Procom ML060HPA - Manual (Page 9)

9
INSTALLATION
CONNECTING TO GAS SUPPLY
WARNING: A qualified
service person must connect
heater to gas supply. Follow all
local codes.
WARNING: This appliance
requires a 3/8
"
NPT (National Pipe
T h r e a d ) i n l e t c o n n e c t i o n
to the pressure regulator.
CAUTION: Never connect
heater directly to the propane/LP
supply. This heater requires an
external regulator (not supplied).
Install the external regulator be-
tween the heater and propane/LP
supply.
*A CSA/AGA design-certified equipment shutoff valve with 1/8
"
NPT tap is
an acceptable alternative to test gauge connection. Purchase the optional
C S A / A G A d e s i g n - c e r t i f i e d e q u i p m e n t s h u t o f f v a l v e f r o m
your dealer. See Accessories, page 17.
IMPORTANT: Install an equipment
shutoff valve in an accessible
location. The equipment shutoff
valve is for turning on or shutting
off the gas to the appliance.
Install sediment trap in supply line
as shown in Figure 13. Locate
sediment trap where it is within
r e a c h f o r c l e a n i n g . L o c a t e
sediment trap where trapped
matter is not likely to freeze. A
sediment trap traps moisture and
contaminants. This keeps them
from going into heater controls. If
sediment trap is not installed or is
i n s t a l l e d w r o n g , h e a t e r m a y
not run properly.
IMPORTANT: Hold pressure
r e g u l a t o r w i t h w r e n c h w h e n
connecting it to gas piping and/or
fittings.
CAUTION: Use pipe joint
sealant that is resistant to
liquid petroleum (LP) gas.
Figure 13 -Gas Connection
The installer must supply an
external regulator. The external
regulator will reduce incoming gas
p r e s s u r e . Yo u m u s t r e d u c e
incoming gas pressure to between
11 and 14 inches of water. If you
do not reduce incoming gas
pressure, heater regulator damage
c o u l d o c c u r . I n s t a l l e x t e r n a l
regulator with the vent pointing
down as shown in Figure 12.
Pointing the vent down protects it
from freezing rain or sleet.
Figure 12 - External Regulator with
Vent Pointing Down
CAUTION: Use only new, black
iron or steel pipe. Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of large enough
diameter to allow proper gas vol-
ume to heater. If pipe is too
small, undue loss of pressure
will occur.
Typical Inlet Pipe Diameters
All models up to 20,000 BTU’s use
3/8’’ or greater pipe;
All models 25,000 BTU’s and higher,
use 1/2” or greater pipe.
Installation must include an
equipment shutoff valve, union,
and plugged 1/8
"
NPT tap. Locate
NPT tap within reach for test gauge
hook up. NPT tap must be
upstream from heater (see Figure 13).
Apply pipe joint sealant lightly to
male threads. This will prevent
excess sealant from going into
pipe. Excess sealant in pipe could
result in clogged heater valves.