Note:
• Operation below this temperature is permissible
for a short period of time, during morning
warm-up.
• The unit must not be operated in cooling mode
at outdoor temperatures below 50°F without an
approved low ambient operation accessory kit
installed.
• The maximum allowable line length for this
product is 80 ft. Consult the Piping Application
Guide (P/N 247077) for installations over the
maximum allowable line length. Installation
of an accessory crankcase heater is required if
not factory-installed for installations over the
maximum allowable line length.
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 outdoor 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 installed on a hot sun-exposed roof or a
paved ground area that is seasonally hot, the unit must
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 . 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 at
www.simplygettingthejobdone.com.
Provide adequate structural support for the unit.
Add-on replacement/retrofit
About this task:
When using this unit as a replacement for an R-410A
unit, you must replace the outdoor unit, indoor coil,
and metering device. Do the following to ensure correct
system operation and performance. Change out the
refrigeration piping where possible.
1. Change out the indoor coil to an approved
R-410A coil or outdoor unit combination with the
appropriate metering device.
2. Change out the refrigeration piping when replacing
an R-22 unit with an R410-A unit to reduce cross-
contamination of oils and refrigerants.
3. If a change-out of the refrigeration piping is not
practical, then take the following precautions:
- Inspect the refrigeration piping 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 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 contaminants, 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 field-
installed biflow liquid-line drier. Operate the
system for 10 h. 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 h runtime 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.
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series6
Johnson Controls Ducted Systems
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