Johnson Controls MAHP18B21S - Before Installation; Figure 14. DX-Kit in the VRF System

PMGB0406B rev.1
38
DX-Kit is an interface kit designed to control the air handlers using a fan motor control and expansion valve
control depending on the air inlet or outlet temperatures.
The combination capacity of indoor unit against the outdoor unit is selected depending on the outdoor unit
minimum and maximum capacity ratio. Refer to “Installation and Maintenance Manual” for the outdoor unit
to decide the required combination of indoor and outdoor units, and the combination unit capacity.
The following ¿ gure shows an installation example of DX-Kit in the VRF system. The DX-Kit includes a
control box, an expansion valve box, air inlet and outlet thermistors, liquid and gas pipe thermistors, and a
fan motor control board.
The control box should be mounted on the air handler.
17. Before Installation
Item No. Description Item No. Description
1 VRF Outdoor Unit 10 Air Handler
DX-Kit 11 Fan Motor for Air Handler
2 Control Box 12 Liquid Pipe Line
3 Expansion Valve Box 13 Gas Pipe Line
4 Air Inlet Thermistor Probe 14 H-LINK Communication Cable
5 Air Outlet Thermistor Probe 15 Power Supply Wiring
6 Liquid Pipe Line Thermistor Probe 16 Expansion Valve Control Cable
7 Gas Pipe Line Thermistor Probe 17 Wired Controller Connection Cable
8 Fan Motor Wiring 18 Air Inlet of Air Handler
9 Wired Controller 19 Air Outlet of Air Handler
1
2
3
5
7
6
8
9
10
12
13
14 15
17
11
19
18
16
4
:
:
High Voltage Wiring
Low Voltage Wiring
:
Refrigerant Piping
ToOtherIndoorUnit
Figure 14. DX-Kit in the VRF system
17.1 About DX-Kit
(Ins)DX-Kit4e-rev1.indd38
(Ins)DX-Kit4e-rev1.indd38
2016/11/2515:32:48
2016/11/2515:32:48