INSTALLATION INSTRUCTIONS
R−410A Horizontal Split System Heat Pumps
NH4H4
These instructions must be read and understood completely before attempting installation.
A07532
Fig. 1 - NH4H4
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1........................
INSTALLATION 2−4.................................
Complete Pre−Installation Checks 2...................
Rig and Mount Unit 2..............................
Complete Refrigerant Piping Connections 3.............
Make Electrical Connections 4........................
START−UP 4........................................
SERVICE 5.........................................
MAINTENANCE 7−9.................................
SAFETY CONSIDERATIONS
Improper installation, 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 instructions
packaged with the kits or accessories when installing.
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 editions of the National Electrical Code (NEC)
NFPA70.
In Canada, refer to the current editions of the Canadian Electrical
Code CSA C22.1.
Recognize safety information. This is the safety−alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
the signal words DANGER, WARNING, and CAUTION. These
words are used with the safety−alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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.
WARNING
.
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
pollution.
Remove and recycle all components or materials (i.e. oil,
refrigerant, etc.) before unit final disposal.
CAUTION
428 01 9702 01 02/25/15
INSTALLATION
IMPORTANT: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
!
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
Check AccuRater Metering Device − Heating Mode
The correct AccuRater (bypass type) refrigerant control is required
for system capacity optimization. An AccuRater device with
field−replaceable piston is supplied with the outdoor unit (see Fig.
2).
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 refrigerant lines. See Fig. 2. Piston replacement
instructions are included in the indoor unit installation instructions.
After system installation is complete, see the Refrigerant Charging
section in this document to check and/or adjust refrigerant charge.
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
R−410A refrigerant systems operate at higher pressures than
standard R−22 systems. Do not use R−22 service equipment
or components on R−410A refrigerant equipment.
PERSONAL INJURY AND EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and / or equipment damage.
DO NOT operate the unit without a filter or with grille
removed.
WARNING
!
CAUTION
COMPLETE PRE−INSTALLATION CHECKS
Unpack Unit
Move the unit to final location. Remove unit from carton, being
careful not to damage service valves and grilles.
Inspect Shipment
File a claim with the shipping company if shipment is damaged or
incomplete. Check the unit nameplates to ensure units match job
requirements.
Consider System Requirements
Consult local building codes and NEC for special installation
requirements.
Allow sufficient space for airflow clearance, wiring, refrigerant
piping, and servicing unit. Locate unit so that condenser airflow is
unrestricted on both sides.
Unit may be mounted on a level pad directly on base legs or
mounted on raised pads at support points.
Matching the Heat Pump to an Indoor Unit
The NH4H4 heat pump units can be matched to corresponding
indoor units. The NH4H4 unit can be matched with under−ceiling
and residential fan coils and evaporator coils. Refer to separate
indoor unit literature for more information.
Expansion Device − Ducted System Cooling 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.
*
*NOTE: Piston Orientation - Install tapered end
of piston in the direction of the outdoor equipment
for proper heating operation
A07407b
Fig. 2 - AccuRater (bypass type)
Metering Device Components
RIG AND MOUNT UNIT
Mounting on Ground
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
snow stand or ice rack where prolonged subfreezing temperatures
or heavy snow occurs.
If conditions or local codes require unit be fastened to a pad, 6
field−supplied tie−down bolts should be used and fastened through
slots provided in unit mounting feet.
Mounting on Roof
Mount unit on a level platform or frame at least 6 in. (152.4 mm)
above roof surface. Isolate unit and tubing from structure.
Clearance Requirements
Single Unit Applications: With coil facing wall: Allow 6” (152.4
mm) minimum clearance on coil side and coil end and 20” (504.0
mm) minimum clearance on fan side. Allow 24” (609.6 mm)
minimum clearance on compressor end for service.
With fan facing wall:
fan side and coil end and 20” (504.0 mm) minimum clearance on
coil side. Allow 24” (609.6 mm) minimum clearance on
compressor end for service when units are stacked or there is less
than 40” (1016 mm) of clearance above the unit. If there is 40”
(1016 mm) clearance above unit and the top panel is accessible for
removal allow 8” (203.2 mm) minimum clearance on compressor
end for service.
Multi−unit Applications:
clearance between fan and coil sides of multiple units. Arrange
units so discharge of one does not enter inlet of another. Allow 24”
(609.6 mm) minimum clearance on compressor end when units are
stacked or there is less than 40” (1016 mm) of clearance above the
unit. If there is 40” (1016 mm) clearance above unit and the top
panel is accessible for removal allow 8” (203.2 mm) minimum
clearance on compressor end for service.
