Carrier 38QRR018300 User Manual HEAT PUMP Manuals And Guides 1008629L

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Installation Instructions
SAFETY
Improper

installation,

CONSIDERATIONS
adjustment,

alteration,

service,

maintenance,

or use can cause explosion,
fire, electrical
shock,
or other
conditions
which may cause death, personal injury, or property
damage.
Consult a qualified
installer,
service agency, or your
distributor
or branch for information
or assistance. The qualified
installer or agency must use factory-authorized
kits or accessories
when modifying
this product. Refer to the individual
packaged with the kits or accessories when installing.

instructions

Follow all safety codes. Wear safety glasses, protective
clothing,
and work gloves. Use quenching
cloth for brazing
operations.
Have
a fire extinguisher
available.
Read
these
instructions
thoroughly
and follow
all warnings
or cautions
included
in
literature and attached to the unit. Consult local building codes and
the current
NFPA70.
A07532

Fig. 1 - 38QRR

the

National

In Canada, refer to the current
Code CSA C22.1.

editions

Recognize
NOTE:
Read
installation.

the entire

TABLE

instruction

manual

before

starting

the

OF CONTENTS

CONSIDERATIONS

INSTALLATION
Complete

Rig and Mount

SERVICE

Unit

Refrigerant

Make Electrical
START-UP

1

.................................
Pre-Installation

Complete

........................

Checks

2-3
...................

2

..............................
Piping

Connections

Connections

2
.............

4
5

...................................
...........................

Code

of the Canadian

This is the safety-alert

(NEC)
Electrical

symbol

/_.

When you see this symbol on the unit and in instructions
or
manuals, be alert to the potential for personal iniury. Understand
the signal words DANGER,
WARNING,
and CAUTION.
These

or death. WARNING
signifies hazards
which could
result in
personal
iniury or death. CAUTION
is used to identify unsafe
practices which may result in minor personal iniury or product and
property damage. NOTE is used
will result in enhanced installation,

to highlight
suggestions
reliability, or operation.

which

3

.........................................

TROUBLESHOOTING

safety information.

Electrical

3

........................

........................................

MAINTENANCE

of

words are used with the safety-alert
symbol. DANGER
identifies
the most serious hazards which will result in severe personal iniury

PAGE
SAFETY

editions

7
9-10

ELECTRICAL

SHOCK

HAZARD

Failure to follow
or death.

this warning

could

result in personal

iniury

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.

ENVIRONMENTAL
Failure to follow
pollution.

HAZARD
this caution

may result

in environmental

Remove and recycle all components
or materials
refrigerant, etc.) before unit final disposal.

(i.e. oil,

INSTALLATION

After

system

section

installation

is complete,

in this document

to check

see the Refrigerant

and/or

Charging

acliust refrigerant

charge.

HEATING
CAP

UNIT

OPERATION

AND SAFETY

Failure to follow this warning
or equipment damage.

FLARE

HAZARD

could result in personal

iniury

ONNECTOR

HETERED

Puron
(R-410A)
refrigerant
systems
operate
at higher
pressures
than standard R-22 systems. Do not use R-22
service
equipment
or components
on Puron
refrigerant
equipment.

A07407

Fig. 2 - AccuRater
Metering
RIG
PERSONAL
HAZARD

INJURY

AND

EQUIPMENT

Failure to follow this caution
and / or equipment damage.
DO NOT
removed.

operate

without

a filter

Mounting

PRE-INSTALLATION

CHECKS

System

Consult

local

if shipment is damaged or
to ensure units match job

codes

and

NEC

for special

sufficient

space

for airflow

piping, and servicing unit. Locate
unrestricted
on both sides.

clearance,

wiring,

Unit may be mounted
on a level pad directly
mounted on raised pads at support points.
Matching

the Heat Pump

to an Indoor

on base

legs

or

Unit

and residential
fan coils and evaporator
indoor unit literature for more information.
Device

- Ducted

System

IMPORTANT:

coils.

Refer

installing

single or nmltiple

enclosed

area,

ram) n_ininmm

clearance

on

ram) n_ininmm

clearance

on

units

into

units in an alcove,

there

of discharge

so discharge

nmltiple

one unit is not drawn

ensure

clearance
clearance

is adequate

of one

units,

ensure

another

unit.

the
When

roof well or partially

ventilation

to prevent

air.

Ambient

Minimum
(13°C),

Cooling

8" (203.2

installing

air from

Operating

to separate

When

discharge

recirculation

The 38QRR heat pump units can be matched to corresponding
indoor units. The 38QRR unit can be matched with under-ceiling

Expansion

With coil facing walk Allow 6" (152.4 ram) minimum
on coil side and coil end and 36" (914.4 ram) minimum
on compressor
end and fan side

With multi-unit
application:
Arrange
does not enter inlet of another.
is

ram)

Requirements

refrigerant
airflow

temperatures

feet.

installation

unit so that condenser

subfreezing

unit be fastened to a pad, 6
be used and fastened through

fan side and coil end and 36" (914.4
compressor
end and coil side.

requirements.
Allow

in unit mounting

With fan facing wall: Allow

Requirements

building

prolonged

on Roof

Clearance

requirements.
Consider

UNIT

Mount unit on a level platform or frame at least 6 in. (152.4
above roof surface. Isolate unit and tubing from structure.

being

Shipment

File a claim with the shipping company
incomplete.
Check the unit nameplates

Components

or local codes require
tie-down bolts should

slots provided

carton,

type)

on Ground

Mounting

Move the unit to final location. Remove
unit from
careful not to damage service valves and grilles.

