Holman qt14 User Manual
Page 2
Common Questions, Myths, and Misconceptions
of Holman Conveyor Ovens
Misconception:
High Voltage (208v typical) is always the same.
Reality:
An oven designed for 208v should operate from 208-215v. This range is
typical of local power grids and daily fluctuations. Some municipalities
operate at 220 and 240v which would require design variations. Improper
voltage can result in reduced control, performance, and reliability. Voltage
mismatches or daily fluctuations can be monitored for corrective action.
Misconception:
The under-carriage of your oven is a safe haven for paper wraps and utensils.
Reality:
The high-speed fan is the lungs of your oven. The oven has under-clearance
to maximize fan performance, cooling, safety, and reliability. Please
maximize the air-circulation to your fan and clean the debris on fan-grill
often. Note: Beware of paper and plastic wraps being drawn into fan-grill.
Misconception:
Vent hoods can be hard-wired into the oven or to the same wall circuit.
Reality:
Your conveyor oven can not support the current draw of the oven and a hood.
This practice will decrease performance and reliability as well as jeopardize
the Underwriter Laboratory’s safety certification. Please have a qualified
electrician wire your vent hood to a separate circuit.
Misconception:
My conveyor oven is maintenance-free.
Reality:
Proactive or preventive maintenance (PM) is the best way to protect against a
catastrophic failure (Murphy’s Law states: components will fail at peak
sandwich time). Maintenance provisions include heater-tubes, fan, chain,
belt, incoming power, lubrication, working and aesthetic surfaces, overall
cleanliness, and ventilation. Refer to weekly, monthly, and long-term
maintenance manuals for step-by-step instruction. Owning an emergency
repair kit is also recommended.
Misconception:
My heater-tubes will last forever.
Reality:
Your infra-red radiant style heating elements use a quartz sheath. They are
extremely effective and efficient in the bake, as well as producing quick rise-
time from cold start to full bake. However, just like a light bulb, quartz is
brittle and can break from jarring or careless maintenance. Long term
degradation of quartz also occurs from air borne sugars, salts, and debris
settling on the sheath. For consistent performance replace your tubes at
prescribed intervals.
“It’s what you learn after you know it all that counts.” -John Wooden