes
Control Voltage 24-v Provided in Control
High Indoor Coil Temperature Indoor Coil Temperature greater than 144 F; Resets at 104 F
Fan Speed High/Medium/Low
Freeze Protection Indoor Coil Less than 28 F, Resets at 50 F
Condensate Pump Safety Yes (Accessory)
Outdoor Coil High Temperature (Cooling Modes) Outdoor Coil Temperature greater than 144 F; Resets at 104 F
Filter Change Indication 250 Hours of Indoor Fan Operation (through thermostat)
REFRIGERANT LINES
Connection Type Flare
Liquid Line OD (in.)
Vapor Line OD (in.)
Maximum Length (ft) 200
Maximum Lift (Fan Coil Above) (ft) 65
Maximum Lift (Fan Coil Below) (ft) 150
5
⁄
8
5
⁄
8
3
⁄
8
3
⁄
4
7
⁄8††
7
⁄8††
CONDENSATE DRAIN CONNECTION Pipe Thread (MPT)
CONDENSATE DRAIN SIZE (in.) |
*Field reconfigured to 18,000 Btuh 11⁄2tons. See Before Installation
section on page 3 for details.
†Outdoor unit is shipped with a holding charge. Refer to unit name-
plate (on unit) for details on specific system charge required.
**When matched with 030 outdoor unit/when matched with 036 out-
door unit.
††The valve connection size is3⁄4inch. The recommended line size
is7⁄8inch.
\ Flexible tubing (5⁄8in.) is required when the accessory condensate
pump is used.
3
⁄
4
3. Remove inlet grilles from indoor unit by sliding forward.
Reinstall prior to unit start-up.
4. If necessary, reconfigure the 24,000 Btuh fan coil unit to
18,000 Btuh as follows:
a. The plug to the motor is located just outside the con-
trol box. Refer to the label diagram on the plug for
wiring for both 18,000 Btuh and 24,000 Btuh units.
b. Remove the black, blue, yellow, and red wires from
the plug. The white wire is the common and remains
in the same position.
c. Insert the blue wire into pin number 1.
d. Insert the yellow wire into pin number 2.
e. Insert the red wire into pin number 3.
f. Insert the black wire into pin number 4.
g. Check all connections to ensure they are secure.
h. Reinstall grilles using the screws removed in Step b.
i. Reinsert filters removed in Step a.
Step 2 — Select Location — Consult local building
codes and NEC for special installation requirements. See
Fig. 3 and 4 for unit dimensions and required clearances.
There are several ways the unit may be installed to different types of ceiling construction. These instructions do
not cover all installation methods. As a typical installation,
these instructions focus primarily on mounting the unit to
metal in new construction. Plan your installation carefully
before you begin. Listed below are some guidelines that should
be followed when determining location for the unit.
1. Place unit adjacent to an outside wall if fresh air is
required, ensuring that location allows for complete air
distribution.
4
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Direction of airflow.
3. Standard unit clearances are as follows:
•09on top and rear
•39on left side
•129on right side
•369on bottom
(When facing unit discharge)
WEIGHT (lb) A B E F G
UNIT
40QA
QAB QAE ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm
024 108 110 4- 2
036 117 119 4-10
048 149 151 5-11
060 179 181 7- 8 2336 7- 3 2211 7- 6
15
⁄161294 3-10 1169 4- 15⁄81260 — — 1- 95⁄8549
13
⁄161493 4- 57⁄81368 4- 91⁄21459 — — 2- 11⁄2648
9
⁄161817 5- 65⁄81692 5-101⁄41783 1- 97⁄8555 3- 31⁄16992
5
⁄82302 1-115⁄8601 4-119⁄161512
Fig. 3 — 40QA Base Unit Dimensions
5
Fig. 4 — 40QA Clearances
2. Locate the thermostat in an area which is not subjected to
drafts or direct sunlight through windows. Locate thermostat on an interior wall whenever possible.
3. Allow sufficient clearance for airflow, wiring, refrigerant
piping, and servicing unit (Fig. 3 and 4).
4. Make sure the unit is easily accessible to electrical power.
5. Run refrigerant piping as directly as possible, and avoid
any unnecessary turns or bends.
6. Condensate piping can be directed through the inside wall
to an approved drain or straight outside.
NOTE: The piping hole for condensate line must slope at
a minimum pitch of
1
⁄4in. per foot to ensure proper drainage. If proper pitch cannot be achieved, install accessory
condensate pump at this time.
Step 3 — Mount Unit — Refer to Fig. 4 for clearances
and dimensions. Use mounting template included inside box
to locate mounting bolt holes, piping holes, electrical connections, and accessory outdoor-air intake, if used.
Select proper type of hardware from the guidelines below.
See Fig. 5.
Solid structure in ceiling must be used due to the weight
of the unit.
Wooden Structure — Install hanging bolts on a square wooden
piece placed over beams.
Newly Built Concrete Slab — Install hanging bolts with inserts, embedded bolts, etc.
