Guspro BB-8416884 - 7.0 - OVER TEMPERATURE SUPPRESSION SYSTEM; 7.1 Introduction; 7.2 Operation

2017_E_TYPE-HL.doc Page 44 of 55 24-Oct-2017
7.0 - OVER TEMPERATURE SUPPRESSION SYSTEM
7.1 Introduction
The OTS (Over Temperature Suppression) system injects a fine, cone-shaped water mist
spray to handle virtually any over-temperature condition or ignition inside the heat-cleaning
oven. Since the spray nozzles are made of stainless steel, they tend to gall and bind from the
high temperature inside the oven. This can make it difficult to unscrew the nozzle cap so the
assembly can be cleaned.
The oven should not be operated if the nozzles do not spray properly. It is recommended
that a new, complete, spare set of water spray nozzles be kept in inventory at all times.
7.2 Operation
The Over Temperature Suppression System is a backup safety system. Its purpose is fast
suppression of excess temperature caused by excessive volatilisation of the product being
processed in the oven. This may occur if the oven has been overloaded with parts coated with an
extremely volatile coating.
The OTS is operated full open at 40-45 PSI, as this provides the fast suppression desired.
On extreme loads, such as heavily coated stators and heavy paint loads, the OTS control should
be set a maximum of 25
0
F over the set point. It is important to set the OTS properly as excess
water could pressurize the oven process chamber. This may cause:
• Incomplete heat cleaning of parts
• Smoke emissions from the chamber.
Should either of the above conditions occur, adjustments must be made. The OTS system
should be checked for defective nozzles. In some cases, the oven processing control sequence
may need to be modified.
When the OTS system is activated, the OTS sprays water until the process temperature
drops to the OTS set point. In turn, the burner activates when the temperature drops to the
process chamber set point.
The oxidizer chamber water spray control system is normally set to activate at
100
0
F above the oxidizer set point temperature. This corresponds to the Alarm 1 setting of the
Oxidizer temperature controller. When this limit is reached, a relay is activated.