SYMPTOM

Motor starts but runs erratically

Varies up and down or intermittent

"Hunts" or puffs" at high CRM (speed)

Stays at low CFM despite sysstem call for cool or heat CFM

Stays at high CFM

Blower wo'nt shut off

SYMPTON

Excessive noise

Air Noise

CAUSE / PROCEDURE

Check line voltage for variation or "sag"

Check low voltage connections (G, Y, W, R, C) at motor; unseated pins in motor harness connectors

Check "Bk" for erratic CFM command (in variable speed applications

Check out system controls - thermostat?

Perform Moisture Check

Does removing panel or filter reduce "puffing"?

Reduce restriction

Reduce maximum airflow

Check low voltage (thermostat) wires and connections

Verify fan is not in dalay mode - wait until delay is complete

"R" missing / not connected at motor Perform motor / control replacement check

"R" missing / not connected at motor

Is fan in dalay mode? - wait until delay time complete

Current leakage from controls into G, Y or W?

Check for Triac switched thermostat or solid state relay

CAUSE / PROCEDURE

Determine if it is air noise, cabinet, duct or motor noise . Interview customer if necessry.

High static creating high blower speed?

Is airflow set properly?

Does removing filter cause blower to slow down? Check / replace filter

Use low pressure drop filter

Check / correct duct restirctions

DO

Size the equpment wisely

Check orientation before inserting motor connectors

DON'T

Oversize system then compensate with low airflow

Plug in power connector backwards

Force plugs

MOISTURE CHECK PROCEDURE

COMFORT CHECK PROCEDURE

Connectors are oriented "down"

Check proper airflow settings

Arrange harnesses with "drip loop" under motor

Low static pressure for lowest noise

Condenste drain plugged?

Set low continuous fan CFM

Check for low airflow (too much latent capacity)

Use humidistat and 2-speed cooling units

Check for undercharged condition

Use zoning controls designed for ICM that regulate CFM

Check and plug leaks in reutrn ducts and cabinet

Thermostat in bad location?

 

 

 

 

Manual

2100-353

 

 

Page

24

 

 

Page 26
Image 26
Bard P1124A2, P1248A2, P1230A1, P1236A1, P1148A2 Motor starts but runs erratically, Excessive noise, ∃ Perform Moisture Check

P1230A1, P1124A2, P1148A2, P1236A1, P1248A2 specifications

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