When two units are installed end to end with the coil ends facing
each other allow 12” (304.8 mm) minimum clearance between
units.
IMPORTANT: When installing multiple units, ensure the
discharge air from one unit is not drawn into another unit. When
installing single or multiple units in an alcove, roof well, or
partially enclosed area, ensure there is adequate ventilation to
prevent recirculation of discharge air.
Allow 8” (203.2 mm) minimum clearance on
Allow 24” (609.6 mm) minimum
2 428 01 9702 01
Specifications subject to change without notice.
Operating Ambient
Minimum outdoor operating ambient in cooling mode is 55_F
(13_C), maximum 125_F (52_C).
Rigging
!
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this caution may result in personal injury
and/or equipment damage.
Be sure unit panels are securely 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 instructions provided with the accessory kit.
NOTE: Accessory wind baffles should be used on all units with
accessory low ambient temperature control.
Field−fabricated snow or ice stands may be used to raise unit when
operation will be required during winter months. Units may also be
wall mounted using the accessory wall mounting kit.
CAUTION
Long Line Application Guide for required accessories. If either
refrigerant tubing or indoor coil is exposed to the atmosphere, the
system must be evacuated following good refrigeration practices.
Run refrigerant tubes as directly as possible, avoiding unnecessary
turns and bends. Suspend refrigerant tubes so they do not damage
insulation on vapor tube and do not transmit vibration to structure.
Also, when passing refrigerant tubes through a wall, seal the
opening so that vibration is not transmitted to structure. Leave
some slack in refrigerant tubes between structure and outdoor unit
to absorb vibration. Refer to separate indoor unit installation
instructions for additional information.
Filter Drier
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5 in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. (127 mm) long liquid tube from
step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
A07396
Fig. 3 - Lifting Unit with Sling
COMPLETE REFRIGERANT PIPING
CONNECTIONS
Outdoor units may be connected to indoor units using
field−supplied tubing of refrigerant grade and condition. See
Specification Sheet for correct line sizes. Do not use less than 10 ft
(3.05 m) of interconnecting tubing.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If any section of pipe is buried, there must be a 6 in. (152.4
mm) vertical rise to the valve connections on the outdoor
unit. If more than the recommended length is buried,
refrigerant may migrate to cooler, buried section during
extended periods of system shutdown. This causes refrigerant
slugging and could possibly damage the compressor at
start−up.
When more than 80 ft (24.4 m) of interconnecting tubing and more
than 20 ft (6.1 m) of vertical lift is used, consult the residential
CAUTION
A05227
Fig. 4 - Filter Drier Components
The filter drier must be replaced whenever the refrigeration system
is exposed to the atmosphere.
Only use factory specified liquid−line filter driers with rated
working pressures less than 600 psig.
NOTE: Do not install a suction−line filter drier in liquid line.
Make Piping Sweat Connections
!
WARNING
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
Remove plastic caps from liquid and suction service valves. Use
refrigerant grade tubing. Service valves are closed from the factory
and are ready for brazing. After 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
coil are now ready for leak testing.
NOTE: Unit is shipped with R−410A refrigerant factory charge
indicated on nameplate.
Pass nitrogen or other inert gas through piping while brazing to
prevent formation of copper oxide.
428 01 9702 01 3
Specifications subject to change without notice.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves observe the
following:
S Use a brazing shield.
S Wrap service valves with wet cloth or use a heat sink
material.
CAUTION
MAKE ELECTRICAL CONNECTIONS
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault should
occur. The ground may consist of electrical wire or metal
conduit when installed in accordance with existing electrical
codes.
WARNING
LEGEND
NEC — National Electrical Code
TB — Ter mi na l B oa rd
——
TB Connections
Field Wiring
Factory Wiring
Fig. 5 - Line Power Connections
Control Circuit Wiring
Control voltage is 24 v (40 va minimum). See Fig. 6 and unit label
diagram for field−supplied wiring details. Route control wire
through opening in unit side panel to connection in unit control
box.
A07428
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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 warranty.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
Before performing service or maintenance, be sure indoor unit
main power switch is turned OFF and indoor blower has
stopped.
