System Selection Procedure; Selection Unit Features; Selection Guide; Capacities And Selection Data - Hitachi MULTIZONE RAM-40NE2F Technical Catalogue

CAPACITIES AND SELECTION DATA

3-2

3.1. SYSTEM SELECTION PROCEDURE

The following system procedure is giving a sample regarding unit selection system, indicating how to use all
parameters showed in this chapter.
3.1.1.

SELECTION UNIT FEATURES

Considering the building distribution, the possible indoor
unit position and the available air flow distribution, select
the unit features that are giving the best efficiency and
comfort to each room.
Decide the Outdoor Unit position getting easy service
maintenance and easy refrigerant pipe installation.
Therefore, the maximum indoor unit capacity combined
with outdoor unit should be carefully considered for correct
indoor unit distribution at each building
3.1.2.

SELECTION GUIDE

The following guide giving the method for indoor and
outdoor unit selection.
∗
Step 1: Determine the system requirements
Calculate the cooling capacity and heating capacity of
each indoor unit according to the following conditions:
Total Load for each room
Item 1
Estimated
kW 2.75
Cooling Load
Estimated
kW 2.90
Heating Load
*Example
Temperature Condition
Cooling
Outdoor Air Inlet Outdoor Air Inlet
• Dry Bulb: 35.0ºC
Indoor Air Inlet Indoor Air Inlet
• Dry Bulb: 27,0ºC
• Wet Bulb: 19.0ºC
*Example
Room
2 3 1+2+3
4.24 5.35 12.34
4.60 6.00 13.50
Heating
• Dry Bulb: 7ºC
• Wet Bulb: 0ºC
• Dry Bulb: 20ºC
∗
Step 2: Select Unit Capacity Performance
The unit kW is selected following the Cooling
capacity and Heating capacity showed in the
combination table.
∗
Step 3: Read Selected Capacity Performance
The unit performance should be calculated
considering the following correction factors:
1. Cooling and Heating piping length
2. Outdoor unit performance capacity
3. Indoor unit performance capacity for each room
cooling load
Kindly refer to the unit selection combination table for
correct capacity performance.