Device

snow stand or ice rack where
or heavy snow occurs.

grille

Unit

Inspect

MOUNT

(bypass

Mount unit on a solid, level concrete pad. Position unit so water or
ice from roof does not fall directly onto unit. Use field-provided

iniury

or with

AND

If conditions
field-supplied

COMPLETE
Unpack

the unit

DAMAGE

may result in personal

FLOW

HEATING

outdoor
naaxinmm

operating
125°F

ambient

in cooling

mode

is 55°F

(52°C).

Mode

A hard shutoff, thermostatic
expansion
valve (TXV) is required at
the indoor section of the system for proper operation
of these
products. If the indoor section of the system is not equipped with a
hard shutoff TXV, refer to Spec Sheet for the correct TXV kit to be
installed. Follow the instructions
in the kit for proper installation.
Expansion

Device

A piston

is

40QAQ018-048
unit instructions
Check

AccuRater

The correct
for system

- Duct

used

as

under-ceiling
for details.
Metering

AccuRater
capacity

field-replaceable

Free System

the

metering
indoor
Device

Cooling
device
unit.

- Heating

Mode
when

Refer

installing
to the indoor

Mode

(bypass type) refrigerant control is required
optimization.
An AccuRater
device with

piston is supplied

with the outdoor

unit (see Fig.

2).

AND/OR

Failure to follow
and/or equipment

may result

refrigerant
are included

lines. See Fig. 2. Piston
in the indoor unit installation

replacement
instructions.

this caution
damage.

Be sure unit panels

are securely

EQUIPMENT
in personal

injury

in place prior to rigging.

Keep the unit upright and lift unit using a sling. Use cardboard
or
padding under the sling, and spreader bars to prevent sling damage
to the unit. See Fig. 3. Install the unit so that the coil does not face
into prevailing
winds. If this is not possible and constant winds
above 25 mph are expected,
use accessory
wind baffle.
See
installation

Do not interchange
components
between
the AccuRater
device
types. Matching of outdoor unit with indoor unit may require field
replacement
of piston.
Replace
piston,
if required,
before
connecting
instructions

a

PERSONAL
INJURY
DAMAGE HAZARD

NOTE:
accessory

instructions
Accessory

low ambient

Field-fabricated

provided

wind

with the accessory

baffles

temperature

snow or ice stands

should

kit.

be used on all units with

control.
may be used to raise unit when

operation will be required during winter months.
wall mounted using the accessory wall mounting

Units may also be
kit.

SLING

PADDING

COMPRESSOR
END

CENTER OF
GRAVITY

A05227

Fig. 4 - Filter

Drier

Components

A07396

Fig. 3 -

Lifting

Unit with

COMPLETE
REFRIGERANT
CONNECTIONS

The filter drier nmst be replaced
is exposed to the atmosphere.

Sling

Only use factory
working pressures

PIPING

Outdoor units may be connected
to indoor units using
field-supplied tubing of refrigerant grade and condition. See
Product Data for correct line sizes. Do not use less than 10 ft (3.05
m) of interconnecting tubing.

UNIT

DAMAGE

NOTE:

whenever

specified
liquid-line
less than 600 psig.

Do not install a suction-line

Make

Piping

Remove

Sweat

plastic

the refrigeration
filter

driers

system

with

rated

filter drier in liquid line.

Connections

caps from

liquid

refrigerant grade tubing. Service
and are ready for brazing. After

and suction

service

valves.

Use

valves are closed from the factory
wrapping
the service valve with a

wet cloth, the tubing set can be brazed to the service valve using
either
silver bearing
or non-silver
bearing
brazing
material.
Consult local code requirements.
Refrigerant tubing and the indoor

HAZARD

coil are now ready for leak testing.
Failure
damage

to follow
or improper

this caution
operation.

may

result

in

equipment

If any section of pipe is buried, there nmst be a 6 in. (152.4
ram) vertical rise to the valve connections
on the outdoor
unit. If more than the recommended
length
is buried,
refrigerant
may nfigrate to cooler, buried
section during
extended periods of system shutdown.
This causes refrigerant
slugging
and could possibly
damage
the compressor
at

Pass

nitrogen

)revent

When more than 80 fl (24.4 m) of interconnecting

tubing and more

than 20 ft (6.1 m) of vertical lift is used, consult the residential
Long Line Application
Guide for required
accessories.
If either
refrigerant tubing or indoor coil is exposed to the atmosphere,
the
nmst be evacuated

Run refrigerant

tubes

following

as directly

good

refrigeration

as possible,

avoiding

or other

formation

UNIT

start-up.

system

NOTE:
Unit is shipped with Puron
charge indicated on nameplate.

gas through

damage

practices.

• Use a brazing

unnecessary

• Wrap service

factory

piping

while

brazing

result

in equipment

to

HAZARD

to follow this caution
or improper operation.

To prevent
following:

refrigerant

of copper oxide.

DAMAGE

Failure
damage

inert

(R-410A)

may

to unit or service

valves

observe

the

shield.
valves

with wet cloth or use a heat sink

turns and bends. Suspend refrigerant tubes so they do not damage
insulation on vapor tube and do not transnfit vibration to structure.
Also, when passing
refrigerant
tubes through
a wall, seal the

Provide Safety Relief

opening so that vibration
is not transnfitted
to structure.
Leave
some slack in refrigerant tubes between structure and outdoor unit

A fusible plug is located in unit suction line; do not cap this plug.
If local code requires additional safety devices, install as directed.

to absorb
instructions

MAKE

Filter

vibration.
Refer to separate
for additional information.

indoor

unit

installation

material.

