Constant Airflow Motors (Ecm) - Bosch LV Series Installation And Maintenance Manual

28 | Fan Motor Options

Constant Airflow Motors (ECM)

For installations where constant air delivery is
critical or where external static pressure drop can
vary greatly (such as with high MERV value filters)
the LV series is offered with a constant air flow
ECM motor option. This option provides ECM
motor efficiency combined with a constant air
delivery across a wide range of external static
pressures. These motors dynamically adjust their
power output to precisely match the desired air
flow on a pre-programmed fan curve. Additionally
these motors feature:
1. A low CFM ventilation feature that circulates
air at 70% of full load when fan only is called.
2. A passive dehumidification mode that reduces
air flow during a cooling call when
dehumidification is also required – this
reduces the sensible heat ratio of the cooling
coil and extends cooling run time to more
effectively dehumidify. (refer to the ECM
Interface Board section of this manual)
Table 7: Constant Airflow Motor Performance Table
Fan Rated
Model
Speed Airflow
A - Low
A -
LV-015
Normal 500
A - Hi
B - Low
B -
LV-018
Normal 650
B - Hi
C - Low
C -
LV-024
Normal 850
C - Hi
D - Low
D -
LV-030
Normal 950
D - Hi
A - Low
A -
LV-036
Normal 1200
A - Hi
A - Low
A -
LV-041
Normal 1200
A - Hi
8 733 905 683 (2013/04)
0.10 0.20 0.30 0.40
450 450 450 450
500 500 500 500
580 580 580 580
550 540 540 540
650 650 650 650
750 750 750 750
720 720 720 720
850 850 850 850
960 960 960 960
810 810 810 810
950 950 950 950
1090 1090 1090 1090
1020 1020 1020 1020
1200 1200 1200 1200
1380 1380 1380 1380
1020 1020 1020 1020
1200 1200 1200 1200
1380 1380 1380 1380
Subject to change without prior notice
3. 3 speed settings per model. Units are factory
set to "NORM" but can be field adjusted to "+"
to increase CFM by 15% or to "-" to reduce
CFM by 15%. (refer to the ECM Interface
Board section of this manual)
4. A "TEST" mode that operates the motor at a
70% torque setting. This setting can be used
to diagnose programming problems in the
motor itself. (refer to the ECM Interface Board
section of this manual)
5. A CFM indicator light that provides a blink for
each 100 CFM of air delivered (note that this
blink code is approximate and should not
replace test and balancing).
Refer to the constant air flow motor performance
tables for heat pump blower performance with the
constant air flow motor option.
0.50 0.60 0.70 0.80
450 450 450 440
500 500 500 480
580 580 580 570
540 540 540 530
650 650 640 630
750 750 740 730
720 720 720 700
850 850 850 850
960 960 960 960
810 810 810 810
950 950 950 950
1090 1090 1090 1090
1020 1020 1020 1020
1200 1200 1200 1200
1380 1380 1380 1380
1020 1020 1020 1020
1200 1200 1200 1200
1380 1380 1380 1380
LV Heat PumpSeries
0.90 1.00 1.10 1.20
440 430 - -
470 460 - -
560 550 - -
520 500 - -
610 590 - -
710 690 - -
650 560 - -
800 700 - -
880 790 - -
810 810 - -
950 950 - -
1090 1090 - -
1020 1020 - -
1200 1200 - -
1380 1380 - -
1020 1020 - -
1200 1200 - -
1380 1380 - -
LV Heat Pump Series