43
Field Installed Accessories
Units with transformers must have a contactor. A control transformer with 120V secondary is available on all 3-phase
models, 208V/240V 1-phase units up to 3KW, and up to 4 KW on 277V. All heaters must be installed with a wall box.
shall be heavy-duty, hydraulic type with a range of 40°F to 80°F and with remote sensing bulb placed
in the return air. Thermostats shall be electrically rated at least 125% of heater rating. Thermostats
shall also act as a disconnect by breaking all ungrounded conductors in the OFF position. (Thermostat
control knob shall be covered by a 16 gauge tamper-proof access plate to prevent adjustment by
unauthorized personnel.)
CONTACTORS:
Where required, heaters shall be equipped with heavy-duty, definite purpose contactors with flame
path separators and dust covers. Contactors shall cycle all ungrounded conductors. Contactors shall
have holding coils (of the same voltage as the heater) or (120 Volts) or (24 Volts).
CONTROL TRANSFORMERS:
Heater shall be equipped with a Class 2 control transformer, sealed rating of 20 VA, to supply
control circuits of (24 Volts) or (120 Volts). (120 Volt secondaries not available in single phase
heaters over 3 KW).
CIRCUIT BREAKERS (3450 Series Only):
Heaters shall be equipped with built-in circuit breakers in order to allow the heaters to be supplied
from feeder taps. A separate switch providing a positive off for control circuits shall be included
where required. Circuit breakers and control switches shall be arranged so that all line side conductors
will be separately enclosed when heater front is removed for servicing so that no current carrying
parts are accessible without the use of additional tools.
Product Specifications
MODEL
DESCRIPTION
SERIES OPTIONS
3420
3450
Suffix - R
Contactor with Coil same as heater
YES
YES
Suffix - R1
Contactor with 24V Coil
YES
YES
Suffix - R2
Contactor with 120V Coil
YES
YES
Suffix - C
Circuit Breakers - all models
NO
YES
Suffix - A1
Control Transformers With 24V Secondary
NO
YES
Suffix - A2
Control Transformers With 120V Secondary
NO
YES
UPC#
686334
MODEL
DESCRIPTION
WT.
691949
3450EX34
4” Surface Mounting Sleeve
6 lb.
691932
3450EX16
2” Semi-Recessing Sleeve
4 lb.
691925
3450EX8
1” Semi-Recessing Sleeve
4 lb.
691604
3420EX34
4” Surface Mounting Sleeve
5 lb.
691598
3420EX16
2” Semi-Recessing Sleeve
4 lb.
691581
3420EX8
1” Semi-Recessing Sleeve
3 lb.
3420 & 3450 Series Heavy-Duty Fan Forced Wall Heaters
