Thermo Pride OH5-85DE - Manual (Page 15)

All installations and services must be performed by qualified service personnel.
OH5 2-STAGE
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
13