Thermo-pride OH5-85DE User Manual download pdf (Page 15)

All installations and services must be performed by qualified service personnel.

OH5 2-STAGE

CFM

Factory shipped

settings

G. ECM SPECIFIC REPLACEMENT PARTS

Part Name OH5/OH2 OH11 OL5/OL2 OL11 OC5/OC2

OH5

2-STAGE

ECM Motor

AOPS7443/

AOPS7449

AOPS7444 AOPS7445/

AOPS7450

AOPS7446 AOPS7448/

AOPS7447

AOPS7454

Control Board 350915 350915 350915 350915 350915 350184

Motor Power Harness 350917 350917 350918 350918 350917 350917

Motor Control Harness 350920 350920 350921 350921 350920 350183

Burner Harness 350916 350916 350916 350916 350928 350182

Transformer 350464 350464 350464 350464 350464 350464

III. ECM TROUBLE SHOOTING

A. DIAGNOSTC FEATURES

The control board is equipped with 4 green Input Status LEDs and 1 red Board Status LED. These are intended to

provide a quick view into furnace performance without requiring a voltmeter.

The green Input Status LEDs are driven by the “Y”, “W”, “G”, and “DEHUM” inputs and are located directly

below those inputs. They will light to indicate the presence of these signals.

The red Board Status LED has two functions:

It will light when the board recognizes a valid input signal and will stay lit until all valid signals are removed.

This is intended to show that the board is functioning and able to respond to input signals.

It will flash rapidly while120VAC is missing from the LIMIT switch. This is intended to give a quick visual

indication of the High LIMIT switch.

SW1

SETTING TONS

COOL LOW

SW1 LOW FIRE

HIGH FIRE

SETTING CFM RISE

CFM RISE

3 OFF

2 ON

6 OFF

5 OFF

4 ON

2 726 352

1 OFF

800 81 1008 78

3 OFF

2 ON

6 OFF

5 OFF

4 ON

2.5 924 462

1 ON

905 72 1121 70

3 ON

2 OFF

1 OFF

960 68 1200 66

6 OFF

5 ON

4 ON

3 1276 638

6 ON

5 OFF

4 OFF

3.5 1474 726

6 ON

5 OFF

4 ON

4 1600 814

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21

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Thermo-pride OH5-85DE User Manual Page 15

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