80
Start-Up Procedure Heating
Furnace Start-Up Summary
1. Open the field-installed manual gas shut-off valve and ensure the On/Off gas control valve knob is set
to ‘On.’
2. Check inlets to all firing tubes on the furnace and ensure that they are all clear of foreign debris. Verify
that the tubes line up properly with each nozzle of the gas manifold.
3. Start the unit and check the gas supply pressure at the inlet gas gauge, this gauge is upstream of all
electronic gas valves. The inlet pressure should be
7 in. - 14 in. wc on natural gas or 11 in. – 14 in.
wc on propane gas
. If the inlet pressure is too high, install an additional pressure regulator external to
the unit.
4. Verify DIP switches are set correctly on the modulating valve (
). Factory setting for DIP
for DIP switch settings.
5. A final gas leak check shall be performed to verify the gas-tightness of the heater’s components and
piping under normal operating conditions.
6. At any point during high/low fire burner adjustment, check the characteristics of the flames in every
firing tube of the furnace. Non-existence of flame or a lazy flame can be caused by no gas pressure,
low gas pressure, a dirty nozzle orifice, or clogged section of exhaust flue.
7. When testing has completed, replace all caps and covers removed during the adjustment procedure.
High Fire Burner Adjustment
1. Set the unit into high fire mode. This is achieved by configuring high fire by going into the HMI’s
configuration, refer to
“Accessing Configuration” on page 46
. Go to:
Service > Test Menu > Test
Gas Heat > Run High Fire Test
.
2. After it has been verified that the furnace(s) are lighting off properly, the manifold gas pressure should
be adjusted to jobsite conditions. The gas pressure regulator (integral to the On/Off gas control valve,
) is adjusted at the factory for average gas conditions. The gas supplied to the
furnace must be in accordance with the input rating on the rating plate. Once the gas pressure is
verified, continue to step 3.
3. If the unit is set up for analog control, continue with high fire using the method above or send the unit a
constant 10V DC or 20mA signal. Refer to
.
- Remove the cover on the modulating valve (
). Read the manifold gas pressure gauge
(0-10 in. wc) located directly on the gas manifold. The pressure should read
3.5 in. wc
for natural
gas /
10 in. wc
for propane.
If the pressure is incorrect, adjust the pressure.
- To adjust the pressure, press button #1 until the LED lights solid red. Release the button. The valve
is now in high fire setting mode.
- Buttons #1 and #2 are used to set high fire setting. Press once to step or hold to auto step.
4. If the proper (
in. wc
) gas pressure cannot be achieved by adjusting the modulating gas valve, and it
has been verified that the inlet gas pressure is within the acceptable range of
7 in. - 14 in. wc on
natural gas and 11 in. – 14 in. wc on propane gas
, adjust the regulator on the On/Off gas control
valve. Use a screwdriver to
turn the inner adjustment screw clockwise to increase the gas
pressure, Figure 13.
Table 14 - Modulating Valve Dip Switch Settings
Control Signal
SW1 Signal
SW2 Offset
SW3 Characteristic
0-10 V
OFF
OFF
OFF
2-10 V
OFF
ON
OFF
0-2 mA
ON
OFF
OFF
4-20 mA
ON
ON
OFF
