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Note: Use of an ethylene glycol-type antifreeze
reduces unit cooling capacity; this condition must
be accounted for during total system design. Also,
the low pressure control may need to be changed.
Contact the local Trane
For all 60 Hz units, heat tape is factory-installed on the unit
evaporator. Heat tape is optional on 50 Hz units. This heat
tape will protect the evaporator from freezing due to low
ambient temperatures down to -20
draw for 60 Hz units is 125 Watts on 20 through 30 Ton
units, and 250 Watts on 40 through 60 Ton units. For 50 Hz
units, heat tape power draw is 420 Watts on all units.
Internal/External Piping Heat Tape
(Field Provided)
Install an appropriately sized non-unit powered fused dis-
connect switch for the heat tape when applying it to all ex-
posed piping. Be sure to use heat tape that is recom-
mended for low-temperature applications. It should be ther-
mostatic controlled and dissipate 7 watts per linear foot. A
field installed thermostat must be installed if the heat tape
does not include a thermostat.
To install the heat tape properly, follow the instructions pro-
vided by the heat tape manufacturer. If no instructions are
provided, use the recommendations outlined below:
Figure 10
Typical Insulated, Spiralled Heat Tape Installation
representative.
®
o
F. Heat tape power
Installation
1. Wrap the heat tape around the pipe or apply it straight
along the pipe, as necessary, to provide the required pro-
tection. Refer to Tables 2A and 2B.
2. Use friction tape to secure the heat tape to the solution
pipe.
3. Place the thermostat parallel to the water pipe and tape it
tightly in place at both ends. Be sure to install the ther-
mostat on the most exposed (i.e., coldest) portion of the
pipe.
4. Wrap the pipe with an insulation material and cover it
with a weatherproof tape (if additional protection is re-
quired). On vertical pipe runs, start the wrap at the bot-
tom and work up as shown in Figure 10. Be sure to over-
lap the tape so that it will shed moisture.
Note: To prevent heat tape failure, frozen pipes,
and other unit damage, do not install insulation
under the weatherproof wrap if a non-thermostatic
controlled heat tape is used.
Table 2A
Non-Insulated, Non-Thermostatically controlled Heat
Tape with Outer Wrap
Application
Technique
"Straight"
2"
Heat Tape Req.
per Linear Ft.
12"
of Pipe
Protection
Down to (°F)
6°
"Spiralled"
Heat Tape Req.
per Linear Ft.
28"
of Pipe
Protection
Down to (°F)
-27°
Note: Spiralled applications are twisted around pipe
3 turns per linear foot of pipe.
Table 2B
Insulated, Non-Thermostatically controlled Heat Tape
with Outer Wrap
Application
Technique
"Straight":
2"
Heat Tape Req.
per Linear Ft.
12"
of Pipe
Protection
Down to (°F)
-6°
"Spiralled":
Heat Tape Req.
per Linear Ft.
26"
of Pipe
Protection
Down to (°F)
-55°
Note: Spiralled applications are twisted around pipe
3 turns per linear foot of pipe.
28
Pipe Size
2-1/2"
3"
4"
5"
12"
12"
12"
12"
11°
15°
20°
22°
31"
35"
47"
54"
-23°
-20°
-17°
-15°
Pipe Size
2-1/2"
3"
4"
5"
12"
12"
12"
12"
0°
3°
12°
16°
31"
35"
47"
54"
-50°
-45°
-40°
-1°
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