System Configuration; Types And Maximum Allowable Length Of Cables - Mitsubishi Electric City Multi PUHY-P500YSHM-A Service Handbook

[ II Restrictions ]
II Restrictions

[1] System configuration

1. Table of compatible indoor units
Do not connect the indoor unit to an outdoor unit other than the PUHY-P500YSHM-A.
Be sure to connect the indoor unit and outdoor unit on a one-to-one basis.
Indoor Unit Model Names
PFAV-P500VMH-E

[2] Types and Maximum allowable Length of Cables

1. Wiring work
(1) Notes
1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man-
ual.
2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Do not put the control cable and power supply cable in the same conduit tube.)
3) Provide grounding for the outdoor unit as required.
4) Run the cable from the electric box of the indoor or outdoor unit in such way that the box is accessible for servicing.
5) Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic compo-
nents on the terminal block.
6) Use 2-core shielded cables as transmission cables.
Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor
units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and
malfunctions.
Outdoor unit
TB TB TB TB
3 7 3 7
TB TB TB TB
3 7 3 7
(2) Control wiring
Different types of control wiring are used for different systems.
Refer to section "[4] An Example of a System to which an MA Remote Controller is connected" before performing wiring work.

Types and maximum allowable length of cables

Control lines are categorized into 2 types: transmission line and remote controller line.
Use the appropriate type of cables and observe the maximum allowable length specified for a given system. If a given system
has a long transmission line or if a noise source is located near the unit, place the unit away from the noise source to reduce
noise interference.
HWE07150
Outdoor Unit Model Names
PUHY-P500YSHM-A
(PUHY-P250YHM-A × 2)
Indoor unit
2-core shielded cable
Remote Controller
2-core shielded cable
TB3: Terminal block for indoor-outdoor transmission line TB7: Terminal block for centralized control
Outdoor unit
TB TB TB TB
3 7 3 7
multiple-core cable
TB TB TB TB
3 7 3 7
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Indoor unit
Remote Controller
GB