Refrigerant Charge Determination; Rtud Chilled Water Flow Control; Oil Charge Determination; Outdoor Air Temperature Sensor Installation Requirements - Trane RTWD Installation Operation & Maintenance

Split system installation

Refrigerant Charge Determination

The approximate amount of the refrigerant charge
required by the system must be determined by referring
to Table 11 and must be verifi ed by running the system
and checking the liquid line sightglasses.
Note: The maximum charge can reduce the maximum
length of the piping. Due to maximum allowable
refrigerant charge not all units can have 61 m of piping.
To determine the approximate charge, fi rst refer to
Table 11 and establish the required charge without
the fi eld-installed piping. Then refer to Table 12, to
determine the charge required for the fi eld-installed
piping. The approximate charge is therefore the sum of
the values from Table 11 and Table 12.
Table 11 - System Refrigerant Charge
Max Unit Charge
Ton Circuit 1
(Kg)
60 144
70 140
80 140
90 160
100 160
110 157
120 156
130 180
140 177
160 173
170 177
180 170
190 177
200 191
220 189
250 185
Table 12 - Field-Installed Piping Charge
Discharge
Pipe O.D.
Line (kg)
1 1/8
1 3/8
1 5/8
2 1/8
2 5/8
3 1/8
4 1/8
Note: The amounts of refrigerant listed in Table 12 are
based on 30 m of pipe. Actual requirements will be in
direct proportion to the actual length of the piping.
Note: Table 12 assumes: Liquid Temperature = 41°C;
Saturated Discharge Temperature = 52°C; Discharge
Superheat = 16.7°C.
34
Max Unit Charge
Circuit 2
(Kg)
144
140
140
160
160
157
156
180
177
173
177
170
177
191
189
185
Liquid
Line (kg)
- 18.6
- 28.1
- 40.0
3.6 69.9
5.9 -
8.2 -
14.5 -
NOTICE
REFRIGERANT CHARGING!
Equipment Damage
Add initial fi eld refrigerant charge only through the
service valve on the liquid line, not the service valves on
the evaporator, and insure that water is fl owing through
the evaporator during the charging process. Failure to do
the above could result in equipment damage.

RTUD Chilled Water Flow Control

CAUTION
Equipment Damage
ALL RTUD unit chilled water pumps MUST be controlled
by the Trane CH530 to avoid catastrophic damage to the
evaporator due to freezing.

Oil Charge Determination

The RTUD unit is factory charged with the amount of oil
required by the system. No additional oil is required for
fi eld installed piping.
Outdoor Air Temperature Sensor
Installation Requirements
The outdoor air temperature sensor is optional for
the RTWD water cooled units, but is a required sensor
for the RTUD compressor chiller units. The sensor is
required as an important input to the condenser fan
control algorithm as well as for the low outdoor air
ambient lockout feature. The temperature sensor probe
is shipped separately inside the control panel.
It is necessary for the chiller installer to locate and install
the separate outdoor air sensor probe at the remote
air cooled condenser at a location to sense the coil's
entering air temperature, while avoiding direct sunlight.
It should be located at least 5.1 cm from the coil face and
somewhere "in-between" the two refrigerant circuits.
Where the condenser installation is such that the two
refrigerant circuit's condensers are physically separate
from each other, or one circuit is more likely to see
re-circulated warmer air, an attempt should be made
to locate the probe to see an average temperature of
the two separate condensers. Note: it is important that
the probe provided not be substituted with another
probe, as the probe and the electronics are "matched /
calibrated" at the factory for accuracy.
A twisted pair sheathed cable shall be run and
connected between the probe at the remote condenser
and its LLID module in the chiller control panel. The
sensor's circuit is a class II power limited analog circuit
and therefore the wire should not be run in close
proximity to any power or line voltage wiring. The
splices at the condenser end, should be made to be
water tight. The wire run should be physically supported
at equal intervals with consideration for safety and
reliability/durability with wire ties or similar to meet
local codes.
RLC-SVX14H-GB