Specifications

VCES-ERV-IOM-3B – Indoor ERV
31
Appendix H: Electrical Data
Table H1: Blower Motor Full Load Amperage (FLA) – ERV1000i
HP
Voltage
120/1/60 208/1/60 230/1/60 208/3/60 230/3/60 460/3/6 575/3/60
½ 7.7 3.6 3.6 3.0 3.0 1.5 N/A
Minimum Current Ampacity (MCA) Calculation
1.25 x FLA of larger hp motor or compressor = _____
1.25 x heater FLA = + _____
Sum of all other motors FLA = + _____
Wheel drive motor and standard controls FLA = + _____
Indirect gas heater FLA = + _____
Calculated total MCA = _____
Maximum Overcurrent Protection (MOP)
Calculation
2.25 x FLA of larger hp motor or compressor = _____
Electric heater FLA = + _____
Sum of all other motors FLA = + _____
Wheel drive motor and standard controls FLA = + _____
Indirect gas heater FLA = + _____
Calculated total MCA = _____
Actual MOP (from Table H5) = _____
Finding the Actual MOP Value
From the calculated MOP value, select the next smallest
value of protection from Table H5 to get the actual MOP
value (maximum value of overcurrent device).
CAUTION
All electrical installations and wiring require correct wire
gauge sizing and protection according to local building codes.
WARNING
All units equipped with electric postheaters require two-
point power connections
!
Table H2: Blower Motor Full Load Amperage (FLA) – ERV1500i, ERV2000i, ERV3000i
HP
Voltage
120/1/60 208/1/60 230/1/60 208/3/60 230/3/60 460/3/6 575/3/60
½ 9.0 4.5 4.0 1.8 2.2 1.1 0.9
¾ 11.0 5.4 6.0 2.7 2.7 1.4 1.1
1.0 14.0 6.8 7.0 3.1 3.0 1.5 1.2
1.5 20.4 10.2 10.2 4.5 4.4 2.2 1.8
2.0 28.0 14.0 14.0 6.0 5.8 2.9 2.3
3.0 31.0 17.8 17.0 19.0 8.2 4.1 3.3
5.0 N/A 22.0 22.0 14.1 12.8 6.6 5.2
Table H3: Wheel Drive Motor and Controls Full Load Amperage (FLA)
Voltage 120/1/60 208/1/60 230/1/60 208/3/60 230/3/60 460/3/6 575/3/60
4.2 2.4 2.2 2.4 2.2 1.1 0.9
The blower motor FLA values shown above are for one motor only.
Table H4: Electric Preheat Frost Prevention Full Load Amperage (FLA)
kW
Voltage
208/3/60 230/3/60 460/3/60 575/3/60
8 22.2 20.1 10.1 8.0
14 38.9 35.2 17.6 14.1
20 55.6 50.3 25.1 20.1
30 N/A N/A 37.7 30.2
40 N/A N/A 50.3 40.2
Electric postheaters range from 1 to 40 kW and actual FLA values of individual heaters will vary based upon the size, temperature rise and voltage.
Consult the factory for actual FLA values. All electric heaters require three-phase voltage.
IMPORTANT
If this method leads to an actual MOP value being smaller
than the calculated total MCA, then a larger value must
rather be selected, such that the actual MOP is at least
equal to the calculated total MCA.
Table H5: Standard Overcurrent Protection
3 40 250
4 45 300
5 50 350
6 60 400
7 70 450
8 80 500
9 90 600
10 100 650
12 110 700
15 125 750
20 150 800
25 175 850
30 200 900
35 225 1,000