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General Requirements and Specifications
CAUTION
This unit must be installed in a dry place, in a non-corrosive, well-ventilated environment, without excessive dust.
The ambient temperatue must be over 10°C and under 27°C. If the ambient temperatue is 10°C or less, the plenum
must be insulated on 10 ft linear minimum length.
1. LOCATION – The furnace should be centrally located to the heating area.
2. POSITIONS – It can be installed for vertical, horizontal or downflow operation. When installed horizontally, the
furnace should be positioned such as the door will not end up being on the top. The door should be on the side of
the furnace, to ensure that the motor bearings are in their designed position. In vertical downflow installations, use
only “L”- or “T”-shaped plenum with no openings or registers directly below furnace.
3. INSTALLATION CLEARANCES – As shipped from the factory, each unit is approved for “zero inch” clearance. If
additional clearance is required, it will be indicated on the data label attached to the furnace.
4. TEMPERATURE RISE – Furnaces are shipped to operate at 0.20” W.C. (50 Pa) external static pressure. They are
certified for operation up to 0.50” W.C. (125 Pa). Check below for temperature rise table on specification chart and,
if necessary, adjust the unit to match.
5. SERVICE CLEARANCE – Units are serviced from the FRONT. Leave at least 24” (610 mm) clearance in front of
the door.
240 VOLTS - SINGLE PHASE
TEMPERATURE RISE
@ 0.20" W.C.
MODEL NO.
KW
BTUH
AMPS INCL. MOTOR
HP
°C
°F
SPEED*
21ECM10
10
34121
46
1/3
24
42
LOW
21ECM15**
15
51182
67
1/3
25
46
MED
21ECM18**
18
61419
77
1/3
30
55
MED
21ECM20**
20
68243
86
1/3
34
60
MED
21ECM23**
23
78479
97
1/3
39
70
MED
STATIC PRESSURE
FLOW
(INCHES OF WATER COLUMN)
SPEED
RATE
0.2
0.3
0.4
0.5
0.6
LOW
CFM
740
585
435
365
300
L/s
349
276
205
172
141
MED
CFM
1040
995
945
900
860
L/s
491
470
446
425
406
HIGH
CFM
1130
1095
1045
1015
965
L/s
533
517
493
479
455
WARNING:
* FACTORY SETTINGS.
** These models must NOT be setup to run continuously at LOW speed as it will cause overheating conditions. These
models are certified to run only at HIGH and MED speeds.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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