Johnson Controls R-410A Section Iii Unit Installation, UIM-A-0112, Limitations, Location

835964-UIM-A-0112

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 ensure a system that will give maximum performance with minimum service.

TABLE 1: Application Limitations

Ambient Air Temperature		Air Temperature on
on Outdoor Coil		Indoor Coil
Min. DB	Max. DB	Min. WB	Max. WB
50°F	115°F	57°F	72°F

4.The unit should not be operated at outdoor temperatures below 50°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, air discharge, and service access. See Figure 1.

NOTICE

For multiple unit installations, units must be spaced a minimum of 18” (46 cm) 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

When this unit is being used as a replacement for an R-410A unit, it is required that the outdoor unit, indoor coil, and metering device all be replaced. The following steps should be performed in order to insure proper system operation and performance. Line-set change out is also recommended.

1.Change-out of the indoor coil to an approved R-410A coil/ con- densing unit combination with the appropriate metering device.

2.Change-out of the line-set when replacing an R-22 unit with an R410-A unit is highly recommended to reduce cross-contamina- tion of oils and refrigerants.

3.If change-out of the line set is not practical, then the following pre- cautions should be taken.

•Inspect the line set for kinks, sharp bends, or other restrictions, and for corrosion.

•Determine if there are any low spots which might be serving as oil traps.

•Flush the line set with a commercially available flush kit to remove as much of the existing oil and contaminants as possible.

•Install a suction line filter-drier to trap any remaining contami- nants, and remove after 50 hours of operation.

4.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.

	MINIMUM 18” SERVICE
60” OVERHEAD	ACCESS CLEARANCE	THERMOSTAT
	ON ONE SIDE
CLEARANCE
	WEATHERPROOF
	DISCONNECT
	SWITCH
		NEC CLASS 1 WIRING
6” CLEARANCE		TO FURNACE OR
AROUND PERIMETER		AIR HANDLER
		TERMINAL BLOCK
		NEC CLASS 2 WIRING
		TO INDOOR COIL
NOTE:
ALL OUTDOOR WIRING	CONTROL
MUST BE WEATHERPROOF.
	ACCESS	SEAL OPENING(S) WITH
	PANEL	PERMAGUM OR EQUIVALENT

FIGURE 1: Typical Installation

2 Johnson Controls Unitary Products