Minimum Room Area Limits; Per Circuit) - Trane IntelliPak 3 with Symbio 800 Installation, Operation And Maintenance Manual

A2L Information

Minimum Room Area Limits

(Refrigerant charge greater than 3.91 lb

per circuit)

Equipment with R–454B charge amounts greater than 3.91
lb per circuit may require additional circulation or ventilation
airflow mitigation strategies. In this case, two minimum
room area (A ) thresholds:
min
• The first threshold defines when equipment serving a
single room is required to provide circulation airflow,
either continuous or activated by a leak detection
system. A ducted system requires circulation airflow
unless the smallest room it serves is larger than the
adjusted A threshold. This product contains a leak
min
detection system if a circuit charge is greater than 3.91
lbs. As a result, no further leak detection system
evaluation is required.
• The second threshold defines when additional
ventilation airflow is required. If the room area, A or TA,
is below the adjusted A
additional ventilation is required to remove refrigerant in
the event of a leak. Refer to UL 60335-2-40 Clause
GG.8 and ANSI\ASHRAE Standard 15 Section 7 for
natural and mechanical ventilation requirements.
Table 3. Minimum room area
Tonnage
Eff
20 V
25 H
25 V
30 S
30 H
30 V
40 S
40 H
40 V
50 S
50 H
50 V
55 S
55 H
55 V
60 S
60 H
60 V
70 S
70 H
70 V
30
or TA threshold,
min min
Minimum Room Area (a)
m 2 ft 2
49 528
52 558
67 723
53 570
68 735
63 682
67 723
87 941
89 963
79 855
114 1229
103 1106
86 922
118 1274
102 1094
93 1001
119 1282
118 1271
112 1207
144 1552
149 1600
Table 3. Minimum room area (continued)
Tonnage
Eff
75 S
75 H
75 V
(a) Based 2.2M installation height and maximum refrigerant charge
Modulating Hot Gas Reheat for
Dehumidification
Modulating hot gas reheat involves adding a refrigerant-to-
air heat exchanger downstream of the evaporator (cooling)
coil. A valve diverts the hot refrigerant vapor leaving the
compressor through this heat exchanger to reheat the
dehumidified air leaving the evaporator coil. This allows the
use of heat that is recovered from the refrigeration circuit of
the rooftop unit to reduce system operating costs by
avoiding the use of "new" energy for reheat.
The main function of the IntelliPak® rooftop unit is to
provide zone temperature control. While modulating hot
gas reheat will improve dehumidification performance at
part-load conditions, it does not function as a standalone
dehumidifier. In general, hot gas reheat requires a call for
cooling to initiate. If there is a need for dehumidification
when there is no need for sensible cooling, another
solution may need to be investigated. IntelliPak packaged
rooftop systems include non-standard solutions that might
be considered for these applications.
Applications which should be investigated before using the
standard modulating hot gas reheat option include:
• Process humidity control applications
• Makeup air or 100% outdoor air
• Zones with dramatically varying load conditions
(sanctuaries, locker rooms, gymnasiums, etc.)
Modulating Hot Gas Reheat for
Dehumidification
Modulating hot gas reheat involves adding a refrigerant-to-
air heat exchanger downstream of the evaporator (cooling)
coil. A valve diverts the hot refrigerant vapor leaving the
compressor through this heat exchanger to reheat the
dehumidified air leaving the evaporator coil. This allows the
use of heat that is recovered from the refrigeration circuit of
the rooftop unit to reduce system operating costs by
avoiding the use of "new" energy for reheat.
The main function of the IntelliPak® rooftop unit is to
provide zone temperature control. While modulating hot
gas reheat will improve dehumidification performance at
part-load conditions, it does not function as a standalone
dehumidifier. In general, hot gas reheat requires a call for
cooling to initiate. If there is a need for dehumidification
when there is no need for sensible cooling, another
solution may need to be investigated. IntelliPak packaged
Minimum Room Area (a)
m 2 ft 2
121 1301
146 1570
148 1597
RT-SVX080A-EN