Wall-Mount
OutdoorWall-mounted Air Conditioners/ Heat Pumps
OES/ OHSSeries
Installation & Operation Manual
920-138-02 (3-04)
920-138-02(3-04)
TABLE OF CONTENTS
I. General Specifications
Model Number Identification Guide ............................................................. 3
Unit Dimensions ............................................................................ 3
II. Installation
Introduction ................................................................................ 4
Safety Considerations ........................................................................ 4
Indoor Air Requirements ...................................................................... 5
Filters ..................................................................................... 6
Outdoor Air System .......................................................................... 6
Condensate Drainage ........................................................................ 6
Mounting Preparations ....................................................................... 7
Mounting the Unit ......................................................................... 8-9
Rain Flashing Installation .................................................................... 10
Thermostat Wiring .......................................................................... 11
Line Voltage Electrical Wiring ................................................................. 11
Electrical Data Tables ..................................................................... 12-13
Standard Ventilation Package ................................................................. 14
Optional Ventilation Packages .............................................................. 15-17
III. Start Up
Sequence of Operation ...................................................................... 18
Defrost Cycle (Heat Pump models only) ........................................................ 18
Final Installation Checklist .................................................................... 18
IV. Service / Warranty
Service Hints .............................................................................. 18
Model Information Form ..................................................................... 19
Warranty Information ..................................................................... 20-21
Please read this manual thoroughly prior to equipment installation or operation. It is the installer's responsibility to properly apply
and install the equipment. Installation must be in conformance with the NFPA 70-2002 National Electric Code or current edition
and Universal Mechanical Code current edition and applicable local or national codes.
Remember, proper installation is not difficult but it is essential.
Inspect for Shipping Damage
You should inspect your shipment immediately for signs of external damage. Any damage found should be reported
(preferably in writing) to the last carrier to handle the shipment and a request for inspection by their agent made.
Any hidden damage should also be reported when the unit is unpacked.
920-138-02 (3-04)
I. GENERAL SPECIFICATIONS
Figure 1
BASIC MODEL CONFIGURATION
O S
Family E
O = Friedrich Wall-Mount I
System Type
E = Cooling with or without electric heat
H = Heat Pump
Chassis Designation
S = Standard
Nominal Cooling Capacity
BTU/h
18 = 18.000 36 = 36.000 60 = 60.000
24 = 24.000 42 = 42.000
30 = 30.000 48 = 48.000
Voltage/Phase/Hertz
K = 208/230V - 1 PH - 60HZ
36 K
10 X X
OPTIONS
X X [-A
Engineering Revision Digit
Future Revision Digit
Ventilation Options
X = Manual fresh air damper (standard)
M = Motorized fresh air damper
N = No vent option
E = Economizer
C = Commercial Room Ventilator
Chassis Color
X = Alaskan Beige (standard)
Control Options
X = Standard Controls
Revision Digit
08 = 8.0 KW
Electric Heat - KW Options
00 = Noelectric heat 10 = 10.0 KW
05 = 5.0 KW 15 = 15.0 KW
20 = 20.0 KW
Figure 2 - Unit Dimensions
c
RAIN --P_ --R
SUPPLY AIR [
. OPENING .
]
FILTER
ACCESS
E PANEL
CONTROL
BOX ACCESS
FILTER
ACCESS
CIRCUIT PANEL
BREAKER
ON/OFF
ACCESS L
Q s
VENTILATION = =
ACCESSORY
LOCATION
_ T
.1
ALTERNATE
POWER
ENTRANCE
BACK LEFT SIDE FRONT RIGHT SIDE
lt'#l'], ']li'll_iiIPlil
A B C D E F G 14 I J K L M N 0 P O R S T
36.9 200 6.2 79 20.1 20.0 119 315 285 228 50 23 98 37.9 35.9 224 701 20 711 29.5
419 280 6.2 79 179 27.9 140 315 288 228 50 23 8.7 42.9 409 224 701 20 711 29.5
439 299 6.3 99 299 29.9 15.9 33.5 273 238 50 35 13.0 49.9 42.8 274 84.0 20 85.9 36.8
* Duetoourpolticyofcontinuousimprovement,allspecificationsaresubjecttochangewithoutnotice.
920-138-02 (3-04)
I _1, DANGER: Before installing or servicing system, always turn off main power to system. There may be more than one I(1) disconnect switch. Turn off auxiliary heater power if applicable. Electrical shock can cause personal injury or death.
