2 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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