– 30 –
SECTION X - MANIFOLD AND VALVE ADJUSTMENTS
The I/O Zone 583 Controller
(UC-01) must be calling for the
burner to be enabled. The
DO-2 light will be on and Burner
Enable Relay (RE-28) needs to
be energized. This will put power
to the Burner Relay (RE-02).
If
the outside air temperature is
above the Heating Economizer
65°F Setpoint the burner will
be disabled.
You will need to
disconnect the plug where the
Outside Air Temperature Sensor
(TS-01) and Discharge Air
Temperature Sensor (TS-03)
are wired to the I/O Zone 583
Controller (UC-01), see High
Fire and Low Fire Adjustment
in following section. Reconnect
the plug if you are getting close
to the Freezestat lockout time,
approximately 3 minutes. To reset
the Freezestat alarm simply turn
the power off and back on at the
disconnect switch.
NOTE: A BACview or PC is
required to change settings.
See the Digital Control System
User Manual for a more detailed
sequence of operation.
Prior to setting high and low
fi
re you should have your test
equipment installed and be familiar
with the gas valve (VG-07) and
its adjustment, see High Fire and
Low Fire Adjustment in following
section. For High Fire Setpoint
refer to rating plate on unit for
Normal Manifold Pressure in
inches of water column. The typical
high
fi
re
fl
ame should be blue and
approximately 12 to 18 inches long
with short orange to yellow tips.
After high
fi
re has been set, low
fi
re may need to be re-adjusted.
Cycle the burner several times to
be sure it lights off reliably. Low
fi
re
is a visual setting.
CAUTION: There should be a con-
tinuous flame along the entire
burner length without any blow-
out spots.
HIGH AND LOW FIRE MANIFOLD ADJUSTMENT
FOR MAXITROL VALVES WITH DDC
(MR212)
High Fire Manifold Adjustments
Note: Low
fi
re may need to be set
fi
rst to get the burner to light off
properly.
1. Disconnect the plug where the
Temperature Sensors (TS-01
and TS-03) are wired to the
unit control module (UC-01). A
minimum of 15vdc is required at
terminals #5 and #6 on electric
relay (RE-26). This causes the
valve to call for continuous high
fi
re.
Caution: The unit will
shut down on freezestat after
approximately 3 minutes.
2. Remove seal cap (A) and turn
regulator pressure adjusting
screw to obtain normal
manifold pressure (clockwise
rotation increases pressure).
Low Fire or Bypass Adjustments
1. Disconnect wire from (RE-26)
terminal #8. This causes valve
to call for continuous low
fi
re.
2. Remove cap (B) and loosen
lock screw (C). Turn (D) to
desired low
fi
re adjustment.
(Clockwise rotation reduces
minimum
fl
ow rate.)
3. Tighten screw (C), replace cap
(B), and reconnect wire to
(RE-26) terminal #8.
4. Reconnect the plug back into
the jack on the unit control
module (UC-01).
(M611)
High Fire Manifold Adjustments
Note: Low
fi
re may need to be set
fi
rst to get the burner to light off
properly.
1. Disconnect the plug where the
Temperature Sensors (TS-01
and TS-03) are wired to the
unit control module (UC-01). A
minimum of 15vdc is required at
terminals #5 and #6 on electric
relay (RE-26). This causes the
valve to call for continuous high
fi
re.
Caution: The unit will
shutdown on freezestat after
approximately 3 minutes.
2. Adjust the gas pressure
regulator (GP-05) to obtain the
normal manifold pressure.
Low Fire or Bypass Adjustments
1. Disconnect wire from (RE-26)
terminal #8. This causes valve
to call for continuous low
fi
re.
2. Remove cap (A) and turn
adjusting screw (B) to desired
low
fi
re adjustment. (Clockwise
rotation reduces minimum
fl
ow
rate.)
3. Replace cap (A) and reconnect
wire to (RE-26) terminal #8.
4. Reconnect the plug back into
the jack on the unit control
module (UC-01).
M611
MR212
