Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 66)

© The Fulton Companies 2014
MAINTENANCE
HPN-IOM-2014-0416
SECTION 4
4-6
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
4
CAUTION
All maintenance procedures should
be completed by trained personnel.
Appropriate training and instructions
are available from the Fulton Service
Department.
FIGURE 19 - STACK LIMIT SWITCH
 Soot Cleaning
If your coil inspection indicates severe sooting, the following procedure should
be followed:
1. Make sure the heater is off and fl uid is ambient temperature.
2. Remove the burner and lower access doors.
3. Wire brush coils and use compressed air where accessible.
4. Vacuum loose soot where accessible.
5. Reinstall the burner and lower access doors.
6. Fire the heater and set combustion.
Safety Check Procedures
Perform the following safety checks as needed:
 Liquid Level Switch
Manually turn liquid level switch cam counterclockwise. See Figure 10. Micro-
switch will open contacts and control voltage will be lost. Release cam and
micro-switch will make and control voltage will be restored.
 Stack Limit
The limit manufacturer presets the stack limit. Testing can be performed by
removing switch from stack and applying heat over that of the switch set point
for several seconds. The switch can then be reset and re-installed. See Figure 19.