SECTION 19: D
IRECT
F
IRED
P
ROCESS
A
IR
H
EATERS
63
FIGURE 30: Burn Hazard
8.
The space ser
v
iced by the Process Heater,
d
u
ring the bake cycle mode m
u
st ha
v
e its light-
ing t
u
rned off. If not s
u
pplied by the process
heater, then the installer m
u
st electrically inter-
lock the facility lights
w
ith the bake cycle.
9.
Process Heaters in the baking cycle mode
req
u
ire a minim
u
m of 200 CFM of
v
entilation
air per 1000 CFH of f
u
el gas for proper com-
b
u
stion. If the Process Heater does not come
eq
u
ipped
w
ith the feat
u
res to meet this req
u
ire-
ment, then the installer m
u
st pro
v
ide the
method to accomplish it.
NOTE:
Process Heaters s
u
pplied by Rapid
Engineering LLC are a
v
ailable
w
ith the options
req
u
ired to satisfy this req
u
irement.
A. Red
u
ced Airflo
w
Process Heaters
• Variable Freq
u
ency Dri
v
e control of the Process
Heater's airflo
w
.
B. 90/10 Recirc
u
lation Process Heaters
• The installer m
u
st ens
u
re that the O
u
tside Air
Damper,
w
hen s
u
pplied by Rapid Engineering
LLC, is set to pro
v
ide proper airflo
w
for
comb
u
stion and to make s
u
re the recirc
u
lation air
is properly dil
u
ted d
u
ring the bake cycle mode.
This is accomplished by ens
u
ring the bypass
feat
u
re of the
v
entilating air damper is not blocked
by the installation or that the minim
u
m position
control of the
v
entilating air damper is f
u
nctioning
properly.
19.3 Installer's Responsibility for Process
Heaters Connected to Paint Booths
1.
If the exha
u
st control system is not s
u
pplied by
the Process Heater, then the installer m
u
st
electrically interlock the exha
u
st system
w
ith
the heater.
2.
If a p
u
rge cycle bet
w
een
v
entilation cycle mode
and the bake cycle mode is not s
u
pplied
w
ith
the Process Heater, then the installer m
u
st
s
u
pply a p
u
rge timer that delays the bake cycle
from operating for a minim
u
m of 3 min
u
tes or
at least 4 air changes of the space.
3.
The space ser
v
iced by the Process Heater,
d
u
ring the p
u
rging cycle and bake cycle mode
m
u
st ha
v
e all spray eq
u
ipment t
u
rned off. If not
s
u
pplied by the Process Heater, then the
installer m
u
st electrically interlock the spray
eq
u
ipment
w
ith the Process Heater.
WARNING
Burn Hazard
Allow equipment to cool before service.
Internal components of equipment may still
be hot after operation.
Failure to follow these instructions can result
in injury.
