ACC-APG001A-EN
15
Table 3. Heat pump systems
Inputs Outputs
X Y1 Y2
W1/O
W2 G
Supply
Fan On/
Off
Request
Supply
Fan Speed
Request
Compres-
sor Cool
Stage
Request
Compres-
sor Heat
Stage
Request
Auxiliary
Heat
Stage
Request
Heat Cool
Mode
Status
CLOSED OPEN OPEN OPEN OPEN X ON Max None None
Full Stage
Em Heat
OPEN CLOSED OPEN OPEN OPEN X ON Max None
Stage 1
None Heat
OPEN OPEN CLOSED OPEN OPEN X ON Max None
Stage 1
None Heat
OPEN CLOSED CLOSED OPEN OPEN X ON Max None
Full Stage
None Heat
OPEN CLOSED OPEN OPEN CLOSED X ON Max None
Stage 1 Full Stage
Heat
OPEN OPEN CLOSED OPEN CLOSED X ON Max None
Stage 1 Full Stage
Heat
OPEN CLOSED CLOSED OPEN CLOSED X ON Max None
Full Stage Full Stage
Heat
OPEN X X OPEN CLOSED X ON Max None None
Full Stage
Heat
OPEN OPEN OPEN CLOSED OPEN OPEN OFF 0 None None None Cool
OPEN CLOSED OPEN CLOSED OPEN X ON Min
Stage 1
None None Cool
OPEN OPEN CLOSED CLOSED OPEN X ON Min
Stage 1
None None Cool
OPEN CLOSED CLOSED CLOSED OPEN X ON Max
Full Stage
None None Cool
OPEN OPEN OPEN X OPEN CLOSED ON Min None None None
Fan Only
X X X X X X OFF 0 None None None OFF
X=ignored by controller
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