Power Wiring
Unit is factory wired for voltage shown on nameplate. Provide
adequate, fused disconnect switch within sight from unit, readily
accessible, but out of reach of children. Provision for locking the
switch open (off) is advisable to prevent power from being turned
on while unit is being serviced.
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 connection.
Route power wires through the opening in unit side panel and
connect in the unit control box as shown on the unit label diagram
and Fig. 5. Unit must be grounded.
CAUTION
WARNING
Fig. 6 - NH4H4 Typical Control Circuit Connections
A07429
NOTE: Use No. 18 AWG color−coded, insulated (35_C
minimum) wire. If thermostat is located more than 100 ft. (30.5 m)
from unit, as measured along the control voltage wires, use No. 16
AWG color−coded wire to avoid excessive voltage drop.
NOTE: All wiring must conform to NEC and local codes.
NOTE: Operating unit on improper line voltage constitutes abuse
and could affect warranty. See Specification Sheet. Do not install
unit in a system where voltage may fluctuate above or below
permissible limits.
Refer to the Specification Sheet for recommended fuse sizes. When
making electrical connections, provide clearance at the unit for
refrigerant piping connections.
NOTE: The NH4H4 units use the control transformer supplied
with the matched indoor unit.
START−UP
PRELIMINARY CHECKS
1. Check that all internal wiring connections are tight and that
all barriers, covers, and panels are in place.
2. Field electrical power source must agree with unit nameplate rating.
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
Field piping and fan coil must be evacuated and dehydrated.
CHARGE SYSTEM
Release charge into system by opening (back−seating) liquid and
suction line service valves. Outdoor unit is charged for 15 ft (4.6
m) of 3/8−in. liquid line.
TO START UNIT
Be sure that the field disconnect is closed. Set room thermostat
below ambient temperature. Operate unit for 15 minutes, then
check system refrigerant charge. See Refrigerant Charging section.
4 428 01 9702 01
Specifications subject to change without notice.
SERVICE
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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.
High−Pressure Relief Valve
The high−pressure relief valve is located in the compressor. The
relief valve opens at a pressure differential of approximately 550 to
625 50 psig between suction (low side) and discharge (high side)
to allow pressure equalization.
Internal Current and Temperature Sensitive Overload
The control resets automatically when internal compressor motor
temperature drops to a safe level (overloads may require up to 45
minutes to reset). When an internal overload is suspected of being
open, check by using an ohmmeter or continuity tester.
Pumpdown Procedure
The system may be pumped down in order to make repairs on the
low side without losing complete refrigerant charge.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never open system to atmosphere while it is under a vacuum.
When system must be opened for service, recover refrigerant, break
vacuum with dry nitrogen before opening system.
1. Attach pressure gage to suction service valve gage port.
2. Front−seat the liquid/mixed phase line valve.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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 front−seat the suction valve and remove
and recover excess refrigerant following accepted practices
3. Start unit and run until suction pressure reaches 20 psig.
4. Shut unit off and front−seat suction valve.
5. De−pressurize low side of unit and recover refrigerant following accepted practices.
High−Pressure Switch
The high−pressure switch, located on discharge line, protects
against high discharge pressures caused by such events as
overcharge, condenser−fan motor failure, system restriction, etc. It
opens on pressure rise at about 670 10 psig. If system pressures
go above this setting during abnormal conditions, the switch
opens.
WARNING
CAUTION
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury or death.
DO NOT attempt to simulate these system
abnormalities − high pressures pose a serious safety
hazard.
The high−pressure switch is checked with an ohmmeter. If system
pressure is below 470 psig switch shows continuity.
Crankcase Heater
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, both compressor service valves must 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
thermostatically controlled.
!
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury
or death.
Use extreme caution when troubleshooting this device as
line voltage is continually present.
To troubleshoot:
1. Apply voltmeter across crankcase heater leads to see if heater 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
The service valves in the outdoor unit come from the factory
front−seated. This means the refrigerant charge is isolated from the
line−set connection ports. To prevent damage to the valve, use a
wet cloth or other accepted heat sink material on the valve before
brazing.
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 Controls
The control, which consists of defrost control board and defrost
thermostat, interrupts the normal system heating operation to
defrost the outdoor coil, if the coil saturated suction temperature
indicates freezing temperatures. Defrost control board can be field
set to check need for defrost every 30, 50, or 90 minutes of
operating time, by connecting the jumper (labeled W1, on the
circuit board) to the spade terminal for the defrost time desired. The
board is factory set for 60 minutes. The defrost period is field
selectable, depending upon geographic areas and defrost demands.
