Troubleshooting: Cooling Sequence of Operation (Continued)
CALL FOR COOLING
1
1ST STAGE COOLING REQUEST RECEIVED 1
WAIT FOR COMPRESSOR TIMED
OFF DELAY TO EXPIRE
ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN)
INDOOR BLOWER 2
SECOND ON DELAY
ENERGIZE INDOOR BLOWER | 2 |
(LOW COOLING MODE) |
MAINTAIN INDOOR
BLOWER
(LOW COOLING MODE)
YES
YES
| 1 |
|
| 1ST STAGE | |
2ND STAGE |
|
|
|
| |
|
| NO |
| COOLING REQUEST | |
COOLING |
|
|
| ||
|
|
| |||
|
|
|
| STILL ACTIVE? | |
REQUEST? |
|
|
|
| |
YES
YES
ENERGIZE 2ND STAGE |
| ENERGIZE INDOOR BLOWER |
|
COOLING CONTACTOR |
| (HIGH COOLING MODE) | 2 |
(COMPRESSOR & FAN) |
|
|
|
|
|
|
|
| NO | |
2ND STAGE |
| MAINTAIN INDOOR BLOWER | |
COOLING REQUEST | YES | ||
(HIGH COOLING MODE) | |||
STILL ACTIVE? |
| ||
|
| ||
NO |
|
| |
DE−ENERGIZE 2ND |
|
| |
STAGE COOLING |
|
| |
CONTACTOR |
|
| |
(COMPRESSOR & FAN) |
|
| |
1ST STAGE |
| ENERGIZE AND MAINTAIN | |
COOLING REQUEST | YES | ||
INDOOR BLOWER AT | |||
STILL ACTIVE? |
| (LOW COOLING MODE) | |
|
| ||
NO |
|
|
DE−ENERGIZE 1ST
STAGE COOLING
CONTACTOR
(COMPRESSOR & FAN)
DE−ENERGIZE INDOOR
BLOWER 2
1CONTROL WILL NOT RESPOND TO A 2ND STAGE COOLING REQUEST UNLESS A 1ST STAGE COOLING REQUEST IS ACTIVE.
2INDOOR BLOWER LOW COOLING MODE AND HIGH COOLING MODE HAVE SPECIFIC ON, OFF AND SPEED RAMPING PROFILES. THE SPECIFIC PROFILE IS SELECTED USING THE
DIP SWITCHES ON THE CONROL.
1
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