Trane IntelliPak 3 with Symbio 800 Installation, Operation And Maintenance Manual page 37

heating mode as follows. (Keep in mind when determining
LOADS that the compressors and condenser fan motors
don't run while the unit is in heating mode).
For units using heaters less than 50 kW:
MCA = 1.25 x (LOAD1 + LOAD2 + LOAD4) + (1.25 x
LOAD3)
For units using heaters equal to or greater than 50 kW:
MCA = 1.25 x (LOAD1 + LOAD2 + LOAD4) + (1.0 x
LOAD3)
The nameplate MCA value will be the larger of the cooling
mode MCA value or the heating mode MCA value
calculated above.
MOP = (2.25 x LOAD1) + LOAD2 + LOAD3 + LOAD4
The selection MOP value will be the larger of the cooling
mode MOP value or the heating mode MOP value
calculated above.
Select a fuse rating equal to the MOP value. If the MOP
value does not equal a standard fuse size as listed in NEC
240-6, select the next lower standard fuse rating. If the
selected MOP value is less than 125 percent of the current
rating of the electric heat load, select the next higher
standard fuse rating.
Note: If selected MOP is less than the MCA, then select the
lowest standard maximum fuse size which is equal
to or larger than the MCA, provided the selected
fuse size does not exceed 800 amps.
Service Sizing Data
Table 5. Compressor electrical service sizing data (20 to 75 tons)
No. of
Tons
Compressors
RLA (ea.)
1 (a)
20V
1
1
25H
2
1 (a)
25V
1
1
30S
2
1
30H
2
1 (a)
30V
1
2
40S
2
2
40H
2
1 (a)
40V
2
1
50S
3
RT-SVX080A-EN
200 V
LRA (ea.) RLA (ea.)
48.4 NA 42.1
40.3 267 40.3
27.8 203 27.8
40.3 267 40.3
56.7 NA 49.3
44 304 42.3
27.8 203 27.8
40.3 267 40.3
27.8 203 27.8
44 304 42.3
63.5 NA 55.2
50.7 315 46.4
34.4 267 31.5
40.3 267 40.3
34.4 267 31.5
40.3 267 40.3
63.5 NA 55.6
40.3 267 40.3
40.3 267 40.3
44 304 42.3
Dual Source Power units (200–230V with Electric Heat)
These units will have two circuit values shown on the
nameplate. The first circuit value will be the refrigeration
(cooling mode) values calculated per Set 1. The second set
of circuit values shown on the nameplate will be for the
electric heating circuit as follows.
For units using heaters less than 50 kW:
MCA = (1.25 x LOAD3)
For units using heaters equal to or greater than 50 kW:
MCA = (1.0 x LOAD3)
MOP = (1.25 x LOAD3)
Select a fuse rating for the electric heating circuit that is
equal to the MOP value obtained in the equation above. If
the MOP value does not equal a standard fuse size as
listed in NEC 240-6, select the next lower standard fuse
rating (see note below for exception). If the selected MOP
value is less than 125 percent of the current rating of the
electric heat load, select the next higher standard fuse
rating.
Note: If the available MOP option is less than the MCA
obtained in the equation above, then reselect the
lowest standard maximum fuse size which is equal
to, or larger, than the MCA, provided the reselected
fuse size does not exceed 800 amps.
230 V 460 V
LRA (ea.) RLA (ea.)
NA 21.1
267 19.2
203 14.6
267 19.2
NA 24.7
304 21.8
203 14.6
267 19.2
203 14.6
304 21.8
NA 27.6
315 23.2
267 17.9
267 19.2
267 17.9
267 19.2
NA 27.9
267 19.2
267 19.2
304 21.8
Installation
575 V
LRA (ea.) RLA (ea.)
NA 16.9
142 15.9
98 12.6
142 15.9
NA 19.7
147 17.2
98 12.6
142 15.9
98 12.6
147 17.2
NA 22.1
158 19.2
142 15.2
142 15.9
142 15.2
142 15.9
NA 22.3
142 15.9
142 15.9
147 17.2
LRA (ea.)
NA
103
84
103
NA
122
84
103
84
122
NA
136
103
103
103
103
NA
103
103
122
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