CAUTION
Compressor damage occurs if the system is
inadequately charged. On new system installations,
charge system according to the Tabular Data Sheet
for the matched coil and follow guidelines in this
instruction.
Refer to the Tabular Data Sheet provided in the customer
booklet for the unit for charge requirements. You must
permanently mark the total system charge on the unit
data plate.
CAUTION
Do not leave the system open to the atmosphere. Unit
damage could occur due to moisture being absorbed
by the POE oil in the system. This type of oil is highly
susceptible to moisture absorption.
Determining the total system charge
1. Determine the outdoor unit factory charge using
the Tabular Data Sheet (item 1).
2. Determine the indoor coil adjustment (if any) using
the Tabular Data Sheet (item 2).
3. Calculate the additional charge for the refrigerant
piping using the Tabular Data Sheet if the line
length is greater than 15 ft (4.6 m) (item 3).
4. Note that the total system charge = item 1 + item 2
+ item 3.
5. Check the unit against the pressure value listed on
the cooling chart on the unit or the appropriate
heat charging chart in this manual. Make any
adjustment necessary.
6. Add or subtract refrigerant to obtain the pressure
listed on the charging chart. Make sure to adjust
the total system charge by the amount added or
removed to obtain the charging chart pressures.
Permanently mark the unit data plate with the total
amount of refrigerant in the system.
WARNING
Do not attempt to pump Total System Charge
into outdoor unit for maintenance or service.
This may cause damage to the compressor or
other components. Recover and weigh System
Charge into an appropriate recovery cylinder
for any instances requiring evacuation.
CAUTION
It is unlawful to knowingly vent, release, or
discharge refrigerant into the open air during
repair, service, maintenance or the final
disposal of this unit.
Charging with gauges
About this task:
CAUTION
Refrigerant charging must only be carried out by a
qualified air conditioning contractor.
Note: All pressures/subcool valves shown are with
the compressor on high stage. System must be
charged with the compressor at full capacity.
All units include a cooling charging chart for the most
common indoor application in upflow orientation.
For all other cooling charging charts and the heating
charging charts, see Table to Table . You can also access
these charts in the Service Application Data section at
www.simplygettingthejobdone.com.
CAUTION
Compressor damage occurs if system is insufficiently
charged. On new system installations, charge system
according to the Tabular Data Sheet for the matched
coil and follow guidelines in this instruction.
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series14
Johnson Controls Ducted Systems
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