Chapter 1: Safety Precautions
Prevent Roof Damage Due to Vacuum Pressure
• Roof damage can result from excessive vacuum or internal
pressure from fans or other air moving systems. The manu-
facturer does not warrant this type of roof damage.
• Adequate ventilation or “makeup air” devices must be pro-
vided for all powered air handling systems.
• The manufacturer does not recommend the use of down-
ward flow systems (suction).
• Severe roof damage can result from any blockage of air
passages.
• Operating fans during high humidity or cold weather condi-
tions can cause air exhaust or intake ports to freeze.
ST-0028–2
Maintain Equipment and Work Area
• Understand service procedures before doing work.
• Keep area clean and dry.
• Do not service equipment while it is operating. Disconnect
and lock-out power and fuel supply before entering equip-
ment or before performing maintenance.
• Keep your equipment in proper working condition. Replace
worn or broken parts immediately.
• Depressurize the fuel train before disassembling for service.
• Allow the fan to operate for 20 minutes with the burner off to
purge products of combustion and to cool the components
before entering.
• Check regularly for any developing gas plumbing leaks. Do
not operate the dryer if any gas leak is detected. Shut down
and repair before further operation.
ST-0030–2
Pneg–4900 TopDry Terminal™ 11
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