2. The fan output for indoor fan operation energizes with any cooling output after the indoor
fan cool on delay expires.
3. When the thermostat cooling inputs are lost and the minimum runtime expires, the
compressor outputs stage off (the default is 3 minutes).
4. A 30 second interstate delay occurs when multiple stages are requested.
Table 28: Compressor control DSH096C
Control
Compressor
Power type
Evaporator fan %
Y1
1
Power
50%
Y2
1
Solenoid
60%
Y3
2
Power
100%
Table 29: Compressor control DSH120C
Control
Compressor
Power type
Evaporator fan %
Y1
1
Power
50%
Y2
2
Power
60%
Y3
2
Solenoid
75%
Y4
1
Solenoid
100%
IntelliSpeed™ supply fan control (8/10 ton unit only)
Setpoints and related data are shown in
Table 30: Setpoints and related data
Fan control type
Fixed
Variable
Occupied, no heat or cool % command
50%
0–100%
Occupied, one stage of cool % command
50%
50–100%
Occupied, two stage of cool % command
60%
50–100%
Occupied, three stage of cool % command
75%, 100%
50–100%
Occupied, four stage of cool % command
100%
50–100%
Occupied, one stage of heat % command
0–100%
Occupied, two stage of heat % command
0–100%
Occupied, three stage of heat % command
0–100%
Economizer minimum position
0–100%
Economizer minimum position for low speed fan
0–100%
The outputs have the following values:
•
24 VAC from fan on the unit control board (UCB) to enable indoor VFD
•
2–10 VDC from VFD terminal on UCB to control the speed of the indoor VFD
The VFD operation has the following values:
•
2–10 VDC output from VFD terminal on UCB operates the supply fan VFD proportional to the
minimum and maximum frequency settings of the VFD (the defaults are 30–60hz)
47
Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller
Johnson Controls
