ClimateMaster HCLA2090CAR, Installation Instructions Manual

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3.12 AIR-FLOW
The air-handler is equipped with a Variable Frequency Drive (VFD) that provides a
reduction in air-flow in the continuous fan mode, 1 st stage cooling mode, and 1 st stage
heat pump heating mode.
Full air-flow is delivered for the 2 nd stage of cooling mode, 2 nd stage of heat pump
heating mode, and all stages of electric heat. The VFD output frequency and air-flow
level is based on the 24VAC thermostat inputs. Energizing the G low voltage terminal
located on the air-handler low voltage terminal block causes the VFD to operate at 37.5
Hz (63% of full air-flow). Energizing the Y2 or W1 terminals on the low voltage terminal
block causes the VFD to operate at 60Hz (full air-flow). The VFD is programmed at the
factory for optimum performance and therefore requires no adjustment when air-handler
is installed.
The blower performance charts in Section 3.12.2 is based on a dry coil with the factory
1” fiberglass filters in place and the VFD operating at 60Hz (100%). A component resis-
tance chart is provided in Section 3.12.3 to provide the pressure drop for the various
accessories that will need to be added to the external static pressure of the duct system
before selecting a drive package and motor sheave setting. Keep in mind that high effi-
ciency pleated filters will likely have more pressure drop than the factory filters, so that
additional pressure drop will also need to be taken into account. Refer to the filter man-
ufacturer’s pressure drop data for more information.
3.12.1 DRIVE PACKAGE DATA
(-)HCLP2120 Drive Package Data (2nd Stage Operaon)
Drive Belt Motor
Part No. Dia Part No. Dia HP/[KW]
R
1VL40 3.75 AK79H 7.75 A49 2 [1491.4]
S
1VP50 4.75 AK79H 7.75 A50 3 [2237.1]
T 1VP56 5.35 AK79H 7.75 A51 3 [2237.1]
NOTES: 1. Factory sheave sengs are shown in bold type and shaded.
2. Do not set motor sheave below minimum or maximum turns open shown.
3. Re-adjustment of sheave required to achieve rated airflow at AHRI minimum External Sta•c Pressure
4. Drive data shown is for horizontal airflow with dry coil. Add component resistance (below) to duct resistance to determine total External Sta•c Pressure.
586
Sheave Selection
Motor Blower
APROXIMATE BLOWER RPM @ MOTER SHEAVE TURNS OPEN
0 1
2
3 4 5
816 770 723 681 630
952
1040 998 955 912 869 823
1149 1113 1077 1035 996
(-)HCLA2090 & (-)HCLP2090 Drive Package Data (2nd Stage Operaon)
Motor
Drive Belt HP/[KW]
Part No. Dia Part No. Dia
R
1VP50 4.75 AK104 10.25 A50 2.0 [1491.4]
S
1VL-44 4.15
AK71H
6.95 A44 2.0 [1491.4]
T
1VL-44 4.15 AK59 5.75 A42 3 [2237.1]
U
1VP-65 6.5 AK79 7.75 A48 3 [2237.1]
NOTES: 1. Factory sheave sengs are shown in bold type and shaded.
2. Do not set motor sheave below minimum or maximum turns open shown.
3. Re-adjustment of sheave required to achieve rated airflow at AHRI minimum External Sta•c Pressure
4. Drive data shown is for horizontal airflow with dry coil. Add component resistance (below) to duct resistance to determine total External Sta•c Pressure.
Sheave Selection
Motor Blower
APROXIMATE BLOWER RPM @ MOTER SHEAVE TURNS OPEN
0 1 2 3 4 5
773
801
768
732 696 662 627
998 955 911 865 819
1109
1220 1164 1109 1049 990
926
1322 1280 1240 1197 1153
(-)HCLA2090 & (-)HCLP2090 Drive Package Data (2nd Stage Operation)