ELECTRICAL

CONNECTIONS

Drier

Refer to Fig. 4 and install filter drier as follows:
1. Braze 5 in. (127 ram) liquid

tube to the indoor

2. Wrap filter drier with damp

cloth.

3. Braze

filter drier to 5 in. (127 ram)

coil.

long liquid

tube from

step 1.
4. Connect

and braze liquid refrigerant

tube to the filter drier.

ELECTRICAL

SHOCK

Failure
death.

this warning

to follow

HAZARD
could

result in personal

iniury or

The unit cabinet
must have an uninterrupted
or unbroken
ground to nfininfize personal iniury if an electrical fault should
occur. The ground
may consist
of electrical wire or metal
conduit when installed in accordance
with existing electrical
codes.

through opening in unit side panel to connection in unit control
box.
m

UNITDAMAGE
HAZARD
Failure
to follow
this caution may
damage

or improper

COHHON

(C)--BLK

--_

--

--

--

--

-_

--

--

-'_

--

--

(M2)--WHT,.._

result

in equipment
COOL

operation.

(Y)--YEL

24VAC
(R)--RED
REQUIRED
HEAT
(O)--ORG

Unit failure as a result of operation on improper line voltage
or excessive
phase imbalance
constitutes
abuse and may
cause damage
to electrical
components.
Such operation
would void any applicable Carrier warranty.

(REV,

{Zg

"_

VALVE)

24VAC
SUPPLY
REQUIRED

FIELD SUPPLIE
T'STAT WIRE

OUTDOOR UNIT

INDOOR

UNIT

LOW VOLTAGE CONNECT[0N5
A07429

Fig. 6 - 38QRR
ELECTRICALSHOCK

HAZARD

NOTE:

Use

minimum)

wire. If thermostat

No.

Failure to follow this warning could result in personal iniury or

from unit, as measured

death.

AWG

Before performing
service or maintenance,
main power
switch is turned OFF and
stopped.
Power

be sure indoor
indoor blower

unit
has

accessible,

shown
within

but out of reach of children.

on nameplate.
Provide
sight from unit, readily
Provision

switch open (off) is advisable to prevent
on while unit is being serviced.

power

for locking

the

from being turned

Disconnect
switch, fuses, and field wiring must comply with the
NEC and local code requirements.
Use copper wire only between
the disconnect
switch and unit. Use minimum
75 C wire for the
field power

AWG

along

Operating

(35°C

line voltage

may

use No. 16

drop.

and local codes.

See Product

voltage

wires,

voltage

constitutes

abuse

Data. Do not install

fluctuate

above

or below

limits.

to the

making

warranty.

where

insulated

voltage

to NEC

unit on improper

in a system

Refer

color-coded,

the control

NOTE:

affect Carrier

Connections

is located more than 100 ft. (30.5 m)

All wiring must conform

permissible

Circuit

wire to avoid excessive

Product

electrical

refrigerant

piping

Data

for recommended

connections,

provide

fuse

clearance

sizes.

When

at the unit

for

connections.

NOTE:
The 38QRR units use the control
with the matched indoor unit.

transformer

supplied

START-UP
PRELIMINARY

connection.

18

Control

NOTE:

unit

Unit is factory wired for voltage
adequate, fused disconnect
switch

color-coded

and could

Wiring

Typical

CHECKS

Route power wires through the opening in unit side panel and
connect in the unit control box as shown on the unit label diagram

1. Check that all internal wiring connections are tight and that
all barriers, covers, and panels are in place.

and Fig. 5. Unit must be grounded.

2. Field electrical power source must agree with unit nameplate rating.

- ....
_NcNi_NTOEc

GROUND

LEAD -

GROUNDING

T

SINGLE-PHASE[_
PER NEC

3. All service valves must be open.
4. Belly-band crankcase heater must be tight on compressor
crankcase for those units with belly-band heaters.
EVACUATE
AND DEHYDRATE

LUG

BLK

--

/
BLK--

I

SIngLE'-PHASE

UN,f

Field piping

and fan coil must be evacuated

CHARGE

SYSTEM

Release
suction

BLK -3-PHASE
CONN, TO
DISCONNECT
PER NEC
TB
.....

GROUND

LEAD -_ _]

GROUNDING

Be sure

LUG

3-PHASE

UNIT

check

LEGEND
--O
....

National Electrical
Terminal Board

Code

A07428

Fig. 5 - Line
Control

Circuit

Power

Connections

Wiring

Control voltage is 24 v (40 va minimum).
See Fig. 6 and unit label
diagram
for field-supplied
wiring
details.
Route control wire

UNIT

that the field
ambient

disconnect

temperature.

system refrigerant

NOTE:

When

start-up

instructions

procedures.

TB Connections
Field Wiring
Factory Wiring

liquid line.

START

below

NEC
TB

charge into system by opening (backseating)
liquid and
line service valves. Outdoor unit is charged for 15 ft (4.6

m) of 3/8-in.
TO

and dehydrated.

is closed.

Operate

charge.

Set room
for 15

See Refrigerant

using in coniunction
included

unit

with

Charging

with 40QA
fan coil

thermostat

minutes,

fan coils,

for correct

then

section.
refer to
start-up

SERVICE
UNIT
ELECTRICALSHOCK
Failure to follow
or death.

