TTHERM GEO TVA series, Installation & Operating Instructions Manual

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12/06/2012 38 GI202
ECM Blower Motor
Hardware and Sequence – GEO-Logic is equipped and programmed to operate with a Modbus/RS485 ECM
motor. Each size motor is characterized to its assigned blower wheel/housing for CFM.
ECM motor start is coincident with stat-Y, W2, E. Programmed within the ECM motor is a 45-second ramp-up
and ramp-down.
The Y2 CFM becomes the reference point. There is a heat and cool Y2 CFM recorded within the GEO-
LOGIC™ board. An 8-position dial switch selects the Y2 CFM relating to applicable installed model size. All
model sizes do not have to be available or active; this is an assignment relating to the dial switch.
Model Size Switch is directly below the 10 terminal thermostat block.
Dial
Switch
Model Size ECM HP
Y2 Heat
CFM
Y2 Cool CFM
0 TVT-024 ¾ 850 979
2 TVA/TVT-036 ¾ 1200 1288
3 TVT-042 ¾ 1312 1442
4 TVA/TVT-048 ¾ 1500 1648
6 TVA/TVT-060 1 1875 2060
The thermostat wired functions have an assigned CFM related to the above. Also, the Y2/Y1 CFM can be
further modified by the thermostat functions.
Stat FL Comp PL/FL Comp Modifier Remarks
O
Determines
heat/cool
Y X 1.00 X 0.75
Y2 X 1.00
G X 0.40 X 0.40
W2 +15% PCC-20
E X 1.00 X 1.00 -20% PCC-22
HUM -15% PCC-21
Y1 and Y2 can be fine-tuned or tweaked with a 4-position dial switch. This relates to both the Y1 and Y2 CFM
for the selected model size dial switch. The 4-positions are 0%, -6%, +6%, +12%.
The Y1 and Y2 tweak switch is found directly below the Model Size Switch.
Note: This table is to show example calculations for Y and Y2 in COOLING
0% -6% +6% +12%
Model Size
Y Y2 Y Y2 Y Y2 Y Y2
TVT – 024 640 980 600 750 680 1040 715 1100
TVT – 036 900 1290 845 1210 955 1370 1010 1445
TVT – 042 985 1440 925 1350 1045 1525 1100 1615
TVT – 048 1125 1650 1060 1550 1195 1750 1260 1850
TVT – 060 1400 2060 1315 1935 1485 2185 1570 2300
CFM Rounded