gas tube for tightness and good
connection. Make sure that the air flow
sensor tube is tight and well connected.
4. Perform gas pressure test at test port
on inlet manual gas valve and assure that
the maximum pressure listed on the unit
information tag is not exceeded. In
addition, check that there is enough gas
pressure and capacity for burner size.
5. Check all gas lines and gas manifold
for leaks.
6. Double check all electrical
connections to the unit.
Start Up
1. Bump start the motors and check for
proper rotation. Correct rotation if
necessary.
2. Connect amp probe to motor circuits
and turn unit on. Document amperages
for each power leg and date. Assure that
motors are within their motor plate
amperage ratings. Leave documentation
in the control panel and send copy with
warranty information to manufacturer.
3. Install gas pressure gauges on the on
manual gas valves of the gas train. After
unit is up and running, turn burner on.
While waiting for gas train safety to
complete it’s cycle, turn burner manifold
manual gas valve off. When ignition
sequence has completed and pilot flame
is present, use the pilot orifice on the gas
manifold to adjust the pilot flame to
approximately four (4) inches in height,
or the size of a fist. If a freeze thermostat
is install for extremely cold climates,
( below -20 deg. F. ) the burner will not
start if the temperature across the burner
is below –20 deg. F.
4. Adjust high fire setting by viewing
gas meter at the test port on the burner
manifold manual gas valve.
Set the temperature controller on the
remote control panel to the manual
setting and set output to 100 %. Open
the burner manifold manual gas valve
long enough to acquire reading and close
the valve. The pressure should be 4.2”
WC minimum and should not exceed
5.2” WC maximum. Adjust regulator if
necessary and test again. Set temperature
controller back to 0.0 % output and open
output manual gas valve.
5. Adjust the burner ribbon with the
temperature control in the manual setting
and set to 0.0 % output. Viewing the
burner, adjust the zero increase
potentiometer in the top of the gas
manifold modulating motor. Adjust the
zero increase until a small flame is
ribboning across the bottom of the
burner trough. When adjustment is
correct, set temperature control back to
the auto setting. Increase and decrease
the temperature setting on the
temperature control to check for proper
operation.
6. Set the bake timer to 5 minutes. On
99270 model push the SPRAY and the
BAKE switches. On the 99273 and
99275 units set the OFF/SPRAY/BAKE
switch to the BAKE position. Wait for
change over to occur. After 3 minutes
the dampers should change over to
recycle. When the bake timer times out,
the cool down cycle will begin. The
entire unit should shut down after the
cool down cycle is complete.
7. Test air through- put and change
sheaves if necessary.
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Summary of Contents for 99270
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