HAZARD

this warning

could

result in personal

The unit coils hold only the factorydesignated amount of
refrigerant. Additional refrigerant may cause units to relieve
pressure through the compressor internal pressure relief
valve (indicated by a sudden rise of suction pressure) before
suction pressure reaches 20 psig. If this occurs, shut off unit
immediately then frontseat the suction valve and remove
and recover excess refrigerant following accepted practices

Fan

A reinforced
wire mount
holds the outdoor
fan
position. See Fig. 7 for proper mounting position.
II
i i

"

_,,,,_

assembly

in

3. Start unit and run until suction
4. Shut unit off and frontseat

High-Pressure
OUTSIDEEDGE
OF GRILLE

pressure

suction

5. De-pressurize
low side of unit
lowing accepted practices.

FAN BLADE

I
OUTSIDEEDGE OF
FAN DECK

HAZARD

injury

Before
installing,
modifying,
or servicing
system,
main
electrical disconnect
switch nmst be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
Outdoor

DAMAGE

Failure to follow this caution may result in equipment
damage or improper operation.

DIMENSION FROM
OUTSIDE TOP EDGEOF
BLADETO
OUTSIDE EDGE
OF
FAN DECK.SEETABLE
BELOW

reaches

20 psig.

valve.

and recover

refrigerant

fol-

Switch

The high-pressure
switch,
located
against high
discharge
pressures

on discharge
line, protects
caused
by such events
as

overcharge,
condenser-fan
motor failure, system restriction,
etc. It
opens on pressure rise at about 650 -+ 10 psig. If system pressures
go

above

this

setting

during

abnormal

conditions,

the switch

opens.

38QRR Unit Size, in. (mm)
018,024

030,036

048,060

0.433 (11.00)

0

0
A07401

Fig. 7 - Condenser
High-Pressure

Current

in the compressor.
The
of approximately
550 to

(low side) and discharge

automatically

Sensitive
when

Overload

internal

pressure

compressor

temperature
drops to a safe level (overloads
may require
nfinutes to reset). When an internal overload is suspected
open, check by using an ohmmeter or continuity
tester.
Pumpdown

(high side)

DO
NOT
abnormalities
hazard.

motor
up to 45
of being

Procedure

Crankcase

on the

Failure
damage

DAMAGE

may

Never open system to atmosphere

2. Frontseat

gage to suction

the liquid/nfixed

result

in

while it is under

When system nmst be opened for service,
vacuum with dry nitrogen before opening
pressure

to
simulate
pressures
pose

is checked

these
system
a serious safety

with

625 psig switch shows

in personal

an ohmmeter.

If system

continuity.

both compressor

service

valves

nmst be closed.

The crankcase heater is powered by the high-voltage
power of the
unit. It is connected
across the line side of the contactor
and is
controlled.

HAZARD

to follow
this caution
or improper operation.

1. Attach

result

Heater

thermostatically

UNIT

could

The
crankcase
heater
prevents
refrigerant
migration
and
compressor
oil dilution during shutdown
when compressor
is not
operating.
If the crankcase heater is de-energized
for more than 6
hours,

The system may be pumped down in order to make repairs
low side without losing complete refrigerant charge.

switch

is below

HAZARD

this warning

attempt
- high

The high-pressure

and Temperature

resets

INJURY

Failure to follow
injury or death.

relief valve is located
at a pressure differential

625 - 50 psig between suction
to allow pressure equalization.

The control

PERSONAL

Positions

Relief Valve

The high-pressure
relief valve opens

Internal

Fan Mounting

phase

equipment

PERSONAL

a vacuum.

Failure to follow
or death.

recover refrigerant,
system.

service

break

valve gage port.

line valve.

INJURY

HAZARD

this warning

could

result in personal

Use extreme caution when troubleshooting
line voltage is continually present.

injury

this device

as

To troubleshoot:
1. Apply

voltmeter

across crankcase

heater leads to see if heat-

er voltage is on. Do not touch heater. Carefully
feel area
around crankcase heater; if warm, crankcase heater is functioning.
2. With power off and heater leads disconnected,
check across
leads with ohmmeter.
Do not look for a specific resistance
reading. Check for resistance or an open circuit, and change
heater if an open circuit

is detected.

Service

Valves

FROM
TO OUTDOOR

TO ACCUMULATOR

INDOOR

SERVICE

COIL

VALVE

VIA

ON

The service valves in the outdoor unit come from the factory
frontseated.
This means the refrigerant charge is isolated from the
line-set connection
ports. To prevent damage to the valve, use a
wet cloth
brazing.

or other accepted

heat sink material

on the valve before

The service valve cannot be field repaired,
therefore,
only a
complete
valve or valve stem seal and service port caps are
available

for replacement.

Defrost
The

LEGEND
TP -- Test Point

Controls

control,

which

consists

of defrost

control

board

and defrost

A07433

thermostat,
interrupts
the normal
system
heating
operation
to
defrost the outdoor coil, if the coil saturated suction temperature
indicates freezing temperatures.
set to check need for defrost

Defrost control
every 30, 50,

Fig. 8 (Cooling

board can be field
or 90 minutes
of

Mode

Reversing

or Defrost

FROM OUTDOOR
COIL

operating
time, by connecting
the jumper
(labeled Wl, on the
circuit board) to the spade terminal for the defrost time desired. The
board is factory set for 90 minutes. The defrost period is field

Mode,

Valve
Solenoid

TO ACCUMULATOR

INSULATE
FOR ACCURATE
READING
TP'3

TP-4

Energized)

TO INOOOR COIL VIA
SERVICE VALVE ON
OUTDOOR COIL

TP-2

selectable, depending
upon geographic
areas and defrost demands.
Control board has additional feature that allows unit to restart in
defrost
control

cycle if room
simultaneously

solenoid
to return
condenser,
indoor
electric heater.

