Service Functions, Table.1 | Mitsubishi Electronics MSH-24NV

SERVICE FUNCTIONS

1.COMPULSORY DEFROSTING MODE FOR SERVICE

By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. See Page 56 and 59.

Defrost thermistor RT61 must read below -3°C

2.DEFROST TERMINATION CHANGE

<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 56 and 59.) <JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 56 and 59.)

MODEL			Junper wire	Change point
MSH-07/09/12NV-		E1 E2	JPC	Defrost interval time changes from 40 minutes to 15 minutes
			JPC	Defrost interval time changes from 40 minutes to 15 minutes
MSH-18NV- E1	E2	E3
MSH-18NV- E1	E2	E3	JPE	Deforst start temperature changes from -3:to 0:
MSH-24NV- E1	E2			Deforst start temperature changes from -3:to 0:
MSH-24NV- E1	E2			Deforst finish temperature changes from 3.1: to 10.1:.
				Deforst finish temperature changes from 3.1: to 10.1:.

3. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.

The time will be shortened as follows.
3-minute delay : 3-minute ➔ 3-second.
AUTO START : 1 hour ➔ 1-minutes	} Short the connector during the timer mode.
AUTO STOP : 1 hour ➔ 1-minutes	} Short the connector during the timer mode.

4.P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit.

(1)<The reset button can be located on the rear side.>

MSH-07NV - E1 MSH-18NV - E2

MSH-09NV - E1

MSH-12NV - E1

MSH-18NV - E1

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

NOTE : For remodeling, take out the batteries at first.

After finish remodeling, put back the batteries then push the RESET button.

Originally, chip parts are fitted on J10/J20 side and there is no chip parts on the other side.

Remove the chip parts of J10/J20 side and connect Jumper wire to J11/J21 side as shown in Table 1. Either J1O or J11 /J20 or J21 should be attached for normal operation.

Table.1

	1 unit operation	2 units operation	3 units operation	4 units operation

No. 1 unit	No modification	Same as at left	Same as at left	Same as at left

No. 2 unit	–	Replace J10 with J 11	Same as at left	Same as at left
No. 3 unit	–	–	Replace J20 with J 21	Same as at left

No. 4 unit	–	–	–	Replace J10 with J11
No. 4 unit	–	–	–	Replace J20 with J21
				Replace J20 with J21

NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When the power supply is turned on and indoor unit receives the first signals from the remote controller, the remote controller number is designated as the indoor unit number. Therefore at and after the second time indoor unit accepts the remote controller of the initial setting number.

At setting - error, turn the power supply off to cancel the individual operation and then turn the power supply on to restart the setting.

MSH-07NV, MSH-09NV, MSH-24NV, MSH-12NV, MSH-18NV specifications

Mitsubishi Electronics has long been recognized for its innovative heating and cooling solutions, particularly in the HVAC industry. Among its notable offerings are the MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models, which showcase advanced features and technologies to enhance indoor climate comfort.

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The MSH series incorporates advanced filtration systems designed to improve indoor air quality. These systems capture dust, pollen, and other allergens, ensuring that the air circulated in residential or commercial spaces remains clean and healthy. Some models feature a dual-layer filter that further enhances dust and odor removal, providing a more comfortable environment for occupants.

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The control mechanisms of the MSH models are user-friendly and versatile. They come equipped with an intuitive remote control, allowing users to easily adjust temperature settings and modes from across the room. Additionally, some models offer smart connectivity features, enabling integration with smart home systems for added convenience and control via mobile devices.

Durability is another key aspect of Mitsubishi's MSH series. They are constructed with high-quality materials designed to withstand various environmental conditions, ensuring longevity and reliable performance. The outdoor units are particularly resilient, featuring weather-resistant components that allow them to operate effectively even in extreme temperatures.

In conclusion, Mitsubishi Electronics' MSH-18NV, MSH-12NV, MSH-24NV, MSH-09NV, and MSH-07NV models represent a blend of energy efficiency, advanced air filtration, user-friendly controls, and durable construction. These units reflect Mitsubishi's commitment to providing high-quality heating and cooling solutions that cater to a wide range of residential and commercial needs while ensuring comfort and convenience for users.