Fedders CH1224BBD Installation, Operation and Maintenance Manual

Brand: Fedders

Model: CH1224BBD

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

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

UNIT

EFFICIENCY

CHASSIS

B B

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

OPTION LEVEL

D = STANDARD UNIT R-22

E = STANDARD UNIT R-407

F = HIGH & LOW PRESSURE SWITCH

OUTDOOR

HEAT PUMP

UNIT

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.

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.

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).

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.

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

(

/16" for the liquid line,

/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

12 turn or

2 hex

flat. A metal-to-metal seal is now

complete.

COPPER SUCTION & LIQUID LINES

SWEAT-TYPE CONNECT FITTINGS

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

/8" insulation is recommended in conditioned

space and

/2" to

/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

/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.

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

/16

CH1024B A24B1 E3009A16 800 .20

/16

CH1030B A30B1 E3612A16 1000 .20

/16

CH1036B A36B1 E3618A16 1250 .24

/16

CH1042C A48B1 E6016A20 1350 .21

CH1048C A48B2 E6026A20 1700 .30

CH1060C A60B1 E6037A21 1850 .29

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

/16

CH1224B A24B1 E3009A16 800 .15

CH1230B A30B1 E3612A16 950 .15

CH1236B A36B2 E3618A16 1200 .20

/16

CH1242C A42B1 E4824A20 1350 .26

CH1248C A60B1 E6037A21 1450 .30

/16

CH1260C A60B1 E6037A21 1750 .25

/8 1

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*

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.

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)

60 70 80 90 100 110

OUTDOOR TEMPERATURE °F

COOLING MODE

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.

60 70 80 90 100 110

OUTDOOR TEMPERATURE °F

COOLING MODE

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

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

Fedders CH1224BBD Installation, Operation and Maintenance Manual

Brand: Fedders

Model: CH1224BBD

Category: Split-system air conditioners

Type: Installation, Operation and Maintenance Manual

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Fedders CH1224BBD Installation, Operation and Maintenance Manual

Fedders CH1224BBD Installation, Operation and Maintenance Manual

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