thermostat is satisfied during
tops outdoor fan, energizes
system
to cooling
unit as evaporator),

defrost. Defrost
reversing valve

INSULATE FOR
ACCURATE READING

cycle (outdoor
unit as
and activates
accessory

FROM

ELECTRON IC

A07434

defrosting
before
10 minutes
have elapsed.
When
is terminated,
the outdoor-fan
motor is energized,
and

reversing
cycle.

valve

Reversing

LINE

LEGEND
TP -- Test Point

The defrost timer limits defrosting
period to 10 minutes. Normally,
the frost is removed
and the defrost thermostat
contacts open to
terminate
defrosting

COMPRESSOR

DISCHARGE

solenoid

is de-energized,

returning

Fig. 9 (Heating

unit to heating
Refrigerant

Valve

Reversing

Mode,

Solenoid

Valve
De-energized)

Char_in_

In heat pumps, changeover
between heating and cooling modes is
accomplished
with a valve that reverses flow of refrigerant in the
system. The reversing
valve solenoid can be checked with the
power off using an ohmmeter.
ground.
voltage
With

unit operating,

condensate
Using

Check for continuity

PERSONAL
INJURY
DAMAGE HAZARD

AND/OR

Failure to follow
and/or equipment

could

such as frost or
and

Wear safety glasses
Do not overcharge
flooding.

and shorting

to

With control circuit (24 v) power on, check for correct
at solenoid coil, and for burned or overheated solenoid.
other

on refrigerant

a remote

items can be checked,
lines.

measuring

device,

check

inlet

temperatures.
Do not touch lines. If reversing valve
normally, inlet and outlet temperatures
on appropriate

outlet

line

is operating
lines should

this warning
damage.

EQUIPMENT

result in personal

and gloves when handling
system
- this can cause

iniury

refrigerant.
compressor

be similar. Any temperature
difference would be due to heat loss or
gain across valve body. Temperatures
are best checked
with a
remote reading electronic-type
thermometer
with multiple probes.
Figures 8 and 9 show test points on reversing valve for recording
temperatures.
Insulate points for more accurate reading. If valve is
defective:
1. Shut off all power

to unit.

2. Remove

all charge

from system.

3. Remove

valve using a tubing

cutter.

4. Install new valve (wrap valve
overheating
while brazing).
5. After valve is brazed

with

a wet rag

to prevent

in, check for leaks.

6. Evacuate and charge system. Operate system in both modes
several times to be sure valve functions properly.

PERSONAL
INJURY
DAMAGE
HAZARD

AND/OR

Failure to follow
and/or equipment

could

this warning
damage.

EQUIPMENT

result in personal

iniury

Service valves must be fully backseated
to close service
port. There is no Schrader valve at the service port, and
failure to backseat the valve could result in loss of system
charge or personal iniury.
NOTE:

Do

atmosphere.

not

Remove

vent

or

de-pressurize

and recover

refrigerant

unit

refrigerant

following

to

accepted

practices.
All units
nameplate.
Refer

are shipped

to Product

with Puron
•

the refrigerant

Data and consider

(R-410A)
Puron

with

charge

the following

refrigerant:

refrigerant

cylinders

are rose colored.

listed
when

on the
working

•

Recovery

cylinder

service

psig, DOT (Department
DOT BW400.

•

pressure

rating

must

of Transportation)

be 400

4BA400

or

Puron systems should be charged with liquid refrigerant.
Use a commercial type metering device in the manifold
hose when charging into suction line with compressor operating.

•

Manifold sets should be 700 psig high side and 180 psig
low side with 550 psig low-side retard,

•

Use hoses with 700 psig service pressure rating.

•

Puron refrigerant, as with other HFCs, is only compatible
with POE oils.

•

Vacuum pumps will not remove moisture from oil.

•

Polyol Ester oils absorb moisture rapidly, Do not expose oil
to atmosphere,

length above or below 15 ft (4.6 m) only. Charge level should then
be appropriate for the system to achieve rated capacity. The charge
level could then be checked at another time when the both indoor
and outdoor

Polyol Ester oils may cause damage to certain plastics and
roofing materials,

•

Wrap all filter driers and service valves with wet cloth when
brazing.

•

factory approved, liquid-line filter drier is required on every unit,

charging
Units

Check

To check

Chart

system

Procedure

operation

- Heating

during

installed

Pistons
with

indoor

pistons

require

unit

a minimum

of

charging

is valid

10 nfinutes

2. Measure suction pressure by attaching
suction valve service port.

by

the

when indoor

before

checking

an accurate

gauge

to

3. Measure
suction
temperature
by attaching
an accurate
thernfistor type or electronic thernmmeter
to suction line at
service valve.
4. Measure
outdoor
thernmmeter.

air

dry-bulb

temperature

5. Measure
indoor
air (entering
indoor
temperature
with a sling psychrometer.

coil)

with

wet-bulb

6. Refer to Table 1. Find outdoor temperature
and evaporator
entering air wet-bulb
temperature.
At this intersection,
note
superheat.
7. Refer to Table 2. Find superheat temperature
located in item
6 and suction pressure. At this intersection,
note suction line

Mode

heating

range.

requirements.

with Indoor

1. Operate
charge.

If using a suction line drier, do not leave in place for more
than 72 hours,

Heating

are in a more favorable

superheat
method. The following
procedure
airflow is within ---21% of its rated CFM.