I
II. INSTALLATION
Introduction
NOTE: Read the entire instruction manual before starting
the installation.
The OES/OHS series air conditioners and heat pumps are
ETL and c-ETL listed and are available inthe cooling/electric
heating sizes shown in Table 5 on page 13. This series of
units is designed for outside installation only.
The OES/OHS series air conditioners and heat pumps are
self-contained units. All components, including outdoor coil,
compressor, and refrigerant tubing, are located in a single
package. The units are already piped, charged, and wired.
Refer to Figure 2 on page 3 for basic unitdimensions.
The OES/OHS series air conditioners and heat pumps are
designed for installation invarious light commercial applications.
These instructions detail atypical method of installation. These
units can be installed with or without ductwork. Installed
flanges can be used for attaching ductwork or covered with a
decorative grille. OES/OHS series units come from the factory
with two 1"air filters installed. Simply bend tabs on filter rack
to accommodate 2" filters. Return filter grills are offered as
an accessory option. If a different or additional air filters are
required, they will need to be field-installed inthe duct system.
These units have 2" long duct flanges for connecting to the
field ducts.
Safety Considerations
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock, orother conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or dealer for information and assistance.
The qualified installer or agency must use factory-authorized
parts or accessories when modifying this product. Refer to the
individual instructions packaged with the parts or accessories
when installing.
Follow all safety codes. Wear the proper attire, including
safety glasses and work gloves. Read these instructions
thoroughly and follow allwarnings or cautions attached to the
unit. Consult local building codes, the National Electric Code
(NEC), and the Installation Standards, Warm Air Heating
and Air Conditioning Systems ANSI/NFPA 90B for special
installation requirements.
Recognize safety information. This is the safety-alert symbol:
_, When you see this symbol on the unit or in instructions
and manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words areused with the safety-alert symbol.
DANGER identifies the most serious hazards which will result
insevere personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is
used to identify unsafe practices which would result in minor
personal injury or product and property damage. NOTE isused
to convey special or supplemental information or to repeat and
emphasize information previously provided.
General Recommendations
(Do's and Do Not's)
The installation of this unit must comply with all local and
national electrical and installation codes. Where local
regulations differ with these instructions, local codes must
apply.
• Do read the instructions completely before installation.
• Do take time to perform a quality installation.
• Supply and return airductwork must be properly sized
for this equipment. All ductwork should be insulated to
prevent condensation and water damage.
• Do tape and seal all ductjoints.
• Do check the indoor conditioned air duct system static
pressure losses. Itshould not exceed those listedfor
these units. Consult your dealer or distributor for more
information.
When designing indoor supply systems, do not reduce
air intake or discharge sizes.
Do insulate all conditioned air duct system
components.
Do locate thermostat on an interior wall.
Do check that condensate drain line drains freely.
Do provide minimum installation and service
clearances.
• Do follow all guidelines for indoor and outdoor air
system.
• Do not drill into unit (except for 2 in. flanges for ducted
return units). This could cause a refrigerant leak.
• Do not substitute any components without checking
with your dealer or distributor, lfyou do substitute, get
approval in writing. Substitutions without approval void
unitwarranty.
• Do not guess. Consult your dealer ordistributor if any
portion of the installation procedure is unclear.
920-138-02 (3-04)
Installer Qualifications
This equipment isintended to be installed by a qualified HVAC
specialist who is experienced and thoroughly knowledgable
in air conditioning unit installation and operation, high voltage
electrical systems, ductwork construction and airflow, and
thermostat installation. All instructions for this unit as well
as separate equipment should be read completely before
attempting installation.
Inspection
Remove shipping protection and pallet from unit and inspect
for damage. Be sure to check for concealed internal shipping
damage. Do not install a damaged unit. Damage should be
reported to the last motor carrier to handle the shipment and a
request (written is preferred) should be made foran inspection
by the carriers agent.
Supplies Needed for Installation
The following items are required to install unit:
• Seven-conductor thermostat cable for OHS series, and
5-conductor thermostat cable for OES series. (20 gage
wire minimum).
• Supplies to connect indoor air (conditioned air supply)
duct to unit.
• Supplies to connect power to the unit.
• Supplies to connect low-voltage thermostat to unit.
Service Clearance and Unit Location
A minimum of 30 in.service clearance must be allowed infront
of the unit, and a minimum of 20 in. on either side. Additional
clearance may be necessary. Most serviceable components
are accessible from the front of the unit with the front panels
removed.
