Fedders CH1224BBD Installation, Operation and Maintenance Manual

Category
Split-system air conditioners
Type
Installation, Operation and Maintenance Manual
Installation, Operation and Maintenance
MODEL CH10 & CH12 SERIES — 1.5 THRU 5 TON
Split System High Efficiency
Heat Pump
REV. 1/20/04 23-23-0419N-001
2
CONSUMER INFORMATION
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Operation and Maintenance Instructions . . . . . . . . . . . . . . . .3, 4
DEALER INSTALLATION
Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Evaporator & Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . .5
Copper Suction & Liquid Lines . . . . . . . . . . . . . . . . . . . . . . . . . .6
Sweat-Type Connect Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Electrical Hook-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Air Handler & Evaporator Matchups . . . . . . . . . . . . . . . . . . . . . .8
Field Charging Procedures and Charts . . . . . . . . . . . . . . . .9, 10
Refrigerant Metering Devices . . . . . . . . . . . . . . . . . . . . . . . . . .11
Defrost Control Description . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Basic Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . .12
TABLE OF CONTENTS
SERIES NOMENCLATURE
NOMINAL
CAPACITY
24
UNIT
EFFICIENCY
12
CHASSIS
B B
X
BRAND
X – V
1 = 230/208 VOLT, 1 PHASE, 60 Hz
2 = 220/240 VOLT, 1 PHASE, 50 Hz
3 = 230/208 VOLT, 3 PHASE, 60 Hz
4 = 460 VOLT, 3 PHASE, 60 Hz
5 = 230 VOLT, 3 PHASE, 50 Hz
6 = 380 VOLT, 3 PHASE, 50 Hz
D
OPTION LEVEL
D = STANDARD UNIT R-22
E = STANDARD UNIT R-407
F = HIGH & LOW PRESSURE SWITCH
OUTDOOR
HEAT PUMP
UNIT
CH
MODEL
VERSION
V = VALVE SWEAT TYPE FITTING
HEAT PUMP
NOMENCLATURE
CONGRATULATIONS
You have made a major investment in a fine piece of equipment. Keep
your investment sound by reading these instructions before installing
this unit. This will ensure that the full potential of this equipment is
achieved. It will also be helpful in avoiding any needless service costs
or operational problems. Included in these instructions are safety
rules, installation, operation, and maintenance instructions.
Your equipment is covered by a LIMITED WARRANTY against
defects in material and workmanship. Make sure that your installing
dealer or contractor has returned the factory portions of the LIMITED
WARRANTY CARD with the information properly entered to confirm
the date of installation. Failure to return the warranty card could result
in the warranty period beginning at the date of manufacture, instead of
the date of installation.
Only the highest quality components were used in the construction of
your unit. With proper maintenance, your system should provide years
of economical, trouble-free service.
INSPECTION AND UNPACKING
A thorough inspection of the shipping container should be made
immediately upon receiving your unit. Look for any punctures or
openings, and if it appears damage has occurred, it should be noted
on the freight bill before signing. The delivering carrier should be
contacted immediately to inspect damage, and no installation work
should begin until this inspection is completed.
NOTES TO INSTALLER
The words “SHALL” and “MUST” indicate a requirement which is
essential to satisfactory and safe product performance. The words
“SHOULD” and “MAY” indicate a recommendation or advice which
is not essential and not required but which may be useful or helpful.
The instructions are for the use of qualified individuals specially
trained and experienced in the installation of this type of equipment
and related system components.
Installation and service personnel are required by some locales to
be licensed. Persons not qualified SHALL NOT install this
equipment nor interpret these instructions.
This installation and maintenance manual is provided to ensure the
proper installation and the most satisfactory performance of your
equipment. The instructions contained herein SHALL NOT be
deemed to extend, modify, alter or expand any of the
representations contained in the limited warranty.
WARNING: IMPROPER INSTALLATION MAY
DAMAGE EQUIPMENT, CAN CREATE A HAZARD, AND
WILL VOID THE WARRANTY.
!
DANGER: BEFORE PERFORMING ANY WORK ON
THIS EQUIPMENT, POWER SUPPLY MUST BE
TURNED OFF AT THE HOUSEHOLD SERVICE BOX TO
AVOID THE POSSIBILITY OF SHOCK, INJURY, DEATH OR
DAMAGE TO EQUIPMENT.
