24
Page
-Measuring inlet gas pressure-
The micro-boiler cannot perform properly without su
fficie
nt inlet gas pressure. Below are ins
tructions
on
how to check the inlet gas pressure.
THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL
.
WATER CONNECTIONS
All pipes, pipe
fittings,
valves and other components, including soldering materials, must be suitable for
distilled water or distilled water-glycol mix.
1.
A manual shuto
ff
valve must be installed on the cold water inlet to the micro-boiler between the main
water supply line and the micro-boiler.
2.
In
addition,
a manual shuto
ff
valve is also recommended on the hot water outlet of the unit. If the
micro-boiler is installed within, or subjected to, a closed loop system (Recommended), a thermal
expansion tank mu
st be installed.
1. Turn o
ff
all electric power to the micro-boiler if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit clockwise to the
o
ff
position.
•
Do not use this micro-boiler if any part has been submersed under water.
Immediately call a licensed professional to inspect the micro-boiler to replace
any damaged parts.
•
micro-boiler.
e
h
t
o
t
s
n
o
it
c
e
n
n
o
c
t
e
l
n
i
d
l
o
c
d
n
a
t
e
lt
u
o
t
o
h
e
h
t
e
s
r
e
v
e
r
t
o
n
o
D
This will not properly
acti
vate the micro-boiler.
CAUTION
1. Shut o
ff
the manual gas valve on the gas supply line.
2. Remove the screw for the pressure port located on the
gas inlet of the micro-boiler shown in the diagram on
the right.
3. Connect the manometer to the pressure port.
4. Re-open the manual gas valve.
Check to see that there
are no gas leaks. Open some of the
fix
tures that use the
highest
fl
ow rate to turn on the micro-boiler.
5. Check the inlet gas pressure. When the micro-boiler
is on ma
ximu
m and minimum burn, the manometer
should read from 5.0” to 10.5” W.C. (1.24 to 2.61 kPa) for
Natural gas, from 8.0” to 14.0” W.C. (1.99 to 3.48 kPa) for
Propane.
3.
Before installing the micro-boiler,
flush
the water line to remove all debris, and
a
ft
er installa
tion
is complete, purge
the air from the line. Failure to do so
may cause damage to the boiler.
4.
There is a wire mesh
fil
ter within
the cold inlet to trap debris from
entering your boiler. This will need
to be cleaned periodically to maintain
op
timum
fl
ow. (Refer to p. 44.)
Cold
inlet
Hot
outlet
Gas inlet
As Close as
Possible
Pressure relief valve
Pressure port
