Figure 25 - Qcc3080C - Qcc3090C Fan Location (Typical); Table 36 - Qcc3080C - Qcc3090C Condenser Fan Control Using Outdoor Ambient Temperature And Discharge Pressure; Table 37 - Qcc3080C -Qcc3090C Condenser Fan Control Using Discharge Pressure Only - Johnson Controls Quantech Millennium QCC3080CZE Installation Operation & Maintenance

FORM QCC3-NM1
ISSUE DATE: 12/19/2023
Condenser fan control: QCC3080C - QCC3090C
TABLE 36 - QCC3080C – QCC3090C CONDENSER FAN CONTROL USING OUTDOOR AMBIENT
TEMPERATURE AND DISCHARGE PRESSURE
(Discharge Pressure Controls Will Not Function Unless The Optional Discharge Pressure Transducer Is Installed)
FAN
ON
STAGE
OAT >25°F (-3.9°C)
1
OR
1 FAN
FWD
DP > Fan Ctrl On Press
OAT >65°F (18.3°C)
*3
OR
2 FANS
DP > Fan Ctrl On Press
FWD
+ 40 psig (2.76 Bars)
TABLE 37 - QCC3080C –QCC3090C CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLy
FAN
ON
STAGE
1
1 FAN DP > Fan Ctrl On Press DP < Fan Ctrl On Press – (Diff. Press.)
FWD
*3
DP > Fan Ctrl On Press
2 FANS
+ 40 psig (2.76 Bars)
FWD
* NOTE: STEP 2 is not active in the "Standard Ambient" mode. When changing to "Low Ambient" control, fan power wiring also changes.
Fan #1
FIGURE 25 - QCC3080C – QCC3090C FAN LOCATION (TyPICAL)
Quantech
OFF
OAT < 20°F (-6.7°C)
AND
DP < Fan Ctrl On Press – (Diff. Press.)
OAT < 60°F (15.6°C)
AND
DP < Fan Ctrl On Press.-
[Diff. Press + 40 psig (2.76 Bars)]
OFF
DP < Fan Ctrl On Press.) –
[(Diff Press.) + 40 psig (2.76 Bars)]
Fan #3
Fan #2
SECTION 8: UNIT OPERATION
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
8M 11M TB7-9 TB10-9
TB7-8 TB10-8
7M 10M
and and and
and
8M 11M
TB10-9
TB7-9
I/O BOARD
CONTACTOR
OUTPUT
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
8M 11M TB7-9 TB10-9
TB7-8
TB10-8
7M 10M
and and and and
8M 11M
TB10-9
TB7-9
Fan #4
LD07403A
FAN #
3 4
1 and 2 and
3 4
FAN #
3 4
1 2
and and
3 4
8
143