!
A
24
B1
MODEL
SERIES
DESIGN
SERIES
NOMINAL
BTUH
EVAPORATOR
DESIGNATION
E= Matched System Coil
I = Mixed System Coil
Nominal Capacity
Slab Code
Coil Type: A = "A" Coil
P = Plenum Coil
Expansion Device: Two Digits = Flowrator Piston Size
E4 = Non-Bleed Type TXV 3.5 - 5 Ton
E6 = Non-Adjustable TXV, 1.5 - 3 Ton,
Matched System E-Coil
E8 = Non-Adjustable TXV, 3.5 - 5 Ton,
Matched System E-Coil
E 36 12 A 68 S R 16 M1 0 X
Branding Designation
Housing Color Designation
0 = No Color; 1 = Color
Housing Designation
i.e., M7, 72, M6, 12 (Non-Housed Coils = XX)
Drain Pan Width: 13", 15", 16", 18", 20", 21", or 23"
Manifold Position: R = Residential (Right Side)
L= Residential (Left Side)
M= Mobile Home
Connection Type: K = Mobile w/Plate Kit Option
S= Sweat
COIL NOMENCLATURE
AIR HANDLER NOMENCLATURE
The heat pump system is a highly efficient way to heat and cool your
home. During the summer months, the system transfers heat and
humidity from your home to the outside. During the winter months,
the heat pump will transfer heat from the outside to inside your
home without drying the inside air.
Please take the time to read the operation instructions below to
familiarize yourself with your new heat pump system.
The heating and cooling functions are controlled by a wall
thermostat. The type of thermostat will vary depending on customer
preference, but generally most heat pump thermostats will be
one-stage cool, two-stage heat type. The following instructions will
help you understand the operation of the thermostat and how to use
it for maximum efficiency.
FAN OPERATION: The thermostat has a fan switch for
continuous or intermittent operation. This is identified as fan ON and
AUTOMATIC. In the AUTOMATIC position the indoor fan will run
only when the compressor is running whether in heating or cooling
mode. When the compressor turns off, the indoor fan will also turn
off. In the ON position, the fan will run constantly. This position will
keep the temperature throughout the home more even and will
generally improve indoor air quality by continuously drawing the air
through the air filter, especially if the filter is of the high-efficiency
type. If this position proves drafty in the winter months, your
contractor can, in most cases, wire the indoor fan to operate
continuously on a lower fan speed, and the correct higher fan speed
when the compressor is running. This arrangement will also be more
economical to operate than the continuous high speed operation.
Turn the thermostat heat/cool switch to the cool position. Set the
desired temperature on your thermostat dial. Do not operate the
cooling unit for extended periods at indoor temperatures over 85°F.
The unit indoor design temperature range is between 70°F and 80°F
in the cooling mode.
Turn the thermostat heat/cool switch to the heat position. Set the
desired temperature on your thermostat dial. Do not operate the
heating unit at indoor temperatures over 80°F. The unit indoor
design temperature range is between 65°F and 80°F in the heating
mode.
Never operate the unit in the cooling mode at outdoor temperatures
below 60°F without a low ambient control. Never operate the unit in
the heating mode at outdoor temperatures above 70°F.
HEATING OPERATION: Turn the heat/cool switch to the
heat position and set the desired temperature on the thermostat
temperature dial.
AUXILIARY HEAT: Most heat pump installations include
electric resistance heat for auxiliary heat (when the outdoor
temperature is too low for the heat pump to provide enough heat)
and for emergency heat (the outdoor unit is not working). On a
properly-sized installation the heat pump will supply all the heat you
will need during cool weather. As the temperature drops, the heat
output from the heat pump will be reduced. The auxiliary heat
installed in your system will come on as needed to make up for this
reduction of heat output.
The need for auxiliary heat is detected by your thermostat. If the
thermostat senses a temperature fall of more than 2°F below the set
point, the auxiliary heat will turn on. For this reason, setting the
thermostat to the desired temperature and not changing the
temperature during the day can be more economical than varying
the thermostat setting.
If you intend to set the temperature back at night, you should
consider that, when the temperature is turned back up to the normal
setting, the system will be operating during the coldest time of the
day (early morning hours) and may require auxiliary heat if the
increase in temperature is above 2°F.
