Toshiba RBM-A101UPVA-E, Manual

Page: 22 / 58

7. AHU / DX COIL Design
7.1 Equipment selection procedure -Selection flow chart-
 Determination of air-conditioning load at each room.
YES
 Corrected capacity B of
AHU/FAHU >= air-conditioning
load (for All rooms)
 Preliminary selection of AHU/FAHUs in the standard capacity no
less than air-conditioning load at each room.
 Calculate corrected capacity A of each AHU/FAHU by correcting of
indoor temperature for the standard capacity of
each AHU/FAHU. (Refer to Chart [1])
 Preliminary selection of outdoor unit in the standard capacity no less
than total valuese of corrected capacity
A
in AHU/FAHU. At same time,
check both connectable AHU/FAHUs number and the outdoor
diversity(Connected ratio of AHU/FAHU to outdoor units) for the
specificaitons.
 Calculate corrected capacity B of each AHU/FAHU by following 2
Steps.
Step 1: Find the correction value of "Connecting pipe length and lift"
by both the longest length and the largest height with selected piping
condition at

or

'. (Refer to Databook of Outdoor unit)
 Find correction values of below items for the standard capacity of
outdoor unit selected at

or

' .
Then determination of total corrected capacity of the selected outdoor
unit by all multiplying.
- Correction of indoor temperature condition (Refer to Chart [1])
- Correction of outdoor temperature condition (Refer to Databook of
Outdoor unit)
- Correction of connecting pipe length and lift between AHU/FAHU
and Outdoor units by both the longest length and the largest height
(Refer to Databook of Outdoor unit)
- Correction of outdoor unit diversity in only over 100% (Refer to
Databook of Outdoor unit)
- Correction of frost condition on outdoor heat exchanger when in
heating (Refer to Databook of Outdoor unit)

Corrected capacity C of
AHU/FAHU >= air-conditioning
load (for All rooms)
 Calculate corrected capacity C of each indoor unit by multiplying the
total corrected capacity of outdoor unit at  by proportional division of
each indoor unit standard capacity for total standard capacity of all
indoor units.
END
YES
 ' Increase of outdoor unit capactiy.
At the same time, check both
connectable AHU/FAHUs number
and the outdoor unit diversity.

' <Only cooling>
The correction characteristic
of "Connecting pipe length
and Lift" (Refer to Databook
of Outdoor unit) between
increased outdoor unit at

'
and preliminary selected
outdoor unit at
 is different.
(The both graphs are
different.)

' Increase of AHU/FAHU capactiy
at object room against air-
conditioning load.
NO
NO
YES
P20