Sanyo THX1852, UHX2452, UHX0752, UHX1252 Test Run Procedure, Items to Check Before the Test Run

The unit with the unit No. set to 1 is the main unit. All other units are sub units.

Test Run

1. Test Run

2. Test Run Procedure

Recheck the items to check before the test run.

	Have the outdoor sub units been connected?	NO
	YES	*1
<Outdoor unit control PCB>	*1
Unit No. setting switch	Set the unit address.
(S007)

Items to Check Before the Test Run

1.Turn the remote power switch on at least 5 hours before the test, in order to energize the crankcase heater.

2.After performing the leak inspection, applying vacuum, and performing refrigerant charge for the tubing which is connected on-site, fully open the outdoor unit service

valve. However if only one outdoor unit is installed, a balance tube is not used. Therefore, leave the valve fully closed.

<Outdoor unit control PCB>

3. When replacing the control PCB, be sure that the settings

Unit No. setting switch

Set the No. of outdoor units.

on the new PCB match those on the old PCB.

(S006)

4. Use caution when making the settings. If there are dupli-

<Outdoor unit control PCB>

cated system addresses, or if the settings for the Nos. of

Unit No. setting switch

Set the No. of indoor units.

the indoor units are not consistent, an alarm will occur

(S004 and S005)

and the system will not start.

5. These settings are not made on the indoor unit PCB.

(Check the link wiring.)

Are the inter-unit control wires

NO

CASE 1

connected to more than 1 refrigerant

system?

<Outdoor unit control PCB>

YES

Unit No. setting switch

Set the system address.

(S002 and S003)

When multiple outdoor main units exist, disconnect the terminals

Note: It is not necessary to remove

extended from the shorted plugs (CN003) at all outdoor main unit

the socket that is used to short-

PCBs except for 1.

circuit the terminal plugs from

Alternatively, move the sockets to the OPEN side.

the outdoor sub unit PCBs.

YES

CASE 2

Is it possible to turn ON the power only

for the 1 refrigerant system where the

test run will be performed?

Turn ON the indoor and

NO

outdoor unit power for that

refrigerant system only.

Will automatic address setting be

Make necessary corrections.

Short-circuit the automatic address pin (CN100)

NO

performed in Heating mode?

on the outdoor main unit PCB for 1 second or

longer, then release it.

CASE 3B

YES

CASE 3A

Turn OFF the indoor and

outdoor unit power.

Is it OK to start the compressors?

Is it OK to start the compressors?

LED 1 and 2 blink alternately

Check the alarm contents.

(about 2 or 3 minutes).

Turn ON the indoor and

Turn ON the indoor and

NO

outdoor unit power.

outdoor unit power.

Are LED 1 and 2 on the

*2

*2

Make necessary

outdoor unit PCB OFF?

Short-circuit the mode change pin

corrections

Refer to "Table of Self-

Short-circuit the automatic address

(CN101) on the outdoor main unit PCB.

pin (CN100) on the outdoor main

Diagnostic Functions and

Description of Alarm Displays."

YES

At the same time, short-circuit the

unit PCB for 1 second or longer,

Turn OFF the indoor

automatic address pin (CN100) for 1

then release it.

and outdoor unit

second or longer, then release it.

1

2

3

4

*3		*3
Start indoor and outdoor unit		Start indoor and outdoor unit
cooling operation.			heating operation.
LED 1 and 2 blink alternately.		LED 1 and 2 blink alternately.
			NO
	Are LED 1 and 2 on the
	outdoor unit PCB OFF?

YES

Check the alarm

contents.

*2 A minimum of 5 hours must have passed after the power was turned ON to the outdoor unit.

*3 All indoor units operate in all refrigerant systems where the power is ON.

5

Check that test run preparation is OK.

(Do not allow the short-circuited pins to remain short-circuited.)

	Set the wired remote controller for test run.
Refer to the remote			NO	Check and make corrections according to
controller test-run	Does system operate?
settings.				"Table of Self-Diagnostic Functions."
		YES
	Return remote control to normal mode
	End test run.

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