Bard P1124A2 Motor starts but runs erratically, Excessive noise, ∃ Perform Moisture Check

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