System Configurations; Schematic Diagrams Of Individual And Multiple Systems - Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions

4. System Configurations

Test run procedural flow
1. System startup (*)
Configure the settings needed for the local system.
Refer to page 25 for details.
2. Air bleeding operation
Operate the unit's pump to perform the air bleeding operation.
Refer to page 36 for details.
3. Water flow rate adjustment operation
Adjust the unit's pump and flow rate adjustment valve.
Refer to pages 38 and 40 for details.
* If multiple units are connected to the same water circuit, perform the water flow rate adjustment operation for each unit simultaneously.
(*)
Request at the Time of a Test Run
Set the slide switch SWS2 on the board inside the control box to the "lower side" during the test run.
By default, it is set to the "upper side" for forced stop of the pump and compressor to prevent the pump being
damaged by the anti-freezing process in no water passing status or valve closed status before the test run.

[1] Schematic Diagrams of Individual and Multiple Systems

(1) Individual system
* Each unit is operated individually by connecting a dry contact switch/relay to each unit.
External
temperature
sensor
Field-supplied dry contact
switch/relay or remote
controller (PAR-W31MAA) or
centralized controller (AE-200)
Refer to the sections "[2] Switch Types and the Factory Settings" (page 25) and
"(3) System configuration procedures: Individual system" (page 30) for further details.
(2) Multiple system (2-16 units)
* A group of unit that consists of one main unit and up to 15 sub units is operated collectively by connecting an external water temperature sensor and a dry
contact switch/relay to the main unit.
External
temperature
sensor
Field-supplied dry contact
switch/relay or remote
controller (PAR-W31MAA) or
centralized controller (AE-200)
Refer to the sections "[2] Switch Types and the Factory Settings" (page 25) and
"(4) System configuration procedures : Multiple system" (page 32) for further details.
Unit (MAIN circuit)
PCB
Field-supplied dry contact
controller (PAR-W31MAA) or
centralized controller (AE-200)
Unit (MAIN circuit)
PCB
MAIN unit
Inter-unit wiring
(M-NET line)
Unit (MAIN circuit)
External
temperature
sensor
switch/relay or remote
Unit (MAIN circuit)
PCB
SUB unit
GB-24
PCB
Unit (MAIN circuit)
PCB
Inter-unit wiring
(M-NET line)
SUB unit(s)
n units