Unit Installation - Johnson Controls YHE Series Installation Manual

6152307-UIM-B-1022
CAUTION
!
This product must be installed in strict compliance with the enclosed
installation instructions and any applicable local, state, and national
codes including, but not limited to building, electrical, and mechanical
codes.
CAUTION
!
R-410A systems operate at higher pressures than R-22 systems. Do
not use R-22 service equipment or components on R-410A equip-
ment. Service equipment must be rated for R-410A.
Inspection
As soon as a unit is received, inspect it for possible damage during
transit. note the extent of the damage on the carrier's delivery receipt.
Make a separate request for inspection by the carrier's agent in writing.
Consult your local distributor for more information.
Requirements for installing/servicing R-410A equipment
• Gauge sets, hoses, refrigerant containers, and recovery system
must be designed to handle the POE type oils, and the higher
pressures of R-410A.
• Manifold sets should be high side and low side with low side
retard.
• All hoses must have a 700 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• Recovery equipment (including refrigerant recovery containers)
must be specifically designed to handle R-410A.
• Do not use an R-22 TXV.
Limitations
The unit should be installed in accordance with all National, State and
Local Safety Codes and the limitations listed below:
• Limitations for the indoor unit, coil, and appropriate accessories
must also be observed.
• 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 pres-
sure.
• The maximum and minimum conditions for operation must be
observed to ensure a system that will give maximum performance
and service life.
Table 1: Maximum/minimum operating limit conditions
Air temperature at
outdoor coil (°F)
Minimum Maximum
DB DB DB DB
cool heat cool heat
55° F -20 125 75
Operation below this temperature is permissible for a short period of time,
during morning warm-up.
• The unit should not be operated in cooling mode at outdoor tem-
peratures below 50°F without an approved low ambient operation
accessory kit installed.
• The maximum allowable line length for this product is 80 ft. To
install more than the maximum allowable line length, consult the
Piping Application Guide (P/N 247077).
2
Air temperature at
indoor coil (°F)
Minimum Maximum
WB DB WB DB
cool heat cool heat
57 50 72 80
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 and
Figure 2.
NOTICE
For multiple unit installations, units must be spaced a minimum of 24
in. (61 cm) apart (coil face to coil face).
If the unit is to be installed on a hot sun exposed roof or a paved ground
area that is seasonally hot, the unit should be raised sufficiently above
the roof or ground to avoid taking the accumulated layer of hot air into
the outdoor unit.
If the system is being installed during seasonally cold weather of 55°F
or below, the preferred method is to weigh in the charge. For charging
or checking the system charge at 55°F or below, see the Heating
charging charts in the System charge section. There is an optional Cold
Weather Charging accessory kit to prevent the outdoor unit from taking
in cold air below 55°F. The kit part number can be found in the list of
accessory kits on www.simplygettingthejobdone.com.
Provide adequate structural support for the unit.
Add-on replacement or 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 ensure
proper system operation and performance. Refrigeration piping change
out is also recommended.
1. Change-out of the indoor coil to an approved R-410A coil/condens-
ing unit combination with the appropriate metering device.
2. Change-out of the refrigeration piping when replacing an R-22 unit
with an R410-A unit is highly recommended to reduce cross-con-
tamination of oils and refrigerants.
3. If change-out of the refrigeration piping is not practical, then the fol-
lowing precautions should be taken.
• Inspect the refrigeration piping for kinks, sharp bends, or other
restrictions, and for corrosion.
• Determine if there are any low spots that might be serving as oil
traps.
• Flush the refrigeration piping 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 h 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 bi-
flow liquid-line drier. Operate the system for 10 h. Monitor the suc-
tion drier pressure drop. If the pressure drop exceeds 3 psig,
replace both the suction-line and liquid-line driers. After a total of 10
h 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 h of
run time.
Johnson Controls Ducted Systems