Sanyo ECO G SGP-EW120M2G2W, Technical Data Manual

Page: 62 / 115

System Design
7. Center-of-gravity and earthquake resistance
D-31
(1) Earthquake resistance calculations
Several earthquake-resistance ranks are used for carrying out earthquake-resistance calculations, as shown
in the following table. Gas heat pump air conditioners are considered to be common use equipment.
•
Equipment earthquake-resistance ranks
Earthquake-resistance ranks and their meanings are as follows
Maintenance of
operation
Horiz. design force
(Horizontal seismic
coefficient)
Strength
calculation
Earthquake-resistance
evaluation
Earthquake
resistant type
Can be operated after
inspection
1.5 G
Design target
value
Strength calculation or
verification test (Note 2), and
installation
earthquake-resistance
Common use
type
Can be operated after
small-scale repairs
(Note 1)
1.0 G As above
Installation
earthquake-resistance
evaluation (Note 3)
Equip
m
ent
Earth
qua
ke
Re
si
st
a
nc
e
Small
equipment
As above 0.6 G As above As above
Notes
1) Small-scale repairs are those that require up to two days to complete.
2) Mainframe strength (static), fasteners for each component (bolts, etc.)
3) Mounting bolt calculations, etc.
* The table is from “Earthquake-resistant equipment specification criteria for package air conditioners
and water chillers” published by the Japan Refrigeration and Air Conditioning Industry Association.
The above criteria are applicable to normal air conditioning equipment installed in buildings subject
to normal approval procedures under the Buildings Standard Law (e.g., less than 60m high)
(2) Verifying the strength of foundation bolts during an earthquake
●
Calculation formulae and table of allowable stresses
•
Design earthquake force
1) The design earthquake force consists of a horizontal force and a vertical force, acting simultaneously
on the equipment through the center of gravity.
2) The following formula gives the design earthquake force.
F
H
=K
H
・
W
F
H
: Design horizontal force (N) W : Equipment operating weight (N)
K
H
: Design horizontal quake magnitude F
V
: Design vertical force (N)
(Japanese scale)
Notes
1) “Earthquake resistant” refers to essential building services
2) “Common use type” refers to non-essential building services
3) Equipment with earthquake-resistant supports incorporates
stoppers to prevent amplification of shaking due to
resonance. In this case, shock-absorbent materials are
placed between the stoppers and equipment so that the
stoppers are not damaged or deformed by impact.
Equipment rank
Design horiz. Magnitude K
H
(Japanese scale)
Earthquake
resistant
1.5 G
Common use type 1.0 G
(Floor or pad mounting)
1
F
V
=
2
F
H