Installation and Service Manual

16
6-584.13
ELECTRICAL CONNECTIONS
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 HDC 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 21.
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.
INSTALLATION - ELECTRICAL CONNECTIONS
Blower Curve Models (HDC 60-125 Only)
Speeds
Low Medium High
65
60
55
50
45
40
35
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
1140
1235
1347
1481
1646
1852
2116
External Static Pressure (IN. WC)
Temperature Rise (Deg. F)
HDC 100
CFM
70
65
60
55
50
45
40
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
1235
1323
1425
1543
1684
1852
2058
2315
External Static Pressure (IN. WC)
Temperature Rise (Deg. F)
75
HDC 125
CFM
70
65
60
55
50
45
40
35
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
794
855
926
1010
1111
1235
1389
1587
External Static Pressure (IN. WC)
Temperature Rise (Deg. F)
CFM
HDC 75
70
65
60
55
50
45
40
35
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
635
684
741
808
889
988
1111
1270
External Static Pressure (IN. WC)
Temperature Rise (Deg. F)
CFM
HDC 60