INDOOR AIR REQUIREMENTS
The indoor air system is designed to operate at specified
airflow rates and external static pressures. The supply and
return air duct system pressure losses (including filter, louver/
grille and registers) must not exceed the listed external static
pressures for the indoor air system.
_, CAUTION: Failure toadhere to indoor air requirements as
listed in the following section will void the unit warranty.
Indoor Air (Conditioned Supply Air)
System
The unit may beapplied ineither afree return airconfiguration
or a ducted returnairconfiguration. The design and construction
of the indoor-air system must provide adequate airdistribution
to ensure comfort levelsthroughout the structure. All ductwork
must be properly sized for the designed air flow of the unit. All
duct work should be properly insulated to conserve energy and
prevent condensation damage. Where the duct runs through
unheated spaces, it should be insulated with at least one inch
of insulation. Insulation with a vapor barrier on the outside
should be used. Use flexible joints to connect the ductwork to
the unit to reduce noise transmission into the structure. See
Figure 2 for additional information.
Table 1 - Indoor Air System Data
Model
OE$18K/ OHS18K
OES24K/ OH$24K
OES30K/ OHS30K
OES36KtOHS36K
OES42KtOHS42K
OES48K/OHS48K
OES60KtOHS60K
MotorSpeed
Low
High
Low
High
Low
High
Low
High
0.1
840
840
1280
1370
1280
1370
1690
1895
1690
1895
2350
E.S.R
0.2
750
750
1140
1220
1140
1220
1645
1795
1645
1795
2200
(Wet Coil)
0.3
65O
65O
965
1060
985
1060
1550
1690
1550
1690
2060
0.4
440
440
808
885
808
885
1450
1565
1450
1565
1900
0.5
250
250
615
665
615
665
1300
1340
1300
1340
1730
Recommended
Airflow Range
585-720
720-880
900-1100
1015-1240
1260-1540
1395-1720
1800-2200
NOTE: italic font indicates performance is outside the required operating window.
920-138-02(3-04)
_, CAUTION: Ifreturn air ducting is not used, an adequately
sized metal return air grille is required. Velocity should not
exceed 500 FPM for return air grilles, and 400 FPM for filter
grilles. It is recommended that the proper Friedrich return air
grille kit be installed in applications where no return duct is
used.
FILTERS
Two replaceable air filters are supplied from the factory. The
filters are accessible through the access panels on the sides of
the unit (See Figure2) or from the inside of the building through
the return airgrille.
The combined pressure losses of the return and supply air
paths must not exceed the external static capabilities of the
system at the design airflow (See Table 1).
The factory-installed filter rails are designed to hold 1" or 2"
filters. When using 2" filters the filter rail divider tabs must be
folded flat (See Figure 3).
NOTE: Dirty filters are the most common cause of inadequate
heating and cooling performance
• Inspect filters monthly
• Replace disposable type filters before they become
clogged
• Use water and mild detergent to clean washable type
filters
NOTE: Most filters are marked with an arrow to indicate the
proper direction of air flow through the filter The arrow MUST
point in the direction of air flow
OUTDOOR AIR SYSTEM
As a completely self-contained system, OES/OHS series units
require an adequate supply of outdoor air to exchange heat
from the outdoor air coil. The outdoor air intake and discharge
openings are located on the front and sides of the unit.
_IL CAUTION: To ensure proper operation, the outdoor air
intake and discharge air paths must be free and unobstructed
for the first 20 inches. The two air paths must be unrestricted
to ensure that the intake and discharge air do not recirculate
(also called short-circuit).
CONDENSATE DRAINAGE
A plastic drain hose extends from the drain pan to the vent at
the bottom of the unit. This line can be attached to a suitable
drainage system. If this is done, the system must be vented
or open type to ensure proper drainage. Condensate water
can freeze in cold weather which could create hazardous
situations.
Figure 3 - Filter Rail Adjustment
BEND TAB TO i, LLO_&' FOR 2" FLTER
920-138-02 (3-04)
MOUNTING PREPARATIONS
Forming the Duct Flanges
To minimize the possibility of shipping damage, all units are
shipped with field formed duct flanges. These flanges must
all be formed into place prior to mounting the unit.
The perforated bend lines of the duct flanges provide
a location for field hand bending/forming to occur in a
repeatable manner. When forming the flanges, begin at the
upper most perforations and work from top to bottom. The
procedures for bending the duct flanges are as follows:
• Face the back side ofthe unit,which is the side that will
ultimately make contact with the mounting surface. (See
Figure 4.)