EMERGENCY HEAT: This switch will turn the outdoor unit
off and use the electric auxiliary heat only to provide heat. If outdoor
unit should malfunction, turn the emergency heat switch to the ON
position and contact your service person.
Your heat pump has a control system designed to defrost the
outdoor coil by warming it up to keep it clear of ice and operating
efficiently. When the temperature drops below 40°F, the control
system will sense that conditions are right for the formation of ice.
After a time period of 60 to 90 minutes, the heat pump will go into
the defrost mode. At this time, the outdoor coil may be heavily iced
or no ice may be visible, depending on the outdoor humidity. When
the unit starts the defrost mode, the outdoor fan will turn off and
you may hear a hissing noise that disappears as defrost continues.
As the outdoor coil warms, you may notice steam coming off the
coil. When the coil reaches a predetermined temperature (usually
within 7 minutes), the defrost cycle will end. You may hear a hiss
as the unit switches back to the normal heating mode.
3
OPERATION INSTRUCTIONS
THERMOSTAT
COOLING OPERATION
DEFROST OPERATION
HEATING OPERATION
1. Always install and keep filters clean. Check filters every 10
days to 2 weeks. Clean or replace if necessary.
2. Keep the condenser (outdoor coil) clean. Wash it down with
a garden hose if necessary. BE SURE THE UNIT
DISCONNECT IS IN THE “OFF” POSITION AND THAT ALL
ELECTRICAL POWER TO THE UNIT IS TURNED “OFF”
BEFORE CLEANING THE SYSTEM.
Remove any loose grass, leaves, papers, etc., from the area
around the condenser coil. These could reduce the air
supply through the coil and reduce the amount of cooling.
During cold weather, keep snow and ice that may have
accumulated away from the coil. Do not wash the outdoor
coil if the temperature is approaching or below freezing as
this will encourage ice build-up.
3. Since the heat pump unit is located outdoors, it is exposed to
all weather elements. Treat it with a good automobile paste
wax twice a year (in the spring and fall).
4
IMPORTANT: Wait at least 3 minutes after turning the heat pump off before trying to restart. If an attempt is made to start the
compressor before the refrigerant pressures are equalized, the unit may fail to restart. An additional waiting period will then be
required before restarting.
MAINTENANCE INSTRUCTIONS
WARNING:
SERIOUS PERSONAL INJURY OR
DEATH MAY RESULT IF WATER SPRAY IS
DIRECTED TOWARD LIVE ELECTRICAL CON-
NECTIONS OR POWER SOURCES.
!
1. The air inlet SHALL be located at least 12" from a wall or
other obstruction for unrestricted air flow.
2. The air outlet SHALL be located so as to direct discharged
air away from the building. (Avoid low overhanging roofs to
avoid recirculation of condenser discharge air on vertical
discharge models.)
3. Mount the unit on a sturdy base approximately 4" to 6"
above the ground. A concrete slab is recommended. If
concrete blocks are used, be sure to use well-tamped
gravel-fill beneath the blocks to prevent settling. If timbers
are used, use at least 6" x 6" timbers plus gravel-fill to
prevent settling.
4. A concrete slab should not be in contact with the building
foundation to prevent possible sound or vibration
transmission.
5. Locate the outdoor unit as close as possible to the indoor
unit. A shorter line set run will reduce refrigerant pressure
drop for increased system performance and reduce system
refrigerant charge for greater reliability.
6. If practical, unit should be located on the south side of the
structure away from northerly winds to minimize the effects
of blowing snowdrifts and freezing rain. A wind screen or
wind block can also be used. In areas known for snow
accumulation, the unit should be elevated at least 18" above
the ground.
7. Placement of the unit should be in a well-drained area, or the
unit MUST be supported high enough so run-off will not
enter the unit.
8. Avoid installations under roof overhangs without guttering.
Water draining from the roof onto the unit could produce
excessive noise and may cause ice to build up on the coil or
fan during cold weather.
9. Do not locate where heat, lint or exhaust fumes will be
discharged on the unit (as from dryer vent). Rooftop
installation is acceptable in areas of low snow
accumulations, provided the roof will support the unit and
provisions are made for water drainage and the noise or
vibration through the structure.
