Unit Installation; Location; Add-On Replacement/Retrofit - Johnson Controls RHP143 Series Installation Manual

Note:
• 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 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.
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
6 R-410A Outdoor Split-System Heat Pump Installation Manual - YH2E / THE2 / RHP143 Series
NOTICE
Heating charging charts.
Johnson Controls Ducted Systems
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 proper
system operation and performance. Change out the line
set 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 line-set 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 line set is not practical, then
the following precautions 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 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 factory
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.