• Wearing protective gloves, grasp the center of the
metal flange with both hands and gradually bend
outward at approximately a 45 degree angle.
• Continue this process until the entire length of the
flange is bent to a 45 degree angle.
• Starting back in the center, grasp the flange with both
hands and complete the bend to 90 degrees along the
entire length. The flange should now be perpendicular
to the rear of the cabinet. (See Figure 5.)
• Repeat the above steps for each of the eight
perforated metal flanges on the rear of the cabinet.
When completed, there will be eight duct flanges that
are perpendicular to the rear of the cabinet. (See
Figure 5.)
_, CAUTION: Repeated bending of the flanges from
flat to the perpendicular position will eventually weaken
the sheet metal and ultimately cause failure of the metal
flanges.
Installing Sealing Gaskets
In order to ensure a proper air seal between unit and the
building, the factory-supplied sealing gaskets must be
applied. Failure to install the gaskets may result in air leaks
and poor unit performance.
• Facing the mounting side of the unit, retrieve the
sealing gaskets from the return air opening of the
unit.
• Next, apply a piece of the gasket vertically to both
the left and right side of the air openings as shown.
• With the remaining gasket, seal the top and bottom
of both the supply and return air opening as shown.
Gaskets may be cut with a utility knife or torn by hand to
the proper length.
Figure 4
Duct Flanges as Shipped
Left Side
Duct Flanges as Shipped
Figure 5
Formed Duct Flanges with Gaskets Installed
Formed Duct Flanges
Left Side
920-138-02 (3-04)
MOUNTING THE UNIT
Mounting Information
Two holes must be cut inthe wall for the supply and return air
openings. (See Figures 7 and 8)
On wood frame walls, the wall may need to be reinforced in
order to hold up to the weight of the unit.
Concrete block walls must be thoroughly inspected to insure
that they can handle the unit weight.
It is the installer's responsibility to insure that hardware used
for mountng of unit is correct for wall material.
New Installation
OES/OHS units are affixed to the wall by way of three
mounting brackets. The bottom bracket supports the majority
of the weight load, and the side brackets hold the unit in place
(See Figures 6 and 7).
Friedrich recommends a 1 inch clearance to combustible
material for the first 3 feet of duct attached to the outlet air
frame.
1. Locate and mark lag bolt locations and bottom
mounting bracket location. (See Figure 8)
2. Mount bottom mounting bracket.
3. Connect the side mounting brackets to the rear
corner posts of the unit. Brackets may be mounted
with flanges outward or inward. See Figure 6
for dimensions for new installation. Friedrich
recommends installing the brackets outward.
4. Connect the rain flashing to the back flange of the
unit top by using screws in the top panel. Top rain
flashing is shipped secured to the back of the unit.
(See Figure 9)
5. Position the unit in the opening and secure to the
wall with 5/16 inch lag bolts; use 7/8 inch diameter
flat washers on the lag bolts.
6. Secure the rain flashing to the exterior wall and caulk
across the entire length of the top. (See Figure 9)
7. On side by side installations, maintain a minimum
of 20 inches clearance on both sides to allow
access to heat strips and to allow proper airflow
out of the outdoor coil. Additional clearance may
be required to meet local or national codes.
Replacement Installation
Friedrich mounting brackets are removable and can be
mounted in two ways to ensure the bracket holes are in line
with the studs. (See Figure 6)
When doing a replacement project measure the space
between the studs, then look at the chart below, which gives
the space between mounting brackets for all chassis sizes.
Decide in which position the brackets should be mounted
to best match the stud spacing. If the unit is to be installed
with the brackets facing outwards, (Figure 6) first mount the
brackets onto the unit and then secure to the wall. If the unit
is to be installed with the brackets facing inwards (Figure
6), first mount brackets to the wall, then position the unit up
against the wall and secure brackets to the unit.
Figure 6
Mounting Options
Flange Outward
Flange Inward
MODEL
OES/OHSl8&24
OES/OHS30&36
OES/OHS42,48&60
Flanges Outward
Mount flanges to chassis first
Flanges Inward
Mount flanges to watt first
Flange outward
36.9
41.9
43.9
MODEL
OES/OHS18&24
OES/OHS30&36
OES/OHS42,48&60
Flange inward
33.9
38.9
40.8
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