6
screw bridging the split portion of the collar. The cap
screw has a Torx T25 socket head. To tighten the locking
collar: Hold the locking collar tightly against the inner
race of the bearing and torque the cap screw to 65--70
in-lb (7.4--7.9 Nm). See Fig. 7.
LOCKING COLLAR
T-25 TORX SOCKET
HEAD CAP SCREW
C11505
Fig. 7 -- Tightening Locking Collar
STAGED AIR VOLUME (SAV) CONTROL:
2 SPEED FAN WITH VARIABLE
FREQUENCY DRIVE (VFD)
Staged Air Volume (SAV) Indoor Fan Speed
System
NOTE
: The SAV option is not available on units with
Humidi--MiZer
®
adaptive humidification system.
The SAV system utilizes a Fan Speed control board and
Variable Frequency Drive (VFD) to automatically adjust
the indoor fan motor speed in sequence with the unit’s
ventilation, cooling and heating operation. Conforming to
ASHRAE 90.1 2010 Standard Section 6.4.3.10.b, during
the first stage of cooling operation the SAV system will
adjust the fan motor to provide two--thirds (2/3) of the
design airflow rate for the unit. When the call for the
second stage of cooling is required, the SAV system will
allow the design airflow rate for the unit established
(100%). During the heating mode, the SAV system will
allow total design airflow rate (100%) operation. During
ventilation mode, the SAV system will operate the fan
motor at 2/3 speed.
Identifying Factory Option
This supplement only applies to units that meet the
criteria detailed in Table 1. If the unit does not meet that
criteria, discard this document.
Table 1 – Model--Size / VFD Option Indicator
Model / Sizes
Position in
Model Number
VFD FIOP
Indicator
48HC 17 --- 28
17
G, J
NOTE
: See Fig. 9 for an example of typical Model
Number Nomenclature.
Unit Installation with SAV Option
48HC Rooftop —
Refer to the base unit installation
instructions for standard required operating and service
clearances.
NOTE
: The Remote VFD Keypad is a field--installed
option. It is not included as part of the Factory installed
VFD option. See
“Variable Frequency Drive (VFD)
Installation, Setup and Troubleshooting Supplement”
for
wiring schematics and performance charts
and
configuration. See Fig 8, for location of the (VFD) as
mounted on the various 48HC models.
VARIABLE
FREQUENCY
DRIVE (VFD)
C11531
Fig. 8 -- VFD Location for 48HC 15--27.5 Units
48H
C
Содержание 48HC D17 Series
Страница 76: ...76 APPENDIX IV WIRING DIAGRAMS C12615 Fig 76 48HC D17 D28 Control Diagram 208 230 3060 460 575 3 60 48HC...
Страница 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Страница 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Страница 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Страница 80: ...80 APPENDIX IV WIRING DIAGRAMS C14061 Fig 80 48HC D17 D28 Control Diagram with Humidi MiZer 48HC...
Страница 81: ...81 APPENDIX IV WIRING DIAGRAMS C12620 Fig 81 48HC D17 D28 Power Diagram 208 230 3 60 with Humidi MiZer 48HC...
Страница 82: ...82 APPENDIX IV WIRING DIAGRAMS C12621 Fig 82 48HC D17 D28 Power Diagram 460 3 60 with Humidi MiZer 48HC...
Страница 83: ...83 APPENDIX IV WIRING DIAGRAMS C12622 Fig 83 48HC D17 D28 Power Diagram 575 3 60 with Humidi MiZer 48HC...
Страница 85: ...85 APPENDIX IV WIRING DIAGRAMS C13766 Fig 85 PremierLinkt System Control Wiring Diagram with Humidi MiZer 48HC...
Страница 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Страница 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
