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WSHP-SVX022A-EN
Ignition Sources in Unit
This unit does not contain any ignition sources. All potential
ignition sources, (including factory or field installed
accessory electric heaters, gas heaters, relays, and
contactors) were evaluated during product UL listing.
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
min
) thresholds:
• 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
min
threshold. This product contains a leak
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
min
or TA
min
threshold,
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
Models
Amin (GG. 7DV)(m
2
)
0.6 meters height
Amin (GG. 7DV) (ft
2
)
1.94 feet height
GECK006 7 78
GECK009 7 78
GECK012 8 87
GECK015 9 95
GECK018 10 103
Minimum Room Area (A
min
) Adjustments
Use equation below to adjust the minimum room area, as
applicable, based on the unit’s installation height, altitude,
and occupancy level it serves.
A
min.adj
= Nameplate A
min
x Altitude Adj x Height Adj x F
occ
Multiply the altitude adjustment factor in the table below by
A
min
listed on the unit nameplate or in the Installation,
Operation, and Maintenance (IOM) manual.
Table 4. Altitude adjustment factor
Altitude (ft)
Sea Level
to 2000
2001 to
4000
4001 to
6000
6001 to
8000
8001 to
10000
10001 to
12000
12001 to
14000
14001 to
15000
Over 15000
A
min
Adjustment
1 1.05 1.11 1.17 1.24 1.32 1.41 1.51 1.57
In addition, A
min
can be adjusted if the unit is installed in a
room at a height that is higher than the minimum height
shown on the unit. To adjust A
min
, multiply by the ratio of
the unit minimum release height (in meters) / actual release
height (in meters). Use 0.6 m in the ratio for unit minimum
installation heights less than or equal to 0.6 m.
For institutional occupancies, ASHRAE Standard 15
applies an additional adjustment factor F
occ
to the amount
of a charge allowed in a space. To calculate the adjusted
A
min
for institutional occupancies, multiply the A
min
on the
nameplate by two.
EXAMPLE 1: 20 Ton Packaged Rooftop Multi-Zone VAV
System Serving an Institutional Occupancy Space
The packaged unit serves 7600 ft
2
of a nursing home
located at an attitude of 4000 ft. The unit has two equally
charged 10 ton refrigeration circuits. Each circuit has 12 lbs
of refrigerant with a minimum room area requirement of
180 ft
2
with a 2.2 m release height.
TA
min.adj
= 180 ft
2
x 1.05 x 2 = 378 ft
2
No additional ventilation is required.
EXAMPLE 2: 10 Ton Split System Serving a Single
Commercial Occupancy Space
The split system serves a 1500 ft
2
manufacturing space at
5000 ft altitude. The final installed charge of the single
circuit 10 ton unit is 20 lb. The unit has an open return with
a release height of 1 m and ducted supply air. The unit
A
min
is 660 ft
2
.
A2L Information
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