Wiring/Blower Speed Adjustment - Modine Manufacturing HD Series Installation And Service Manual

InsTAllATIon - eleCTrICAl ConneCTIons
eleCTrICAl ConneCTIons
WARNING
1. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage.
2. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than rated
voltage.
cAUTION
operATIon
Ensure that the supply voltage to the appliance, as indicated
on the serial plate, is not 5% less than the rated voltage.
All field installed wiring must be done in accordance with the
National Electrical Code ANSI/NFPA 70 – latest edition or
Canadian Electrical Code CSA C22.1 Part 1 or local codes. Unit
must be electrically grounded according to these codes. If any
of the original wire supplied with the heater must be replaced,
replace it with wiring material having a temperature rating of at
least 105°C.
The power to these unit heaters should be protected with a
circuit breaker.
Location of thermostat should be determined by heating
requirements and be mounted on an inside wall about 5' above
floor level where it will not be affected by heat from the unit
or other sources, or drafts from frequently opened doors. See
instructions packed with thermostat.
Wiring Adjustments for Blower motors
The blowers used on Modine HDB units are direct drive and
equipped with three speed motors. Air temperature rise of the
unit is determined by the speed setting and the amount of static
pressure in the system. Units are normally shipped with motors
set at high speed. Motor speed is changed by connecting the
motor lead for the desired fan speed to the "EAC" or "BLO"
terminal of the control board. Unused motor leads for other
speeds are placed on the "PARK" terminals of the board. See
the wiring diagram on page 20.
When applying a blower equipped unit to a duct system or
other load, consult the performance curves on this page to
determine the air temperature rise for a given motor speed
range and static pressure. Verify that the static pressure on the
outlet of the unit does not exceed the maximum specified for
the unit. If static pressure is too high it must be reduced either
by modifications to the system or using the medium or low
motor speed. If the unit shuts down on high limit during normal
operation, a higher motor speed should be used.
Blower Curve models (HdB 60-125 only)
Low
70
65
60
55
50
45
40
35
0.00 0.10
70
65
60
55
50
45
40
35
0.00 0.10
65
60
55
50
45
40
35
0.00 0.10
75
70
65
60
55
50
45
40
0.00 0.10
6-583.6
speeds
Medium
HdB 60
0.20 0.30 0.40 0.60
0.50
External Static Pressure (IN. WC)
HdB 75
0.20 0.30 0.40 0.60
0.50
External Static Pressure (IN. WC)
HdB 100
0.20 0.30 0.40 0.50 0.60 0.70
External Static Pressure (IN. WC)
HdB 125
0.20 0.30 0.40 0.50 0.60
External Static Pressure (IN. WC)
High
635
684
741
808
889
988
1111
1270
0.70
794
855
926
1010
1111
1235
1389
1587
0.70
1140
1235
1347
1481
1646
1852
2116
0.80
1235
1323
1425
1543
1684
1852
2058
2315
0.70 0.80
13