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Module RCM-I
RCM-I Installation
Outdoor Unit Installation
Locate the outdoor unit in a suitable location, as close as
possible to the fan coil. Maintain the clearances recommended
in the HVS Variable Speed Heat Pump manual to ensure proper
airflow. The outdoor unit must be installed level, in a properly
supported location. If proper refrigerant piping techniques are
used, a liquid line bi-directional filter/drier is not needed. More
information can be found in module HVS - Variable Speed Heat
Pump Manual.
Evacuating
The system must be brazed under a nitrogen purge to
prevent oxidation of the pipe during the brazing process. After
the piping is installed and all components have been brazed
together, a vacuum pump must be used to properly evacuate
the system from both of the access ports to 1500 microns, to
ensure system is free of contaminants. Add refrigerant to the
system to bring the pressure above zero psig. After allowing
the refrigerant to absorb moisture, repeat the above procedure.
Evacuate the system to 500 microns on the second evacuation,
and ensure that the system holds at the vacuum pressure. If not,
check for leaks and evacuate again. If the vacuum holds, add
refrigerant to raise the pressure to 2 psig. At this point open
service valves on pre-charged condensing units.
The use of an electronic leak detector is recommended, as it is
more sensitive to small leaks under the low pressures.
Once the system has been determined clean and ready for
charging, refrigerant can be added. The service valves on the
condenser must be open at this time. By referring to page 5 in
the HVS Heat Pump Manual, if additional refrigerant is needed,
weigh in the recommended amount. Truly, the only way to tell
if the system is properly charged is by pulling out all refrigerant,
then weighing it back in based on the factory charge listed on
the rating plate, plus any additional refrigerant needed based
on page 5 of Module HVS - Variable Speed Heat Pump Manual.
Charging
Wiring – Outdoor Unit
Make all connections to the outdoor unit with rain tight
conduit and fittings. Most building codes require a rain tight
disconnect switch at the outdoor unit as well (always check
local codes). Run the proper size copper wires to the unit, and
connect as per the manufacturer’s recommendations.
The RCM-I coil can operate at a level that is different from most
other conventional system coils. This coil is supplied refrigerant
by a variable speed condenser/compressor, so refrigerant
pressures and temperature can vary as well. Temperature
and pressure reading aren’t as important for a refrigeration
technician to know in a variable speed heat pump condensing
unit.
Important:
Failure to follow the proper
evacuating and charging procedures may
void warranty.
Carry-over Screen
All RCM-I refrigerant cooling modules come supplied with
a nylon mesh carry-over screen and six stand-off plugs. The
Hi-Velocity units have a very high humidity removal rate, it is
possible for the airflow across the coil to grab moisture off the
fins and carry it into the unit. With the carry-over screen in place
it reduces the chance of moisture being carried into the unit.
Ensure that the nylon mesh is placed on the exiting air side of
the cooling module (Fig. 4)
Installation Instructions
The Carry Over Screen is placed on fan coil side of the cooling
module (Fig. 04).
Fig. 04 - Screen on the fan coil side
On the fan coil side of the cooling module, attach three plastic
stand-offs down each side of the cooling coil (Fig. 05).
Fig. 05 - Attach stand-off plugs
Place the nylon wire mesh over the stand-offs, ensuring the
screen touches the drain pan. Then snap the screen over the
plastic stand-offs (Fig. 06).
Fig. 06 - Attach screen to coil
Module RCM-I - RCM-I Coil Installation (4/8)
