Product Manual

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 deenergized.
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 deenergized.
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 tempera-
ture 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 deenergized 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 deenergized.
The accessory unit mounted stratification thermostat will
energize the unit heater fan motor upon a rise in
temperature above its setting.
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 deenergize the
heating elements and control circuits should the temperature
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 accessory 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 accessory 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
deenergized. When switch is placed in the FAN position,
elements shall be deenergized and fan shall be immedi-
ately energized.
Optional diffusers lend added air pattern versatility to
individual vertical down blow installations as shown in
above illustations.
3
USED MAX A B STOCK MAX A MAX A STOCK STOCK MAX MTG HT. A
ON MTG NO. MTG MTG NO. NO.
HT. HT. HT. 45
O
OPEN 45
O
OPEN
55 THRU 75 KW -- -- -- STD -- -- -- -- AD5175 RD 5175 -- -- -- --
80 THRU 100 kW -- -- -- STD -- -- -- -- N/A N/A -- -- -- --
STD = Standard N/A = Not Applicable
VERTICAL DISCHARGE UNITS - AIR PATTERNS
TABLE 1
Louver Diffuser (Standard)
General Distribution
(No Diffuser)
Anemostat Diffuser
(Optional l)
Radial Diffuser (Optional)
55 thru 75kW only 55 thru 75kW only