1. Refer to the instructions supplied with the evaporator coil.
2. When installing the evaporator, refer to page 8 for
condenser evaporator match-up. The evaporator should be
installed in an insulated plenum of proper size to
accommodate the coil, whether it be of the “A” coil or “H” coil
type design. Be sure no air can bypass the coil as this can
seriously hamper unit operation.
3. Install condensate drain as shown below. Use drain
connection size or larger.
4. Emergency drain facilities SHALL be installed on any
application where water damage may occur due to overflow,
leaking or sweating of condensate drain pan.
DO NOT OPERATE WITHOUT TRAP. UNIT MUST BE LEVEL OR SLIGHTLY INCLINED TOWARD DRAIN.
5
INSTALLATION
CODES: The installer SHALL comply with all local, state, and federal codes and/or regulations pertaining to this type of equipment and its
installation. Such codes and/or regulations should take precedence over any recommendations contained herein in lieu of local codes.
Installations SHALL be made in accordance with the National Electrical Code, local codes and recommendations made by the National Board
of Fire Underwriters.
HEAT PUMP
EVAPORATOR & CONDENSATE DRAIN
REFER TO THE CHARTS ON PAGE 8 FOR THE
RECOMMENDED TUBE O.D. SIZES ON LIQUID AND
SUCTION LINES.
Undersized line sets will increase the refrigerant pressure drop
between the indoor evaporator and outdoor unit, resulting in a
decrease in system capacity. Oversizing the line sets may result in
excessive refrigerant charge, thereby making the system more
susceptible to liquid migration.
Condensing units are available with pre-charged, sweat-type copper
connecting fittings.
1. Remove the valve core from the
schrader port. Wrap a wet rag around the
copper stub. Flux the joint and braze with
silphos rod containing at least 10%
silver. DO NOT USE SOFT SOLDER.
Replace the valve core after brazing.
2. Leak-check all braze joints at
approximately 80 psi pressure, purge,
and evacuate the lines. NOTE: DO NOT
USE AIR TO LEAK-CHECK BRAZE
JOINTS. DRY NITROGEN SHOULD BE
USED.
3. This is not a back-seating valve. To open
the valve cap use an adjustable wrench.
To open the valve, insert a hex wrench
(
3
/16" for the liquid line,
5
/16" for the vapor
line) into the stem and back out
counterclockwise until the valve stem
just touches the retaining ring. Do not
over tighten.
4. Replace the valve cap finger-tight, then
tighten an additional
1
/
12 turn or
1
/
2 hex
flat. A metal-to-metal seal is now
complete.
COPPER SUCTION & LIQUID LINES
SWEAT-TYPE CONNECT FITTINGS
6
The following guidelines should be followed when installing
refrigerant piping.
1. Run the tubing by the most direct route and support every
few feet. Do not run the lines underground unless they are in
a chase.
2. Insulate the vapor line to prevent sweating and line loss. In
underground chases, the vapor line should be insulated to
provide vibration isolation between the vapor and liquid line.
A minimum of
3
/8" insulation is recommended in conditioned
space and
1
/2" to
3
/4" in unconditioned spaces.
3. Refrigerant line length MUST NOT exceed 75' on horizontal
runs and 40' on vertical risers.
4. In general, the piping should be sloped toward the outdoor
unit to prevent oil trapping. Where vertical risers occur, a
suction line trap should be located at the base of the riser to
assure proper oil return. If the riser is over 20', an additional
trap should be installed every 20' with a maximum vertical
rise of 40'.
5. If you are making your own line sets, use only clean air-
conditioning and refrigeration-grade seamless copper
tubing. Plumbing-grade copper is inadequate.
1. The installer SHALL check available power to make certain it
matches the unit (Name Plate Rating) and that constant
voltage can be maintained to the unit. Unsatisfactory
performance would otherwise result. The local power
company should be contacted regarding problems or
questions concerning power supply.
2. Install a line service disconnect switch within sight of the
condensing unit. The line voltage service wiring for the
condensing unit should include a fused disconnect switch.
3. Use correct wire size and fuse size. To ensure that adequate
voltage will be available at the condensing unit, the line
voltage service wiring MUST be of adequate size. Minimum
recommended wire ampacities and maximum fuse sizes are
listed on the unit name plate.