Do not use a TXV (thermostatic expansion valve) designed
for use with R-22 refrigerant. Refer to separate indoor unit
installation instructions for more details,

•

temperatures

NOTE:
If line length is beyond 80 ft (24.4 m) or greater than 20 ft
(6 m) vertical separation,
See Long Line Guideline
for special

Units

•

•

If the indoor temperature
is below 70°F (21°C), or the outdoor
temperature
is not in the favorable range, adjust charge for line set

temperature.

cycle,

refer

to the

Heating check Chart on outdoor unit. This chart indicates whether
a correct relationship
exists between system operating
pressure and

8. If unit has a higher suction
temperature,
add refrigerant
reached.

line temperature
than charted
until charted temperature
is

air temperature
entering indoor and outdoor units. If pressure and
temperature
do not match on chart, system refrigerant charge may

9. If unit

line

not be correct.
NOTE:

Do not use chart to adjust

When

charging

nmst be weighed
3/8-in.

liquid

To calculate

is necessary

in accordance

line above
additional

refrigerant

during

heating

charge.
season,

or below 25 ft. (7.6 m) respectively.
for a 35-ft.

(11 m) line set:

35 ft. (10.6 m) - 25 ft. (7.6 m) = 10 ft. X 0.6 oz./ft.
additional charge.
CHECK

CHARGE

METERING

- UNITS

WITH

TXV

reclaim

suction

refrigerant

temperature

than charted

until charted

temperature

is

charge

with unit rating plate ---0.6 oz./ft, of

charge required

has a lower

temperature,
reached.

= 6 oz. of

10. When adding refrigerant,
charge in liquid form into suction
service port using a flow-restricting
device.
11. If outdoor
air temperature
or pressure
at suction
valve
changes, charge to new suction line temperature
indicated
on chart.

COOLING

MAINTENANCE

DEVICE

Factory charge amount and desired subcooling
are shown on unit
rating plate. Charging method is shown on information
plate inside
unit. To
favorable

properly
check
for subcooling

or adjust
charging.

charge, conditions
must be
Favorable
conditions
exist

ELECTRICAL

SHOCK

HAZARD

when the outdoor temperature
is between 70°F and 100°F (21°C
and 38°C), and the indoor temperature
is between 70°F and 80°F

Failure to follow
injury or death.

(21°C

Before installing, modifying,
or servicing
electrical
disconnect
switch
must be

and 27°C).

Follow

Unit is factory charged
by adding or removing

the procedure

below:

for 15 ft (4.6 m) of line-set. Adjust charge
0.6 oz/ft of 3/8 liquid line above or below

For standard refrigerant
line lengths (80 ft/24 m or less), allow
system to operate in cooling mode at least 15 nfinutes. If conditions
are favorable,
check system charge by subcooling
method. If any
adjust charge slowly and allow system to
to stabilize before declaring
a properly

If the indoor temperature
is above 80°F (27°C), and the outdoor
temperature
is in the favorable
range, adjust system charge by
weight

based

There

may be more

could

result

on line length

and allow

drop to 80°F (27°C) before attempting
subcooling
method as described above.

the indoor

temperature

to check system

charge

to
by

in personal

system,
in the

than 1 disconnect

Lock out and tag switch with a suitable

15 ft (4.6 m) respectively.

adjustment
is necessary,
operate for 15 nfinutes
charged system.

position.

this warning

warning

main
OFF

switch.
label.

LUBRICATION
Compressor
Compressor
contains factory
Mobile 3MA-POE
oil.
CLEANING

COILS

Coil

be

should

washed

oil charge;

out

with

replace

water

or

oil when

blown

lost. Use

out

with

compressor
air. Note that the blow-thru
design causes dirt and
debris to build up on the inside of the coils. Clean coil annually or
as required by location and outdoor
air conditions.
Inspect coil
monthly
and clean as required.
Fins are not continuous
through

coilsections.
Dirt anddebrismaypassthrough
firstsection,
become
trapped
between
therowof finsandrestrict
condenser
airflow.
Useaflashlight
todetermine
if dirtordebris
hascollected
between
coilsections.
Clean
coilasfollows:
1.Turnoffunitpower.

2.Using
agarden
hose
orother
suitable
equipment,
flushcoil
fromtheoutside
toremove
dirt.Besure
toflushalldirtand
debris
fromdrainholes
inbase
ofunit.Fanmotors
arewaterproof.

Table
1--Superheat
Charging
OUTDOOR
TEMP
°F
(° C)
55

EVAPORATOR

(13)
60
(16)
65
(18)
70
(21)
75

ENTERING AIR TEMPERATURE

° F (° C) WB

50
(10)
9

52
(11)
12

54
(12)
14

56
(13)
17

58
(14)
20

60
(16)
23

62
(17)
26

64
(18)
29

66
(19)
32

68
(20)
35

70
(21)
37

72
(22)
40

74
(23)
42

76
(24)
45

(-13)
7
(-14)

(-11)
10
(-12)
6
(-14)

(-10)
12
(-11)
10
(-12)
7
(-14)

(-8)
15
(-9)
13
(-11)
10
(-12)
6

(-7)
18
(-8)
16
(-9)
13
(-11)
9

(-5)
21
(-6)
19
(-7)
16
(-9)
12

(-3)
24
(-4)
21
(-6)
19
(-7)
15

(-2)
27
(-3)
24
(-4)
21
(-6)
18

(0)
30
(-1)
27
(-3)
24
(-4)
21

(2)
33
(1)
30
(-1)
27
(-3)
24

(3)
35
(2)
33
(1)
30
(-1)
28

(4)
38
(3)
36
(2)
33
(1)
31

(6)
40
(4)
38
(3)
36
(2)
34

(7)
43
(6)
41
(5)
39
(4)
37

(-14)

