GENERAL REQUIREMENTS AND SPECIFICATIONS (CONT’D)
OPERATING OPTIONS
The furnace is shipped from the factory in a “Standard Heating Mode”
(narrow switches in the Down position, wide switch in the Middle—or
Off—position). When the thermostat calls for heat, the automatic con-
trols will be activated and the furnace turns “ON”.
The blower will run at low speed or higher speed (as selected by
Speed Selector switch).
As the furnace heats up, it automatically switches to a medium speed
when additional elements are activated by the electronic control, if it
was initially set to run at low speed. The timing of this blower speed
change will depend on whether “Cold” or “Mild” is selected on the
Season Select switch.
You may, however, change from the Standard Heating Mode by using
the controls built into your furnace.
S
PEED
S
ELECTOR
S
EASON
S
ELECT
C
ONTINUOUS
S
PEED
H
IGH
M
ILD
C
OLD
L
OW
H
EAT
O
FF
N
O
H
EAT
The Speed Selector switch is used to
control the fan speed. It is also used in
conjunction with the Continuous Speed
switch.
“Low” – The blower motor will operate at
low speed.
“High” – The blower motor will operate at
a higher speed.
During spring or fall, you may require less
rapid response when the thermostat calls for
heat.
When “Mild” is selected, it takes more time to
bring all the elements online.
When “Cold” is selected, the heating elements
come online faster.
When the “Low Heat” switch is selected only
one element will offer continuous warmth.
The blower will run continuously at either
Low or High speed as selected by the Speed
Selector switch.
When “No Heat” is selected the blower will
run continuously at either Low or High speed
as selected by the Speed Selector switch.
When “OFF” is selected the blower is not
engaged.
L
OW
*FACTORY SETTINGS. SUBJECT TO CHANGE WITHOUT NOTICE.
WARNING:
**This speed can only be run with heater off, for cooling/ventilation purposes only.
240 VOLTS – SINGLE PHASE
TEMP. RISE @ 0.20 in. W.C.
MODEL NO. kW BTUH AMPS INCL. MOTOR HP
BLOWER
°C
°F
*SPEED
RPM
OFR15000
15
51180
64
1/3
10” x 8”
(254 mm x 203 mm)
22
72
MEDIUM
903
OFR18000
18
61420
76
1/3
26
79
MEDIUM
903
OFR20000
20
68240
84
1/3
29
84
MEDIUM
903
OFR23000
22.5
76770
94
1/3
36
97
MEDIUM
903
10” x 8” (254 mm x 203 mm) BLOWER
SPEED
FLOW RATE
STATIC PRESSURE
(INCHES OF WATER COLUMN)
0.2
0.3
0.4
0.5
0.6
LOW**
CFM
L/s
684
323
582
275
535
252
481
227
429
202
MEDIUM
CFM
L/s
1149
542
1104
521
1064
502
1016
479
977
461
HIGH
CFM
L/s
1238
584
1203
568
1174
554
1139
538
1106
522
3