4. Two holes are provided in the control box.
a. One is for the connection of the line voltage conduit
or cable. The hole is sized for
3
/4" conduit.
b. One is for low-voltage wiring. (Refer to the wiring
diagram attached to electrical box cover for
connection.)
5. Be sure to ground the condensing unit by securing the
ground wire to the grounding lug inside the control box.
6. Be sure to follow National Electrical Code and all local
codes.
7
REFRIGERANT PIPING
ELECTRICAL HOOK-UP
EVACUATION:
If the installer is making up his
own line sets, he SHALL make sure the tubing is
clean of any impurities or moisture. To ensure a
clean system, free of any contaminants, purging
with dry nitrogen and a deep vacuum is necessary
on all sweat-type models and on the uncharged
portions of all models not incorporating precharged
lines. It is desirable to pull a vacuum to 1,000
microns (29.96" Hg) to ensure trouble-free
operation of the system.
!
WARNING:
ELECTRICAL EQUIPMENT SHOULD BE
INSTALLED BY A QUALIFIED, LICENSED ELECTRICIAN.
IMPROPER ELECTRICAL HOOK-UP MAY DAMAGE
EQUIPMENT, CAN CREATE A HAZARD, CAUSE PERSONAL
INJURY OR DEATH, AND WILL VOID THE WARRANTY.
!
The following indoor coils and air handlers are designed and approved for use with the CH series units. Refer to the installation instructions
supplied with the indoor coils and air handler for installation detail. Some of the following information may not be included in those instructions
and is specific to the application of the CH series heat pump systems. If a different air handler is to be used with the matching indoor coil, refer
to the coil pressure-drop information for duct sizing requirements.
* Indoor pressure in inches based on dry coil. Increase pressure drop 25% for wet coil pressure drop.
All CH10 series outdoor units are shipped with pistons. Refer to Figure 1 on page 11 for proper installation.
* Indoor pressure based on dry coil. Increase pressure drop 25% for wet coil pressure drop.
All CH12 series units are to be matched with the air handler listed. These indoor units use a non-bleed-type expansion valve. Never use a
piston on the indoor coil when installing with a CH12 model unit. Refer to the instructions in Figure 2 on page 11 for installation of
expansion valve to indoor unit. TXV kits must be purchased as an accessory kit and are required to complete system installation.
10 FT. 15 FT. 25 FT.
CH1018B A24B1 E3009A16 600 .12
5
/16
5
/8
5
/16
5
/8
3
/8
3
/4
CH1024B A24B1 E3009A16 800 .20
5
/16
5
/8
5
/16
5
/8
3
/8
3
/4
CH1030B A30B1 E3612A16 1000 .20
5
/16
5
/8
5
/16
5
/8
3
/8
3
/4
CH1036B A36B1 E3618A16 1250 .24
5
/16
3
/4
3
/8
3
/4
3
/8
7
/8
CH1042C A48B1 E6016A20 1350 .21
5
/
16
3
/
4
3
/
8
3
/
4
3
/
8
7
/
8
CH1048C A48B2 E6026A20 1700 .30
3
/8
7
/8
3
/8
7
/8
3
/8
7
/8
CH1060C A60B1 E6037A21 1850 .29
3
/8
7
/8
3
/8
7
/8
3
/8
1
1
/8
MINIMUM RECOMMENDED TUBE O.D.
LIQUID LINE SUCTION LINE
REQUIRED
CFM
CONDENSER
MODEL NO.
AIR HANDLER
MODEL NO.
COIL MODEL NO.
(Included with
Air Handler)
INDOOR COIL
PRESSURE
DROP*
10 FT. 15 FT. 25 FT.
CH1218B A24B1 E3009A16 650 .11
5
/16
5
/8
5
/16
5
/8
3
/8
3
/4
CH1224B A24B1 E3009A16 800 .15
5
/
16
5
/
8
5
/
16
5
/
8
3
/
8
3
/
4
CH1230B A30B1 E3612A16 950 .15
5
/
16
5
/
8
5
/
16
5
/
8
3
/
8
3
/
4
CH1236B A36B2 E3618A16 1200 .20
5
/16
3
/4
3
/8
3
/4
3
/8
7
/8
CH1242C A42B1 E4824A20 1350 .26
5
/
16
3
/
4
3
/
8
3
/
4
3
/
8
7
/
8
CH1248C A60B1 E6037A21 1450 .30
5
/16
3
/4
3
/8
3
/4
3
/8
7
/8
CH1260C A60B1 E6037A21 1750 .25
3
/8
7
/8
3
/8
7
/8
3
/8 1
1
/8
MINIMUM RECOMMENDED TUBE O.D.
