Bard WA482 Spécifications télécharger pdf (Page 17)

Manual 2100-218

Page 15

Low Pressure Switch, Bypass, and Lockout

Sequence

If the low pressure switch opens for more than 120

seconds, the compressor contactor will de-energize and

go into a soft lockout. Regardless the state of the low

pressure switch, the contactor will reenergize after the

delay on make time delay has expired. If the low

pressure switch remains open, or opens again for longer

than 120 seconds the unit will go into manual lockout

condition and the alarm relay circuit will energize.

Recycling the wall thermostat resets the manual lockout.

Alarm Relay Output

Alarm terminal is output connection for applications

where alarm relay is employed. This terminal is powered

whenever compressor is locked out due to HPC or LPC

sequences as described.

NOTE: Both high and low pressure switch controls are

inherently automatic reset devices. The high

pressure switch and low pressure switch cut out

and cut in settings are fixed by specific air

conditioner or heat pump unit model. The

lockout features, both soft and manual, are a

function of the Compressor Control Module.

ADJUSTMENTS

Adjustable Delay on Make and Delay on Break

Timer

The potentiometer is used to select Delay on Break time

from 30 seconds to 5 minutes. Delay on Make (DOM)

timing on power-up and after power interruptions is equal

to 2 minutes plus 10% of Delay on Break (DOB) setting:

0.5 minute (30 seconds) DOB = 123 second DOM

1.0 minute (60 seconds) DOB = 126 second DOM

2.0 minute (120 seconds) DOB = 132 second DOM

3.0 minute (180 seconds) DOB = 138 second DOM

4.0 minute (240 seconds) DOB = 144 second DOM

5.0 minute (300 seconds) DOB = 150 second DOM

During routine operation of the unit with no power

interruptions the compressor will operate on demand with

no delay.

SERVICE HINTS

1. Caution homeowner to maintain clean air filters at all

times. Also, not to needlessly close off supply and

return air registers. This reduces air flow through the

system, which shortens equipment service life as well

as increasing operating costs.

2. Switching to heating cycle at 75° F or higher outside

temperature may cause a nuisance trip of the remote

reset high pressure switch. Turn thermostat off then

on to reset the high pressure switch.

3. Check all power fuses or circuit breakers to be sure

they are the correct rating.

4. Periodic cleaning of the outdoor coil to permit full

and unrestricted airflow circulation is essential.

SEQUENCE OF OPERATION

COOLING – Circuit R-Y makes at thermostat pulling in

compressor contactor, starting the compressor and

outdoor motor. The G (indoor motor) circuit is

automatically completed on any call for cooling operation

or can be energized by manual fan switch on subbase of

constant air circulation. On all 230 volt units there is a

one minute off delay on the blower motor. 460 volt

models do not have an off delay. On a call for heating,

circuit R-W1 make at the thermostat pulling in heat

contact for the strip heat and blower operation. On a call

for second stage heat, R-W2 makes bringing on second

heat contactor, if so equipped.

COMPRESSOR CONTROL MODULE

The compressor control module is standard on the

WA482 and WA602 models covered by this manual and

is optional on the WA421 model. The compressor

control is an anti-short cycle/lockout timer with high and

low pressure switch monitoring and alarm relay output.

Adjustable Delay On Make And Break Timer

On initial power up or any time power is interrupted to

the unit the delay on make period begins which will be 2

minutes plus 10% of the delay on break setting. When

the delay on make is complete and the high pressure

switch (and low pressure switch if employed) is closed,

the compressor contactor is energized. Upon shutdown

the delay or break timer starts and prevents restart until

the delay on break and delay on make periods have

expired.

During routine operation of the unit with no power

interruptions the compressor will operate on demand with

no delay.

High Pressure Switch and Lockout Sequence

If the high pressure switch opens, the compressor

contactor will de-energize immediately. The lockout

timer will go into a soft lockout and stay in soft lockout

until the high pressure switch closes and the delay on

break time has expired. If the high pressure switch opens

again in this same operating cycle the unit will go into

manual lockout condition and the alarm relay circuit will

energize. Recycling the wall thermostat resets the manual

lockout.

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Bard WA482 Spécifications Page 17

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