P-Trap
Secondary drain pan
© 1995-2009 Energy Saving Products Ltd.
Some building codes call for the use of a secondary drain
pan underneath the entire unit
(Fig. 03)
. Any installation that
has the potential of property damage due to condensate must
have a secondary drain pan installed. If the unit is installed
in a high heat and/or high humidity location, extra insulation
around the unit casing may be required. This will prevent
excessive condensate from forming on the outer surface of
the casing.
Fig. 03 - Secondary drain pan
All RPM-E modules come with a ¾”
(19mm)
primary and
secondary outlet. The condensate drain must have a vented
p-trap installed
(Fig. 03)
, and run at a slope of ¼”
(6.7mm)
per
foot in the direction of the drain. When installing the P-trap, one
must be installed on both the primary and secondary outlets.
The P-traps must have a minimum depth of two inches
(51mm)
.
Due to the high negative pressure of the blower system, the
RPM-E will hold some amount of water during operation.
Once this level has been achieved, condensate will flow from
the coil regularly. When the unit shuts down, or lowers speed,
the force is released, allowing the held condensate to empty
from the drain pan. During this time, condensate may flow
from both the primary AND secondary drains.
Drain Connections
Secondary Drain Pan
Module RPM
Refrigerant Module Installation (RPM-E) (2/4)
Module RPM Refrigerant Module Installation (RPM-E) (2/4)
Pipe Sizing
When sizing refrigerant piping,
follow the outdoor unit
manufacturer’s recommendations.
Run the pipes in the most direct route possible, taking
into account structural integrity and building details. If the
evaporator is located above the condenser, slope any
horizontal runs toward the condenser. If the condenser is
located above the evaporator, a P-trap must be installed at the
bottom of the vertical riser. For long vertical risers, additional
P-traps must be installed for every twenty feet
(6m)
. For lines
running over 50’
(15m)
, a suction line accumulator must be
installed. Lines running over 100’
(30m)
are not recommended.
All lines should be piped so as not to restrict access to the
front panels, filter section, or electrical enclosure.
Piping the RPM-E
Only refrigerant grade pipe and fittings are to be used
with Hi-Velocity Systems. Plumbing fittings may contain wax
or other contaminants which are detrimental to the proper
operation of the system. Insulate the suction line with 3/8”
(9.53mm)
insulation such as Armaflex. In high heat areas, 1/2”
(12.7mm)
insulation may be needed. If the lines are run in an
area where temperatures could exceed 120°F
(49°C)
or runs
longer than 50’
(15.24m)
, then the liquid line may need to be
insulated as well. Support the pipe every 5 feet
(1.52m)
, or
whatever local code states.
Locate the outdoor unit in a suitable location, as close as
possible to the fan coil. Maintain the clearances recommended
by the manufacturers of the outdoor unit, to ensure proper
airflow. The outdoor unit must be installed level, in a properly
supported location. A liquid line filter/drier is recommended to
be installed.
Outdoor Unit Installation
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.
Ensure that the outdoor unit is setup for a TX system. If not,
a hard start kit may be required.
Wiring - Outdoor Unit
Brazing & Pressure Testing
The RPM-E comes pre-piped with the coil assembly.
With the RPM-E, the Liquid and Suction lines are the only
brazing that need to be done at the fan coil. For charging and
brazing, remove the front access panel of the RPM-E (
Fig.
04
). With the access panel removed, the coil assembly will
be accessible. Wet rag the liquid and suction line (or use a
heat dissipating paste) to ensure no overheating occurs to
the pre-piped coil assembly. Excess heat may damage the
RPM-E components.
Fig. 04 - Remove Front Access Panel
Once the system has been brazed it must been pressure
tested. Pressure testing must be done with nitrogen and not
refrigerant. Typically, pressures are tested to the maximum
operating pressure that the system will see. Allow the system
to hold the nitrogen charge for at least 15 minutes to ensure
there are no leaks. Check with local codes for proper testing
procedures.