Alliance Laundry Systems BU170S Service Manual download pdf (Page 72)

70

70422201R1

On Premise Micro Control (RM) Troubleshooting

42.Unit Will Not Heat – Gas/Steam

Is there

voltage to the

N.O. terminal

of the airflow

switch?

Unit Will Not

Heat – Gas

Is there

voltage at H2-5

and H3-4 of

control?

Is there

voltage on BRN

wire on motor

contactor?

Yes

Replace

thermistor.

Correct wiring

between H2-5 and

motor contactor.

No

Is there

voltage to the

input of the

cabinet limit?

No

Correct wiring

between cabinet

limit and terminal

5 of fan motor.

Is there

voltage to the

output of the

cabinet

limit?

No

Check cabinet

limit for proper

operation.

Replace

if necessary.

TMB2359S-a

Yes

No

Correct wiring

between airflow

switch and

cabinet limit.

Is there

voltage to the

common of the

airflow

switch?

Yes

Is there

voltage at ORG/WHT

wire on motor

contactor?

Yes

All voltage checks are referenced

to transformer neutral.

(1)

(4)

(8)

(9)

(2)

Note: Tests are conducted with

unit running and calling for heat.

Is the

thermistor

operational?

No

Replace

control.

(5)

Replace motor

contactor.

No

Yes

No

(3)

Check for proper

operation of

airflow switch.

Replace if

necessary.

Yes

No

Is there

voltage to the

input of the

stove limit?

Correct wiring

between stove

limit and normally

open terminal of

the airflow switch.

(10)

Yes

No

Continued on

next page

Yes

Is there

voltage to terminal 3

of the motor

contactor?

(6)

Correct wiring

between motor

terminal 3 and

motor contactor.

Is there

voltage at terminal

5 of the fan

motor?

No

Yes

Yes (Gas)

Yes (Steam)

Check motor for

proper operation.

Replace if

necessary.

No

(7)

Yes

See next

page

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 119 120

Comments to this Manuals

No comments