Unit Installation; Typical Installation With Required Clearances - York International CMB SERIES Installation Manual

163911-UIM-A-0106
LIMITATIONS
The unit should be installed in accordance with all National, State and
Local Safety Codes and the limitations listed below:
1. Limitations for the indoor unit, coil and appropriate accessories
must also be observed.
2. The outdoor unit must not be installed with any duct work in the air
stream. The outdoor fan is the propeller type and is not designed
to operate against any additional external static pressure.
3. The maximum and minimum conditions for operation must be
observed to assure a system that will give maximum performance
with minimum service.
4. The unit should not be operated at outdoor temperatures below
55° F without an approved low ambient operation accessory kit
installed.
5. The maximum allowable line length for this product is 75 feet.
SECTION III: UNIT INSTALLATION
LOCATION
Before starting the installation, select and check the suitability of the
location for both the indoor and outdoor unit. Observe all limitations and
clearance requirements.
The outdoor unit must have sufficient clearance for air entrance to the
condenser coil, for air discharge and for service access. See Figure 1.
TO INDOOR
BLOWER
NOTE: ALL OUTDOOR WIRING MUST BE WEATHERPROOF
FIGURE 1: Typical Installation with Required Clearances
GROUND INSTALLATION
The unit may be installed at ground level on a solid base that will not
shift or settle, causing strain on the refrigerant lines and possible leaks.
Maintain the clearances shown in Figure 1 and install the unit in a level
position.
Normal operating sound levels may be objectionable if the unit is placed
directly under windows of certain rooms (bedrooms, study, etc.).
Isolate the unit from rain gutters to avoid any possible wash out of the
foundation.
ROOF INSTALLATION
When installing units on a roof, the structure must be capable of sup-
porting the total weight of the unit, including a pad, lintels, rails, etc.,
which should be used to minimize the transmission of sound or vibra-
tion into the conditioned space.
2
THERMOSTAT
NEC CLASS 2
WIRING
TO COIL
SEAL OPENINGS WITH
PERMAGUM OR EQUIVALENT
18" FRONT
& SIDES
NOTE: For multiple unit installations, units must be spaced a minimum
of 18 inches apart. (coil face to coil face.)
If the unit is to be installed on a hot sun exposed roof or a black-topped
ground area, the unit should be raised sufficiently above the roof or
ground to avoid taking the accumulated layer of hot air into the outdoor
unit.
Provide an adequate structural support.
ADD-ON REPLACEMENT/RETROFIT
The following steps should be performed in order to insure proper sys-
tem operation and performance.
1. Change-out the indoor coil , if required to an approved R-22 coil/
condensing unit combination with the appropriate metering device.
2. If the outdoor unit is being replaced due to a compressor burnout,
then installation of a 100% activated alumina suction-line filter
drier in the suction-line is required, in addition to the factory
installed liquid-line drier. Operate the system for 10 hours. Monitor
the suction drier pressure drop. If the pressure drop exceeds 3
psig, replace both the suction-line and liquid-line driers. After a
total of 10 hours run time where the suction-line pressure drop has
not exceeded 3 psig, replace the liquid line drier, and remove the
suction-line drier. Never leave a suction-line drier in the system
longer than 50 hours of run time.
NEC CLASS 1
WIRING
WEATHERPROOF
DISCONNECT SWITCH
48" OVERHEAD
CLEARANCE
UNIT PLACEMENT
1. Provide a base in the pre-determined location.
2. Remove the shipping carton and inspect for possible damage.
3. Compressor tie-down bolts should remain tightened.
4. Position the unit on the base provided.
LIQUID LINE FILTER-DRIER
The air conditioning unit's copper spun bi-flow filter/dryer is located on
the liquid line.
NOTE: Replacements for the liquid line drier must be exactly the same
as marked on the original factory drier. See Source 1 for O.E.M.
replacement driers.
24" SERVICE
ACCESS
CLEARANCE
Unitary Products Group