Control board has additional feature that allows unit to restart in
defrost cycle if room thermostat is satisfied during defrost. Defrost
control simultaneously tops outdoor fan, energizes reversing valve
solenoid to return system to cooling cycle (outdoor unit as
condenser, indoor unit as evaporator), and activates accessory
electric heater.
WARNING
WARNING
428 01 9702 01 5
Specifications subject to change without notice.
The defrost timer limits defrosting period to 10 minutes. Normally,
the frost is removed and the defrost thermostat contacts open to
terminate defrosting before 10 minutes have elapsed. When
defrosting is terminated, the outdoor−fan motor is energized, and
reversing valve solenoid is de−energized, returning unit to heating
cycle.
Reversing Valve
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. Check for continuity and shorting to
ground. With control circuit (24 v) power on, check for correct
voltage at solenoid coil, and for burned or overheated solenoid.
With unit operating, other items can be checked, such as frost or
condensate on refrigerant lines.
Using a remote measuring device, check inlet and outlet line
temperatures. Do not touch lines. If reversing valve is operating
normally, inlet and outlet temperatures on appropriate lines should
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 7 and 8 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 with a wet rag to prevent
overheating while brazing).
5. After valve is brazed in, check for leaks.
6. Evacuate and charge system. Operate system in both modes
several times to be sure valve functions properly.
LEGEND
TP — Test Point
A07433
Fig. 7 - Reversing Valve
(Cooling Mode or Defrost Mode, Solenoid Energized)
LEGEND
TP — Test Point
A07434
Fig. 8 - Reversing Valve
(Heating Mode, Solenoid De−energized)
Refrigerant Charging
!
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in personal injury
and/or equipment damage.
Wear safety glasses and gloves when handling refrigerant.
Do not overcharge system − this can cause compressor
flooding.
!
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in personal injury
and/or equipment damage.
Service valves must be fully back−seated to close service
port. There is no Schrader valve at the service port, and
failure to back−seat the valve could result in loss of system
charge or personal injury.
NOTE: Do not vent or de−pressurize unit refrigerant to
atmosphere. Remove and recover refrigerant following accepted
practices.
All units are shipped with the refrigerant charge listed on the
nameplate.
Refer to Specification Sheet and consider the following when
working with R−410A refrigerant:
WARNING
WARNING
S R−410A refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400
psig, DOT (Department of Transportation) 4BA400 or
DOT BW400.
S R−410A 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.
S Manifold sets should be 700 psig high side and 180 psig
low side with 550 psig low−side retard.
S Use hoses with 700 psig service pressure rating.
S R−410A refrigerant, as with other HFCs, is only compat-
ible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Polyol Ester oils absorb moisture rapidly. Do not expose oil
to atmosphere.
S Polyol Ester oils may cause damage to certain plastics and
roofing materials.
S Wrap all filter driers and service valves with wet cloth when
brazing.
S factory approved, liquid−line filter drier is required on ev-
ery unit.
S 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.
S If using a suction line drier, do not leave in place for more
than 72 hours.
6 428 01 9702 01
Specifications subject to change without notice.
Heating Check Chart Procedure − Heating Mode
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates whether
a correct relationship exists between system operating pressure and
air temperature entering indoor and outdoor units. If pressure and
temperature do not match on chart, system refrigerant charge may
not be correct. Do not use chart to adjust refrigerant charge.
NOTE: When charging is necessary during heating season, charge
must be weighed in accordance with unit rating plate 0.6 oz./ft. of
3/8−in. liquid line above or below 25 ft. (7.6 m) respectively.
To calculate additional charge required 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. = 6 oz. of
additional charge.
CHECK CHARGE − UNITS WITH TXV COOLING
METERING DEVICE
Factory charge amount and desired subcooling are shown on unit
rating plate. Additional subcooling may be required to achieve
optimal heating performance based on the installed indoor unit.
(see Table 1).
Charging method is shown on information plate inside unit. For
TXV, use subcooling method. For piston, use superheat method.