LIQUID LINE SUCTION LINE
REQUIRED
CFM
CONDENSER
MODEL NO.
AIR HANDLER
MODEL NO.
COIL MODEL NO.
(Included with
Air Handler)
INDOOR COIL
PRESSURE
DROP*
8
AIR HANDLER & EVAPORATOR MATCH-UPS
Because each installation is different in terms of airflow, refrigerant
line length, and configuration, the factory charge may not be correct
for the application. To assure the best performance from the system,
the refrigerant charge should be checked and adjusted if needed on
each installation.
1. 10 SEER systems (Fixed Piston-Type Metering Devices)
For systems with piston-type fixed metering devices, the
SUPERHEAT method is recommended. Read instructions
below and follow chart on page 10.
2. 12 SEER systems (Expansion Valve-Type Metering
Devices)
All 12 SEER units MUST be equipped with an indoor coil
expansion valve with internal check-valve. For systems with
expansion valve metering devices, the SUBCOOLING
method is recommended. Read instructions below and
follow charts on page 10.
9
FIELD CHARGING PROCEDURES
The superheat method is highly recommended for field charging or
checking the existing refrigerant charge in a system. Because each
installation is different in terms of indoor air flow, refrigerant line
length, duct variations, etc., the factory charge may not be correct
for every application. To assure the best performance from the heat
pump, the refrigerant charge should be checked and adjusted when
needed on each installation.
For proper superheat readings, a standard low side refrigerant
gauge and an accurate thermometer are needed. A mercury or stem
type thermometer is not adequate for suction line temperatures. We
recommend electronic thermocouple thermometers (available at
most refrigeration wholesalers); however, an accurate remote bulb
thermometer can be used. When measuring the line temperature,
be sure the thermometer is well insulated to assure accurate
measurements. The chart on page 10 gives superheat values at
various outdoor temperatures. Allow at least 5 minutes running time
between charge adjustment for the unit to stabilize.
Chart on page 10 is based on 360 to 400 CFM/ton indoor airflow and
50% relative humidity. Use on systems that cool with fixed restrictor.
SUCTION PRESSURE is 65 PSI which equals 38°F / 3.3°C on the
R-22 scale of the low side gauge.
SUCTION LINE temperature taken at the unit is 70°F / 21.1°C.
70°F / 21.1°C minus 38°F / 3.3°C equals 32°F / 17.8°C superheat.
OUTDOOR TEMPERATURE is 90°F / 32.2°C, indoor temperature is
80°F / 26.7°C.
INTERSECTION of the indoor temperatures and outdoor
temperature lines occurs on the 12°F / 6.7°C superheat line.
ADD CHARGE to obtain 12°F / 6.7°C superheat.
INSTRUCTIONS
1. Measure suction pressure and determine evaporator
refrigerant temperature on R-22 scale of low side gauge.
2. Measure suction line temperature on suction line at the
outdoor unit.
3. Measure outdoor and indoor temperature.
4. Determine from the table what the superheat should be
considering the indoor and outdoor ambient temperatures.
(Example indicates 12°F / 6.7°C superheat.)
5. Adjust charge if needed. Be sure unit is running at stabilized
condition.
NOTE: If operating superheat is more than 5°F / 2.8°C above the
chart value, add refrigerant. If below the chart value, remove
refrigerant. If below the limit line, remove refrigerant. When
removing refrigerant always be certain to use standard reclaim
procedures.
The subcooling charging method is to be used on units which have
Thermostatic Expansion Valves (TXV) as the expansion device.
For proper subcooling readings, a standard high side gauge is
required for pressure readings.
Use the chart on page 10 to determine the required subcooling value.
