Sanyo SGP-E120J2GU2, User Manual

Page: 46 / 175

Design
D - 2
1. System Configuration
(1) Procedure for selecting model type and calculating performance
Selection of model type and performance calculation is carried out in accordance with the procedure below.
Calculate
the indoor air conditioning load
Select the air conditioning system
Design the control system
Select the indoor unit type
Provisionally select the indoor
and outdoor unit combination
Performance correction
for indoor/outdoor performance ratio
Check the piping length between
the indoor and outdoor units,
and the difference
between highest and lowest points
Performance correction for
pipe length and difference
between highest and lowest points
Re-confirm the combined p
erformance of indoor
and outdoor units
Fix the piping layout
Calculate
the additional charge amount
Design the electrical
cable capacity
●
For each room or zone, calculate the maximum air conditioning load
●
For each room or zone, select the most suitable air conditioning method using GHP.
●
Individual control, centralized control, central monitoring control, etc. (see the section on Control)
●
Select the cabling capacity depending upon the power supply system used.
If the power supply method to the outdoor unit and indoor units is from a bus system,
then there are limitations. If a bus system is adopted for the indoor units,
then as far as possible it should be done as a system with the outdoor unit.
●
Calculate the additional charge amount from the diameter and length of the refrigerant pipe
on the piping system drawing.
●
Check the minimum indoor capacity and floor area (density limit) for the refrigerant quantity.
If the density limit is exceeded then re-consider the ventilation equipment etc.
●
Design the pipe layout so that the additional refrigerant charge amount is as small as possible.
●
If system expansion is expected, design the pipe layout with this expansion in mind.
●
If the performance of the provisionally selected model type after performance correction is
insufficient, reconsider the configuration.
●
Carry out a performance correction for the air use conditions, piping length (effective length),
and the difference between highest and lowest points.
●
The limitations on an outdoor unit differ depending upon model type, so it is necessary to
investigate locating the equipment so that the length of the refrigerant pipes, and the difference
between the highest and lowest points are within the allowable range.
●
When the total capacity of the indoor units exceeds the capacity of the outdoor unit,
a performance correction is applied.
●
There are limitations on the number of indoor units that can be connected to an outdoor unit.
●
Indoor units up to 200% of the capacity of an outdoor unit can be connected,
but the performance will not be 200%.
●
Select the model type appropriate to the air conditioning system, e.g., ceiling cassette type,
ceiling built-in all duct type, embedded in ceiling type, kitchen type, floor-mounted type, etc.