To properly check or adjust charge, conditions must be favorable
for subcooling or superheat charging. Favorable conditions exist
when the outdoor temperature is between 70F and 100F
(21.11C and 37.78C), and the indoor temperature is between
70F and 80F (21.11C and 26.67C). Follow the procedure
below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft (.018 kg/m) of 3/8 liquid line
above or below 15ft (4.57 m) respectively. For standard refrigerant
line lengths (80 ft/24.38 m or less), allow system to operate in
cooling mode at least 15 minutes. If conditions are favorable,
check system charge by super heat method for fixed metering
device and subcooling method for TXV. If any adjustment is
necessary, adjust charge slowly and allow system to operate for 15
minutes to stabilize before declaring a properly charged system.
Refer to Table 1 for additional subcooling required.
If the indoor temperature is above 80F (26.67C), and the outdoor
temperature is in the favorable range, adjust system charge by
weight based on line length and allow the indoor temperature to
drop to 80F (26.67C) before attempting to check system charge
by subcooling method as described above.
If the indoor temperature is below 70F (21.11C), or the outdoor
temperature is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 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 temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20
ft (6.10 m) vertical separation, See Residential Piping and Long
Line Guideline for special charging requirements.
Units with Indoor Pistons
Units installed with indoor pistons require charging by the
superheat method. The following procedure is valid when indoor
airflow is within 21% of its rated CFM.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure suction pressure by attaching an accurate gauge to
suction valve service port.
3. Measure suction temperature by attaching an accurate
thermistor type or electronic thermometer to suction line at
service valve.
4. Measure outdoor air dry−bulb temperature with
thermometer.
5. Measure indoor air (entering indoor coil) wet−bulb
temperature with a sling psychrometer.
6. Refer to Table 2. Find outdoor temperature and evaporator
entering air wet−bulb temperature. At this intersection, note
superheat.
7. Refer to Table 3. Find superheat temperature located in item
6 and suction pressure. At this intersection, note suction line
temperature.
8. If unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is
reached.
9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.
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.
MAINTENANCE
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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.
LUBRICATION
Compressor
Compressor contains factory oil charge; replace oil when lost. Use
Mobile 3MA−POE oil.
CLEANING COILS
Coil should be washed out with water or blown 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
coil sections. Dirt and debris may pass through first section,
become trapped between the row of fins and restrict condenser
airflow. Use a flashlight to determine if dirt or debris has collected
between coil sections. Clean coil as follows:
1. Turn off unit power.
2. Using a garden hose or other suitable equipment, flush coil
from the outside to remove dirt. Be sure to flush all dirt and
debris from drain holes in base of unit. Fan motors are waterproof.
WARNING
428 01 9702 01 7
Specifications subject to change without notice.
Table 1—Horizontal Discharge Outdoor Units − Adjusted Subcooling
Indoor Unit
018 024 030 036 048 060
EA*4X18*14A* ––
EN(A,D)4X18*14A** ––
FEM4X18**B* ––
FMA4X18**A* ––
FM(C,U)4X18**A* ––
FXM4X18**A* ––
EA*4X24***A* –– ––
EN(A,D)4X24***A** –– ––
EHD4X24A** ––
FEM4X24**B* ––
FMA4X24**A* ––
FVM4X24**** +3 +3 –– ––
FXM4X24**A* –– ––
EA*4X30***A* –– ––
EN(A,D)4X30***A** –– ––
EHD4X30A** –– ––
FEM4P30**A*+TXV ––
FEM4X30**B* –– ––
FMA4P30**A*+TXV ––
FMA4X30**A* ––
FM(C,U)4P30**A*+TXV ––
FM(C,U)4X30**A* ––
FXM4X30**A* +3 ––
FS(M,U)4P30**A*+TXV ––
EA*4X36***A* –– ––
EN(A,D,W)4X36***A** –– ––
EHD4X36A** –– ––
FEM4P36**A*+TXV –– ––
FEM4X36**B* –– ––
FMA4X36**A* –– ––
FM(C,U)4P36**A*+TXV ––
FVM4X36**** +3 –– ––
FXM4X36**A* +5 –– ––
FS(M,U)4P36**AL+TXV –– ––
EA*4X42***A* ––
EN(A,D,W)4X42*21A** ––
END4X42*17** ––
EHD4X42A** ––
FEM4P42**A*+TXV ––
FEM4X42**B* ––
FXM4X42**A* –– ––
FS(M,U)4P42**A*+TXV ––
EA*4X48*17A* +5
EA*4X48*(21,24)A* +3
EN(A,D,W)4X48***A** ––
EHD4X48A** ––
FEM4P48**A*+TXV ––
FEM4X48**B* ––
FVM4X48**** +5 +5 +3
FXM4X48**A* +5 +3
EA*4X60***A* +5
EN(A,D,W)4X60*24A** +3
EHD4X60A** +3
FEM4X60**B* +3
FVM4X60**** +5 +5
FXM4X60**A* +5 ––
Subcooling Delta from Rating Plate Value
Outdoor Unit Tonnage
8 428 01 9702 01
Specifications subject to change without notice.