INSTRUCTIONS
1. Measure the outdoor air temperature. (T1)
2. Measure the liquid line pressure at the outdoor unit and
determine condenser refrigerant temperature by the scale
on the high side pressure gauge. (T2)
3. Measure the liquid line temperature on the liquid line at the
outdoor unit. (T3)
4. Subtract T3 from T2. (T2 – T3) This is the subcooling value.
Compare this value and the outdoor temperature (T1) to the
charts on page 10. If the value is below the line, add
refrigerant. If the value is above the line, remove refrigerant
charge.
NOTE: When removing refrigerant, always use standard reclaim
procedures.
SUPERHEAT CHARGING
(for units with pistons)
SUBCOOLING CHARGING
(for units with TXVs)
10
34
32
30
28
26
24
22
20
18
16
14
12
10
8
60 70 80 90 100 110
OUTDOOR TEMPERATURE °F
COOLING MODE
26
24
22
20
18
16
14
12
10
8
6
4
2
0
10 20 30 40 50 60
OUTDOOR TEMPERATURE °F
HEATING MODE
UPPER CURVE AT 80 DB, 67 WB (°F) ENTERING INDOOR TEMP.
LOWER CURVE AT 70 DB, 60 WB (°F) ENTERING INDOOR TEMP.
NOTE: All values are for reference only and may vary up or down.
All heating values are with frost-free outdoor coil.
When the outdoor temperature is below 40°F, manually defrost the unit before reading.
18
16
14
12
10
60 70 80 90 100 110
OUTDOOR TEMPERATURE °F
COOLING MODE
26
24
22
20
18
16
14
12
10
10 20 30 40 50 60
OUTDOOR TEMPERATURE °F
HEATING MODE
NOTE: All values are for reference only and may vary up or down.
All heating values are with frost-free outdoor coil.
When the outdoor temperature is below 40°F, manually defrost the unit before reading.
SUPERHEAT CHARGING CHARTS FOR UNITS WITH PISTONS
SUBCOOLING CHARTS FOR UNITS WITH THERMOSTATIC EXPANSION VALVES
A. Factory-Installed Expansion Valves
The sensing bulb must be installed to the vapor line
during the field installation. Skip to step 3 below for factory-
installed expansion valves.
B. Field-Installed Expansion Valves
1. Disassemble the flow rater body and remove the
piston from the distributor. Be sure to save the
O-ring in the tail piece.
2. Install the expansion valve between the tail piece
and the distributor as shown in Figure 2. Be sure to install
the O-rings as shown in Figure 2.
3. The bulb and capillary tubing should be routed outside of
the coils’ casing, making sure the capillary tube will not be
directly against sharp casing edges. The bulb should be
installed after the vapor and liquid line is soldered and
leak checked to prevent subjecting the bulb to excessive
heat. To assure accurate sensing and the best
performance, the bulb should be placed on the upper half
of the vapor line at the two or ten o’clock position and at
least 6" from the coil manifold as shown in Figure 2.
4. Attach the bulb securely with the copper strap provided.
5. Insulate the bulb thoroughly with a suitable insulation
material such as cork tape.
Figure 2
The indoor piston may require changing to match the outdoor unit.
The correct indoor piston is shipped with each outdoor unit. Each
coil has a marker strip, marked with the size of the factory-installed
piston located on the coil liquid line. Compare this piston marking
with the chart on page 8. If they are different, change the piston to
the correct size as shown in Figure 1.
The piston is located in the distributor fitting on the liquid line.
To change the piston, remove stub tube nut (left-hand thread) and
separate the liquid line from the distributor, then the piston. Install
the correct piston with the rounded end toward the distributor.
Reinstall the O-ring and stub nut (do not nick or handle the O-ring).
NOTE: ON PRECHARGED COIL, THE REFRIGERANT WILL
HAVE TO BE REMOVED PRIOR TO CHANGING THE PISTON.
Figure 1
11
FIXED PISTON TYPE RESTRICTORS
EXPANSION VALVES
REFRIGERANT METERING DEVICES
NOTE: The indoor expansion device size and type are located on the outdoor unit’s series and rating plate.
COOLING MODE
The indoor low-voltage thermostat connects the indoor unit
transformer “R” to “Y” and “O” of the outdoor unit defrost board. The
system reversing valve is in the energized position during the
cooling mode. The “O” terminal is powered, supplying power to the
reversing valve solenoid through the “rev” terminals. The low-
voltage Y terminal of the control will energize the contactor latch coil,
energizing the compressor and fan motor. The fan motor is wired
through the N/C points of the control board relay. The fan motor will
be energized with the compressor except during defrost.
