Charging The System - Bosch CE SPLIT series Installation And Maintenance Manual

14
CE Split Series
The air handler is factory supplied with a
holding charge of dry nitrogen.
Connect and braze lines to service valves on the
condensing section (See figure #11 – Service Valve
Drawing).
Always wrap the body of the service valve with
a wet towel or apply some other form of heat
sink prior to brazing and direct flame away
from the valve body. Failure to do so will result
in damage to the valve. Valve body
temperature must remain below 250°F to
protect the internal rubber "O" rings and seals.
valve
stop
figure #11
unit Size line
Type
ce025/035/049 suction
ce061/071 suction
all valves liquid
Pressurize the refrigerant line set and air handler to
150 lbs with dry nitrogen through the Schrader ports
provided on the service valves. Check line set and
unit connections for leaks.
Once system integrity is verified, evacuate line set
and air handler with a good vacuum pump to 500
microns and hold for one half hour.
Pump-down must never be used with heat
pumps.

CHarGInG THE SYSTEM

Do not overcharge the system. Charge all systems by
weight as determined from Table 3 and the supplied
factory charge. Remember the condensing unit is
6 720 220 049
Caution
schRaedeR
poRt
Valve allen
Conn. wrench
Size size
3/4 5/16
7/8 5/16
3/8 3/16
Subject to change without prior notice
Charging the System
factory charged with sufficient refrigerant to support
the air handler, condensing section and 25 feet of
liquid line. If the lines are less or more than 25 feet,
then a charge adjustment must be calculated. Refer
to examples #1 and #2 following Table 4.
High pressure refrigerant gas and liquid is
present in the unit. Liquid refrigerant can
cause severe burns to exposed skin areas.
Wear safety glasses to protect the eyes. Liquid
refrigerant in contact with the eyes could
cause loss of sight.
Open both service valves in the condensing section
by turning the valve stops located at the top of each
valve counter-clockwise with an Allen wrench (See
Figure 11). Make sure that both valves are fully open.
THInGS To rEMEMbEr
1) Do not oversize liquid lines unless absolutely
unavoidable. If oversized lines must be used, a
suction line accumulator may be required and
the addition of a crankcase heater may be
necessary. Consult the Factory for
recommendation.
2) If the calculated Equivalent Line Length falls
between the lengths shown on Table 3, use
tubing sized for the next longer length.
3) Maximum Linear (actual) liquid line length
without a suction line accumulator is 60 feet.
Liquid line length in excess of 100 feet is not
recommended either with or without a suction
line accumulator.
4) A liquid line drier-filter is required, it must be of
the bidirectional type only and approved for the
refrigerant type utilized.
5) Suction line size must be one of those given in
Table 3.
6) Horizontal suction line runs should be pitched
slightly toward the compressor to provide free
drainage and aid oil return. Do not exceed the
largest diameter given in the tables on horizontal
runs.
7) When brazing always bleed dry nitrogen through
refrigerant tubing to displace air and prevent
oxidation.
8) Air handler is pre-charged in the factory with
nitrogen gas. Cut air handler piping with care.
Revised 03-11