80
Figure 15-1 Gas valve
D - Inlet gas pressure
probe
E - CO2 adjusting screw
F - Factory adjusted
regulator (Should never
be touched)
15.7 - Gas supply
pressure checking
WARNING!!!
DO NOT
adjust or attempt to measure
gas valve outlet pressure.
The
gas valve is factory-set for the
correct outlet pressure. This
setting is suitable for natural
gas and propane, requiring no
field adjustment. Attempting to
alter or measure the gas valve
outlet pressure could result
in damage to the gas valve,
causing excessive levels of
carbon monoxide, which can
cause severe personal injury or
death!
Check the gas supply pressure by
following the steps below:
1. close the manual gas shut-off
valve, Figure 14-1;
2. follow the steps in Section 17.2 to
remove the front cover;
3. turn the screw in pressure port “D”
shown in Figure 15-1 three turns
counterclockwise;
4. connect a manometer with
graduations of at least 0.1 in.W.C.
(0.25 mbar)
to the inlet gas port
“D” shown in Figure 15-1 (on unit
model 399 and 500, choose the
pressure port “D” from any gas
valve present).
5. open the manual gas shut off valve,
Figure 14-1;
6. check that the gas supply pressure
does not exceed 13 in.W.C. If the
gas supply pressure is higher than
13 in.W.C. adjust the upstream gas
pressure regulator to bring the gas
supply pressure between 12”WC
and 13”WC;
7. turn the power switch to on and
generate a heat demand by
pressing button
to its maximum
setting. Also ensure that the room
thermostat is calling for heat and
operate downstream the unit
to verifiy the system is able to
dissipate all heat generated.
8. set parameter
2200
to “
HIgH
”
(see section 16.11) (for boiler
model 199 use parameter
2010
).
All burners will now start to run at
high fire.
15 - START-UP
E
D
F
E
D
F
020010.01.022
9. check the manometer to make sure
the gas supply pressure does not
drop below 3 in.W.C. (7.6 mbar).
If the gas supply pressure is lower
than 3 in.W.C. means that your
inlet gas line or your gas pressure
regulator are not correctly sized;
CAUTION!!!
Do not attempt
to adjust your upstream gas
pressure regulator. This
was already adjusted for the
maximum inlet gas pressure.
After verifying the correct gas
pressures:
1. back to set parameter
2200
to
“
OFF
” (on models 199 back to set
parameter
2010
to “
OFF
”). Now
heater will back to work in normal
condition;
2. disconnect the manometer;
3. turn the screw in pressure
connection “D” in Figure 15-1,
clockwise until snug;
4. check pressure port “D” (Figure 15-
1) for any gas leaks;
CAUTION!!!
Never force the
pressure connection screw or
the gas valve will be damaged!
WARNING!!!
Never use an
open flame to check for gas
leaks, a fire or an explosion
could result causing severe
personal injury or death!
5. close the manual gas shut-off
valve, Figure 14-1.
Summary of Contents for Esteem 399
Page 3: ...3 SAFETY INSTRUCTIONS ...
Page 5: ...5 SAFETY INSTRUCTIONS ...
Page 112: ...112 17 MAINTENANCE ...
Page 116: ...116 19 SPARE PARTS Spare parts ...
Page 135: ......