HEATING MODE
With the indoor thermostat system switch turned to heat, the
thermostat connects the indoor unit transformer “R” to “Y” at the
defrost board. The low-voltage “O” terminal is not energized. The
reversing valve solenoid is not energized (keeping the reversing
valve in the heat position). The “Y” terminal will energize the
contactor latch coil, energizing the compressor and fan motor. The
fan motor will be energized with the compressor except during
defrost.
DEFROST MODE
When the outdoor coil refrigerant entering temperature falls below
30°F ± 2°F, an outdoor defrost thermostat closes. (This thermostat
is located on a coil tube.) When the thermostat closes, a timer on the
board will start (30, 60, or 80 min.). At the end of that time interval
the controller will start the defrost cycle regardless of the outside
temperature. During the defrost cycle the controller energizes the
reversing valve solenoid and de-energizes the outdoor fan. This
builds up heat on the outdoor coil during defrost. The defrost control
energizes the indoor auxiliary heat relays through “W2” (second-
stage heat) on the thermostat. When the defrost thermostat reaches
70°F ± 2°F or after 10 minutes, the defrost cycle will end. Defrost
time is limited to 10 minutes regardless of the coil temperature.
DEFROST TIME SELECTION
The defrost control has three selectable time intervals (30, 60 and
80 minutes). The timing is to be set at either 60 or 80 minutes,
depending on the rate of frost accumulation. To change the time,
move the timer jumper wire to the post marked 60 for 60 minutes or
80 for 80 minutes.
DEFROST TEST PINS
The defrost control has test pins to speed up the defrost time setting
by a factor of 256.
To initiate a defrost cycle without waiting for the time to accumulate,
jumper the two test pins (marked test) together. If the coil
temperature is above 28°F, jumper the DFT (defrost thermostat)
terminals to simulate a closed thermostat. Defrost should begin after
14 seconds for a 60-minute setting, and 21 seconds for an 80-
minute setting. If the jumper is removed immediately when the
defrost cycle starts, the cycle will end when the defrost thermostat is
opened (coil above 70°F). If the test pins remain jumped and the
defrost thermostat is closed, the defrost will end in 2.3 seconds (10
minute default/256).
HIGH PRESSURE SWITCH LOCK-OUT
The defrost control board is equipped with a High Pressure Lock-
out. The high pressure switch is wired to the defrost control board.
This is a normally closed switch that opens if the high side pressure
exceeds 425 psi. and closes when this pressure drops back to
300 psi. If the switch is activated, a lockout relay, internal to the
defrost board, will de-energize the contactor “Y out” terminal to shut
down the compressor and outdoor fan.
Reset High Pressure Lock-out: To reset the High Pressure Lock-
out, the indoor thermostat must be switched to the off position then
back to the Heat or Cool position. This will de-energize the “Y in”
terminal of the defrost board, resetting the lock-out relay of the
board.
The outdoor unit uses an integrated defrost control to manage the
following control functions of the system:
1. Off and on functions of the outdoor fan during the defrost
and heating mode.
2. Off and on functions of the reversing valve during the defrost
and heating mode.
3. Off and on functions of the auxiliary heat relays during the
defrost mode.
The control is a time-and-temperature type with selectable defrost
time intervals of 30, 60 and 80 minutes. 24 volts AC is used for
control circuit input and output. A SPNC relay controls the outdoor
fan motor. A lockout relay is also incorporated to lockout the
contactor 24-volt circuit when the high-pressure switch is
activated. Lockout can be reset by switching the indoor
thermostat off and back on.
BASIC SEQUENCE OF OPERATION
DEFROST CONTROL DESCRIPTION
The information in this manual supersedes and replaces the previous instruction/operation manual with regard to split system heat pump
products. Illustrations cover the general appearance of the units at the time of publication and the manufacturer reserves the right to make
changes in design and construction at any time without notice.
For replacement parts contact:
CareCo
415 Wabash Ave.
Effingham, IL 62401
Phone: 1-866-829-2440
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Fedders CH1224BBD Installation, Operation and Maintenance Manual

Category
Split-system air conditioners
Type
Installation, Operation and Maintenance Manual

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