Table 2—Superheat Charging
OUTDOOR
TEMP
°F
(°C)
55
(13)9(-13)12(-11)14(-10)17(-8)20(-7)23(-5)26(-3)29(-2)
60
(16)7(-14)10(-12)12(-11)15(-9)18(-8)21(-6)24(-4)27(-3)30(-1)
65
(18)
70
(21)
75
(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 or refrigerant slugging may occur. Charge must be weight in.
NOTE: Superheat _F (_C) is at low-side service port.
50
(10)
—
— —
— — —
— — — —
— — — — — —
— — — — — —
— — — — — — —
— — — — — — — —
— — — — — — — —
— — — — — — — — —
— — — — — — — — — —
52
(11)
6
(-14)10(-12)13(-11)16(-9)19(-7)21(-6)24(-4)27(-3)30(-1)
54
(12)
7
(-14)10(-12)13(-11)16(-9)19(-7)21(-6)24(-4)27(-3)30(-1)
(-14)9(-13)12(-11)15(-9)18(-8)21(-6)24(-4)28(-2)31(-1)
EVAPORATOR ENTERING AIR TEMPERATURE °F (°C) WB
56
(13)
6
58
(14)
5
(-15)8(-13)12(-11)15(-9)18(-8)21(-6)25(-4)28(-2)31(-1)
60
(16)
62
(17)
8
(-13)11(-12)15(-9)19(-7)22(-6)26(-3)30(-1)
5
(-15)9(-13)13(-11)16(-9)20(-7)24(-4)27(-3)31(-1)
64
(18)
6
(-14)10(-12)14(-10)18(-8)22(-6)25(-4)29(-2)
66
(19)
32
(0)
8
(-13)12(-11)15(-9)20(-7)23(-5)27(-3)
5
(-15)9(-13)13(-11)17(-8)22(-6)26(-3)
68
(20)
35
(2)
33
(1)
6
(-14)11(-12)15(-9)20(-7)25(-4)
70
(21)72(22)
37
(3)
35
(2)
33
(1)
8
(-13)14(-10)18(-8)23(-5)
40
(4)
38
(3)
36
(2)
33
(1)
74
(23)
42
(6)
40
(4)
38
(3)
36
(2)
34
(1)
76
(24)
45
(7)
43
(6)
41
(5)
39
(4)
37
(3)
35
(2)
33
(1)
Table 3—Required Suction−Line Temperature
SUPERHEAT
TEMP(5F/5C)
107.8 112.2 116.8 121.2 126.0 130.8 138.8 140.8 145.8
0/-18 35 37 39 41 43 45 47 49 51
2/-17 37 39 41 43 45 47 49 51 53
4/-16 39 41 43 45 47 49 51 53 55
6/-14 41 43 45 47 49 51 53 55 57
8/-13 43 45 47 49 51 53 55 57 59
10/-12 45 47 49 51 53 55 57 59 61
12/-11 47 49 51 53 55 57 59 61 63
14/-10 49 51 53 55 57 59 61 63 65
16/-9 51 53 55 57 59 61 63 65 67
18/-8 53 55 57 59 61 63 65 67 69
20/-7 55 57 59 61 63 65 67 69 71
22/-6 57 59 61 63 65 67 69 71 73
24/-4 59 61 63 65 67 69 71 73 75
26/-3 61 63 65 67 69 71 73 75 77
28/-2 63 65 67 69 71 73 75 77 79
30/-1 65 67 69 71 73 75 77 79 81
32/0 67 69 71 73 75 77 79 81 83
34/1 69 71 73 75 77 79 81 83 85
36/2 71 73 75 77 79 81 83 85 87
38/3 73 75 77 79 81 83 85 87 89
40/4 75 77 79 81 83 85 87 89 91
SUCTION PRESSURE AT SERVICE PORT (PSIG)
428 01 9702 01 9
Specifications subject to change without notice.
10 428 01 9702 01
Specifications subject to change without notice.
Copyright 2015 International Comfort Products
Lewisburg, TN 37091 USA
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