Type 300HT Series
Electrode Stabilization Ovens
Operating Instructions
Operating Instructions
2
Phoenix International 8711 West Port Avenue Milwaukee, WI 53224 +1 414.973.3400 [email protected]
dryrod.com
Product Description
Wiring
Check type and voltage on nameplate.
Type 300HT (120/240V AC only) single phase shipped at 1/240V wiring
Note: Type 300HT Series ovens are wired at the factory for 240 volts. For 120 volt
use, add heating element jumper connection. Rewire heating element connections
per the 120 volt wiring diagram. Provide a plug cap of the corresponding voltage
rating for connection to the power supply. Refer to wiring diagrams.
Grounding
The 300HT Series ovens have a 10 foot power supply cord. For 120 volt use, attach a
15 Amp 120 volt plug to the cord. Rewire according to 120 volt wiring diagram.
Amp Draw
Ovens operating on 120 AC voltage draw 12.5 amps. Those operating on 240 AC
voltage draw 6.3 amps.
Accessory Note
A Door Mounted Thermometer
(part #1250300) is available for
Type 300HT Series ovens and can
be easily installed in the field.
Factory installation is available with
original order (see chart on cover).
This thermometer indicates internal
temperature range of 100° to 700°F
with an accuracy specification of
+/-10°. Product accuracy testing
is conducted using standards
traceable to the N.I.S.T., USA.
Accessory Note
Stacking provision for Type 300HT
ovens is available with original
order. Stacking permits two Type
300HT ovens to occupy the same
floor space as one. For each stack,
only ONE oven needs to be ordered
with the stacking lugs. Stacking lugs
(factory installed only) on lower
oven bolt to feet of any Type 300HT
oven, whether in the field or newly
ordered.
Electrode Placement
DryRod ovens have divided shelves to allow storage of more than one group of
electrodes. It is recommended to store different electrodes in separate ovens to
avoid contamination. Spread the electrodes evenly, allowing space over each shelf
for air circulation required to remove excess moisture. The maximum suggested
layer depth on any shelf is 5 inches.
Temperature Settings
Type 300HT Series oven temperature range is 120°F (50°C) to 660°F (350°C). The
thermostat dial (at rear of oven) is calibrated at 120°F (50°C) to 660°F (350°C).
Required oven temperature setting is obtained by rotation of thermostat dial to line
up desired temperature with indicator light in the thermostat housing.
The indicator light illuminates only when voltage is being applied to the heating
elements. Momentary rotation past desired temperature setting may be necessary
to activate the indicator light in order to locate it for indexing purposes.
Thermostat is accurate to +/-25°F (14°C) at the sensing bulb; however, temperature
may vary slightly at different areas in the oven chamber as this is a convection type
oven. For applications requiring higher temperature, an electrode rebaking oven is
required. (We suggest Phoenix Type 40HT High Temperature Oven.)
At the maximum setting, the actual temperature in portions of the oven near the
heating elements may reach approximately 700°F (371°C).
Temperatures over 660°F (350°C) are not recommended. They may cause oven
damage and/or unacceptably high exterior surface temperatures.
Venting
Before placing the oven into service, run the oven at 550°F (255°C) for two hours
with vent hole fully open. This will help to purge the oven of any contaminants.
(Smoke exiting from vent hole is common during burn-off of contaminants.)
For normal holding operation, set easily adjustable vent on the door about ¼ of the
way open. For replacement vents, see Replacement Parts section in this manual.
Guide to Storage
Electrodes should be stored according to electrode supplier recommendations.
In the absence of storage information from your electrode manufacturer, please
reference Phoenix's Guide To Electrode and Flux Stabilization for approximate
temperatures, found at
CAUTION
•
To provide continued protection against risk of electrical shock, power
cord must be connected to a properly grounded outlet.
•
To avoid damage, never place oven in contact with welding current.
•
Store in dry location. Unit not to be exposed to rain or moisture.
Stacking lugs
Door mounted thermometer