Metal Structure — Install hanging bolts utilizing an existing
angle or by installing a new support angle.
Previously Built Concrete Slab — Install hanging bolts with
expansion anchor.
Fig. 5 — 40QA Unit Mounting Methods
(Hardware is Field Supplied)
TO MOUNT UNIT:
1. Remove mounting bracket and reinstall the 2 hex-head
bolts (factory supplied) into each side of indoor unit as
shown in Fig. 6. Allow approximately 3/8-in. space between bolt head and unit.
2. Determine installation position, paying particular attention to piping lengths, wiring connections, clearances, etc.
See Fig. 3 for connection locations, Fig. 4 for clearances,
and Fig. 7 and 8 for bolt locations.
3. Open knockout if right-side piping connections are required (Fig. 9), by removing the pre-slit portion in the
rear of the right side panel with a saw or cutter knife.
NOTE: If accessory fan coil unit louver guard is used, install at this time. Refer to installation instructions packaged
with this accessory.
4. Mount hanging brackets on ceiling (Fig. 10) for either
concealed or exposed bolt hanging position.
6
Fig. 6 — Installing Hex-Head Mounting Bolts
in 40QA Unit
DIMENSIONS (in.)
UNIT 40QA A B C
024 50
036 5813⁄
048 719⁄
060 92 87 905⁄
15
⁄
16
16
16
46 495⁄
537⁄
8
665⁄
8
571⁄
701⁄
Fig. 7 — 40QA Unit Hanging Dimensions
5. Lift the unit into place, and fit the hex-head bolts on sides
of indoor unit into mounting slots of mounting brackets
(Fig. 11). Ensure unit is mounted level to assure proper
drainage.
6. Tighten indoor unit hex-head bolts securely.
TO INSTALL REMOTE THERMOSTAT:
If there is at least 3/8 in. of space between the back of indoor
unit and wall:
1. Route remote thermostat wires (field supplied) through
slot in right side of rear panel of indoor unit (Fig. 3).
2. Route wires over refrigerant and drain piping as shown
in Fig. 12.
IMPORTANT: Do not route wires under the piping, or
wires could impede air filter removal.
If there is less than 3/8 in. of space between back of indoor
unit and wall:
1. Cut rear bottom of the right-side panel.
2. Route remote thermostat wires through new opening.
See Step 7 — Install Remote Thermostat section on page 12
for remainder of remote thermostat installation details.
Step 4 — Connect Refrigerant Piping — Fan coil
8
2
4
8
units may be connected to outdoor units using field-supplied
refrigerant grade piping. Refer to Tables 3A and 3B 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 in the System Product Data literature.
DIMENSIONS (in.)
UNIT 40QA B C
024 46 49
036 537⁄
048 665⁄
060 87 905⁄
*Exposed mounting holes.
†Reverse bracket holes (concealed mounting).
8
8
571⁄
701⁄
5
⁄
8
2
4
8
Fig. 8 — Mounting Template Included
with 40QA Unit
Fig. 9 — Removing Rear Knockout in Side Panel
If Right-Side Piping Connection in Used
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.
To connect piping:
1. Install insulation. Insulate supply and return refrigerant
lines on heat pumps (38QRC) and mult-split condensing
(38HDS) units to prevent condensation. It is extremely
important that all refrigerant lines and the AccuRatert
metering device be insulated on heat pumps. On 38HDC
cooling only units, the liquid line may be left uninsulated. Use any acceptable heat resistant closed-cell 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.
d. For 38HDC and QRC systems only, install flare con-
nection on tubing to liquid line at fan coil unit. A piston is shipped in the AccuRater device body (Fig. 13)
with the 40QA unit. Use Tables 4-6 to verify that you
have the required piston size for the system being
installed.
7
Fig. 10 — Mounting Hanging Brackets
MOUNTING
SLOT
Fig. 11 — Hanging 40QA Unit
HEX-HEAD
BOLT
*Factory supplied.
Fig. 12 — Routing Wires Over Piping
IMPORTANT: The factory-supplied piston MUST
be installed as shown in Fig. 13.
NOTE: DO NOT install a piston on 38HDS systems. Refrigerant control is handled by a TXV (thermostatic expansion valve) in the 38HDS unit in these systems.
For special applications, such as long lines or raised elevations, consult the Application Data section of the Product Data literature for specific system requirements. The
arrow on theAccuRatert device body must face away from
the indoor coil.
e. On heat pump (38QRC) installations, install factory-
supplied piston (enclosed in a bag taped inside the outdoor unit) into the AccuRater metering device located
in the service valve on the outdoor unit (Fig. 14).
IMPORTANT:The factory-supplied piston MUST
be installed as shown in Fig. 14.
Make sure Teflon seal on the piston faces toward the
outdoor unit. Use Table 5 to verify you have the required piston size for the system being installed. For
special applications, such as long lines or raised elevations, consult the Application Data section of the Product Data literature for specific system requirements.
8
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