Friedrich OES Series, Installation & Operation Manual

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920-138-02 (3-04) 920-138-02 (3-04)
Table 1 – Indoor Air System Data
Installer Qualifications
This equipment is intended 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 for an 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 in front
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 to adhere to indoor air requirements as
listed in the following section will void the unit warranty.
Indoor Air (Conditioned Supply Air)
System
The unit may be applied in either a free return air configuration
or a ducted return air configuration. The design and construction
of the indoor-air system must provide adequate air distribution
to ensure comfort levels throughout 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.
Model Motor Speed
Rated
SCFM
E.S.P. (Wet Coil)
Recommended
Airflow Range
0.1 0.2 0.3 0.4 0.5
OES18K / OHS18K
–
650
840 750 650 440 250 585-720
OES24K / OHS24K
–
800
840 750 650 440 250 720-880
OES30K / OHS30K
Low 1280 1140 985 800 615
900-1100
High
1000
1370 1220 1060
885
665
OES36K / OHS36K
Low 1280 1140 985 800 615
1015-1240
High
1150
1370 1220 1060 885 665
OES42K / OHS42K
Low 1690 1645 1550 1450 1300
1260-1540
High
1400
1895 1795 1690 1565 1340
OES48K / OHS48K
Low 1690 1645 1550 1450 1300
1395-1720
High
1550
1895 1795 1690 1565 1340
OES60K / OHS60K
–
1900
2350 2200 2060 1900 1730 1800-2200
NOTE: Italic font indicates performance is outside the required operating window.