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PRINCIPLES OF OPERATION
Upon a call for heat from the floor level or unit mounted
optional accessory thermostat, the unit fan motor and
heating elements shall be energized and remain ON until
temperature reaches setting of thermostat; at which time
the heating elements shall be de-energized.
The fan motor shall continue to run and purge heater
casing of residual heat until setting of fan override is
reached, then the fan motor shall be de-energized.
All units are supplied with a single speed motor .The 55-75
kW heaters are supplied with 3 stages of heat. The heater
can be wired as one stage, two stage or three stage. The
80 thru 100 kW models are supplied with four stages and
be operated as 1 thru 4 stages.The thermostat or step
controller(optional) will, upon a call for heat, energize fan
motor and the first stage heating element. Should tem-
perature continue to fall, the thermostat shall energize the
remaining stages according to demand.
Upon a rise in space conditions towards setting of the
thermostat or step controller, the stages of heating ele-
ments shall be de-energized in reverse sequence.
The fan motor shall continue to run and purge heater
casing of residual heat until setting of fan override is
reached, then the fan motor shall be de-energized.
The optional unit mounted stratification thermostat will
energize the unit heater fan motor upon a rise in
temperature above its setting.
VERTICAL DISCHARGE UNITS - AIR PATTERNS
Louver Diffuser (Standard)
TABLE 1
USED
MAX
A
ON
MTG
HT.
55 THRU 75 KW
31' 109' 60'
80 THRU 100 kW 40' 140' 80'
STD = Standard
N/A = Not Available
FORM: 8986
ECO 1-6931
General Distribution
(No Diffuser)
B
STOCK
MAX
A
NO.
MTG
HT.
STD
31'
83'
STD
40'
100'
When the unit mounted stratification thermostat closes on a
temperature rise and at the same time the floor thermostat
calls for heat, the motor shall be energized immediately and
the heating element shall be energized, as previously
described.
The manual reset safety high limit shall de-energize the
heating elements and control circuits should the tempera-
ture exceed the setting of this device. The fan safety
override shall energize fan motor any time the setting of this
device is exceeded so as to purge heater casing of excess
residual heat.
When the optional fan switch is placed in the ON position
(for summer air circulation), the unit heater fan motor shall
be energized.
NOTE: The wall thermostat is to be set to the OFF position
during this mode of operation (units with contactors).
For those optional thermostats equipped with an integral fan
switch, place the switch in the HEAT, or AUTO position for
operation of the fan and elements which shall then be under
control of the thermostat as described above.
When switch is placed in the OFF position, the unit shall be
de-energized. When switch is placed in the FAN position,
elements shall be de-energized and fan shall be immedi-
ately energized.
Anemostat Diffuser
(Optional l)
55 thru 75kW only
MAX
A
STOCK
MTG
NO.
HT.
31'
90'
AD5175
N/A
N/A
N/A
Optional diffusers lend added air pattern versatility to
individual vertical down blow installations as shown in above
illustations.
Radial Diffuser (Optional)
55 thru 75kW only
STOCK
MAX MTG HT.
NO.
45
OPEN
O
RD 5175
23'
42'
N/A
N/A
N/A
A
45
OPEN
O
80'
60'
N/A
N/A
4
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