(-13)
5

(-11)
8

(-9)
12

(-8)
15

(-6)
18

(-4)
21

(-2)
25

(-1)
28

(1)
31

(3)
35

(-15)

(-13)

(-11)
8
(-13)
5
(-15)

(-9)
11
(-12)
9
(-13)
6

(-8)
15
(-9)
13
(-11)
10

(-6)
19
(-7)
16
(-9)
14

(-4)
22
(-6)
20
(-7)
18

(-2)
26
(-3)
24
(-4)
22

(-1)
30
(-1)
27
(-3)
25

(2)
33
(1)
31
(-1)
29

(-14)

(-12)
8

(-10)
12

(-8)
15

(-6)
20

(-4)
23

(-2)
27

(-13)
5
(-15)

(-11)
9
(-13)
6
(-14)

(-9)
13
(-11)
11
(-12)
8

(-7)
17
(-8)
15
(-9)
14

(-5)
22
(-6)
20
(-7)
18

(-3)
26
(-3)
25
(-4)
23

(24)
80
(27)
85
(29)
90
(32)
95
(36)
100
(38)
105
(41)
110
(43)
115

(47)
Where a dash (-) appears, do not attempt to charge system under these conditions
NOTE: Superheat °F (°C) is at low-side service port.

Table
SUPERHEAT

2--Required
SUCTION

TEMP(°F/°C)

107,8

0/-

18

35

2/-

17

4/-

112,2

or refrigerant slugging

Suction-Line
PRESSURE

(- 5)

Temperature

AT SERVICE
126,0

(- 13)
(- 10)
(- 8)
may occur. Charge must be weight in.

PORT
130,8

(PSIG)

116,8

121,2

37

39

41

46

45

138,8
47

140,8
49

145,8
51

37

39

41

43

45

47

49

51

56

16

39

41

46

45

47

49

51

56

55

6/-

14

41

46

45

47

49

51

56

55

57

8/-

16

46

45

47

49

51

56

55

57

59

10/-

12

45

47

49

51

56

55

57

59

61

12/-

11

47

49

51

56

55

57

59

61

66

14/-

10

49

51

56

55

57

59

61

66

65

16/-

9

51

56

55

57

59

61

63

65

67

18/-

8

56

55

57

59

61

63

65

67

69

20/-

7

55

57

59

61

66

65

67

69

71

22/-

6

57

59

61

63

65

67

69

71

73

24/-

4

59

61

66

65

67

69

71

76

75

26/-

3

61

63

65

67

69

71

73

75

77

28/-

2

66

65

67

69

71

76

75

77

79

30/-

1

65

67

69

71

76

75

77

79

81

32/0

67

69

71

76

75

77

79

81

86

34/1

69

71

76

75

77

79

81

86

85

36/2

71

76

75

77

79

81

86

85

87

38/3

73

75

77

79

81

83

85

87

89

40/4

75

77

79

81

86

85

87

89

91

TROUBLESHOOTING

NO HEATING OR
INSUFFICIENT
HEATING

COMPRESSOR
WILL NOT RUN

1
CONTACT

-_[

OPEN

T

I

[

RUNS
INSUFFICIENT
COMPRESSOR
HEATING

RUNS BUT
CYCLES ON
INTERNAL
COMPRESSOR
OVERLOAD

--

]

[
_'_"

CONTADTOR
CLOSED

VOLTAGE

.._

_._

_.

DEFECTIVE
TRANSFORMER LOW-

POWER SUPPLY
OMPRESSOR
OPEN

COIL OPEN OR
CONTACTOR
SHORTED

_[

LOOSE
COMPRESSOR
LEADS AT

OPENIN[_OR
THERMOSTAT

_[

FAULTY
START
GEAR (1PH)

PRESSURE
SWITCH
LIQUID-LINE
OPEN

•"_

COMPRESSOR
STUCK

_[

DIRTY
FILTERS
OR
INDOOR
COtL l

--

RESTRICTION LINE
tN
DISCHARGE

_.{_

OR NONCONDENSABLES
OVERCHARGE
IN SYSTEM

OF CHARGE

._

_[

LOOSE LEADS AT
FAN MOTOR

FAN MOIOR
BURNED
OUT

l

.__[

_{

_[

_{

OPENCIRCUIT
CONTROL

]

OR GROUNDED
.__'OPEN,COMPRESSOR
SHORTED'
MOTOR

t

"_

1

|

OUTDOOR PAN
LOOSE
MOTOR
LEADS AT 1

FAN MOTOR
OVERLOAD
INTERNAL
OPEN

BURNED
FAN MOTOR
OUT

i

REFRIGERANT
CHARGE

OVERLOAD
COMPRESSOR OPEN

,_[

OUTDOOR
RUNNING FAN

REVERSING
VALVE
STUCK

DOT SETTING
TOO LOW

_[

RESTRICTED
LIQUID LINE

CAP TUBE
PINCHED OR
BULB NOT
SENSING TRUE
OUTDOOR TEMP

_[

PISTON
_RESTRICTED
ACCURATER®
OR CLOGGED

NC
CONTACTS
OPEN
ON CIRCUIT
DEFROST
RELAY
BOARD

TOO HIGH OR
UNE LOW
VOLTAGE

_[

CAPACITOR
DEPBDTIVB
(1 -PH) RUN

'_

OUTDOOR
DIRTY COIL

RELAY OR
CONTACTOR
STRIP HEATER
DEFECTIVE

_[

UNDER*
CHARGED

WtNOtN_S__J

DEFECTIVE
CAPACITORRUN

POWER CIRCUIT
TO HEATER
_ENTS OPENINGIN

1

RESTRICTED
STRAINER

-_

OUTDOOR COIL
HEAVtLY
FROSTED

BEARINGS
COMPRESSOR
FAULTY

CONTACTS
WELDED CLOSED
IN
FANDEFROST
MOTOR
RELAY

CONDmON
HIGH*LOAD

VALVE JAMMED
tN MIDPOSITION

_[
t

BRGKEN
ELEMENT
HEATER

]

]

J

__[

TEMPERATURE
OPEN OVERTHERMOSTAT

-DEFECTIVE

DEFROST
DEFECTIVE
TRERMDSTAT

I

ROOM

(T2HNEDR
M TOAST
E_)T._

THERMOSTATIN

VALVE DID NOT
REVERSING
SHIFT

POOR
f

SUPERHEAT
HIGH

]

BROKEN FUSE
LINK

_

._

]

__.____J

REVERSING
VALVE

4L

1

STRIP HEATERS
NOT OPERATING

k

MOTOR
CAPACITOR
DEFECTIVE FAN

4°-°1

INTERNAL

m_LOSS

STOPPED OR
CYCLING ON
INDOOR FAN
OVERLOAD

1

LOW SUCTION
LOW HEAD

I
...t

1

i

PHYSICAL

CONTACT
WITH
DEFROST
TUBE

PROPERLY
CHARGED
UNIT NOT

]

-_

C_RGUtTBOARD
DEFECTIVE

CONNECTION
ANYWHEREIN
BAD ELECTRICAL
DEFROST
CIRCUIT

l

LEGEND
NC
ODT

---

Normally Closed
Outdoor Thermostat

NOTE: For systems with indoor units equipped with microprocessor
control, see separate controls, service, and troubleshooting manual.
A07435

Fig. 10 - Troubleshooting

the Cooling

Cycle

TROUBLESHOOTING

(CONT.)

INSUFFiCiENT
NO COOLING OR

[

!

1

£

POWER SUPPLY
COMPRESSOR
OPEN

LOW-VOLTAGE
TRANSFORMER
DEFECTIVE

l
COMPRESSOR
RUNS BUT
INSUFFICIENT
COOLING

COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD

i

I

[

__{

t

WILL
NOT RUN
COMPRESSOR

I

]

I

]

_[

STOPPED OR
CYCUNGON
OUTDOOR
OVERLOADFAN

jL_

RESTRICTED
OR
RECIF_CULATING
OUTDOOR
AIR

1

--_

LOOSE
FAN MOTOR
LEAD AT

I

LOW
PRESSURE
SUCTION

1

l

LOW READ
HIGH
PRESSURE
SUCTION

I RIGRSUOTiDN
1
LOW SUPERHEAT

__[
NC

CONTACTS

=_

DEFROST OPEN RELAYS

•_[

DEFECTIVE
MOTOR

]

_-[

DIRTY
AIR
FILTERS

._

__]
VALVE HUNG UP
OR INTERNAL
REVERSING
LEAK

OVERCHARGED

[_
"_[

_{_

OPENCIRCUIT
CONTROL

]

_-[

LOSS OF CHARGE

]

STUCK
REVERSING
DAMAGED
OR
VALVE

LOOSE
COMPRESSOR
LEADS AT ]

_{

START
(!-PH)

FAULTY
GEAR

DISCHARGE
RESTRICTEDTUBE

OR GROUNDED
COMPRESSOR
_[

q

ELECTRICAL
CONNECTION
LOOSE

_[_

___

OPEN, MOTOR
SHORTED,
WINDINGS

-_

_{INOORRECT
CAPACITOR OFM

OR NONCONDENSABLES
OVERGHARGE
IN SYSTEM

__{

DEFPOST
THERMOSTAT
DEFECTIVE

]

COMPRESSOR
DEFECTIVE
VALVES

RESTRICTED
DUCT

PARTLY
DAMPERS
CLOSED

}

INDOOR
FROSTED
COIL

]

SLIGHTLY
LIQUID LINE
RESTRICTED

1

*-_

==_

PRESSURE
RELIEF
_NTERNAL
OPEN

1

UNIT
ACCURATER
'NCORRECT
PISTON

1

1

1

REFRIGERANT
CHARGE
LOW

COMPRESSOR
STUCK

__

INTERNAL
PROTECTION
COMPRESSOR
OPEN

-_

DEFECTIVE
CAPAC_OR RUN

_{_

TOO HIGH OR
LINE LOW
VOLTAGE

DEFECTIVE
CAPAC_OR RUN

]

t

RESTRICTED
ACCURATEN®

BEARINGS
___

COMPRESSOR
=¢ULTY

]

__[

ACCURATER
INCORRECT
PISTON

I

STRAINER
IN
RESTRICTED
DOOR COiL

MOTOR
DEFECTIVE

OR

CYCLING BLOWER
ON
INDOOR
OVERLOAD

l

LEGEND
NC
ODT

---

Normally Closed
Outdoor Thermostat

NOTE: For systems with indoor units equipped with microprocessor
control, see separate controls, service, and troubleshooting manual.
A07436

Fig. 11 - Troubleshooting
Always

Copyright

Manufacturer

2010

Ask

Carrier

Corp.

*

reserve8

the

right

the Heating

Cycle

For

7310

to

W. Morris

change,

St.

at any

*

Indianapolis,

time,

IN

specification8

46231

and

Printed

design8

without

in U.S.A.

notice

Edition

and

without

10

obligations.

Date:07/i0

Catalog

No: 38QRR-6Sl
Replaces:

38QRR-5SI



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Page Layout                     : SinglePage
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