User Guide
Document 485926
24 Baso Pilot with Micro
Quick Start Guide
Installation, Operation and
Maintenance Manual.
Direct Gas-Fired
Start-Up Video
Pre-Start Information: Locate wiring diagram on the inside of control center door
(eld-wired connections are indicated by dashed lines on diagram):
1. Enable the unit
a. Connect terminals R to G on unit terminal strip.
b. On initial power up, navigate to UNIT ENABLE and set the unit to ENABLED.
c. Verify blower rotation is correct. To reverse the rotation on three phase units,
disconnect and lock out power, then interchange any two power leads going to the
motor.
2. Determine Unit Airow Conguration -Constant volume (CV), Variable Volume (VAV),
Recirculating (RECIRC). Scan IOM QR code on document for further explanation of
airow congurations, if needed.
a. Navigate to the CTRL VARIABLES > ADVANCED> LOGIN and enter password 1000.
After pressing enter, this will return you to the Advanced menu.
b. Scroll down to the MANUAL OVERRIDES and press enter. Check enable overrides
box. Scroll down to supply fan and change to manual 100%, press enter.
c. Check motor amp draw and compare to motor nameplate FLA – reduce fan speed if
amp draw is greater than FLA.
3. Check burner pressure differential (Fig. 1)
a. Connect manometer to outer sensing probes (Fig. 1)
b. See Fig 2 for acceptable pressure differential for each gas type and unit conguration
c. Adjustment (if needed) - Test and balance should be completed prior to unit start-
up. If T&B has not been completed, fan speed should be adjusted to achieve
desired pressure differential. To increase pressure differential, increase fan speed. To
decrease differential, decrease fan speed. If pressure differential can’t be achieved
through fan speed adjustment, reference IOM for further setup instructions. (Scan QR
code on top).
4. Verify Inlet gas pressure
a. Inlet gas pressure needs to be equal to or greater than the “minimum for maximum
output”, but not to exceed the “maximum gas pressure” listed on the unit gas
pressure label.
5. Perform Heating Start-up
a. To enable the heating, navigate to the Ctrl Variables > Advanced > Manual Overrides
> DG Burner and set override to manual and command to on to enable heating.
b. LP only: Connect digital manometer to pilot test port. Zero manometer with fan
energized. Adjust pilot pressure to .5 in. wg.
c. Check pilot ame signal by closing main hand valve. Set meter to µA DC scale and
locate ame signal terminals on Baso ignition control. (Fig 3) Recommended ame
sense current of .1 – 1.0 µA DC
6. High/Low Fire Set-up
a. Locate gas label on exterior of unit and determine design temp rise.
b. High Fire - Increase DG Burner demand to 100%. Use outside air and supply air
temperatures shown on override menu to determine temperature rise (Temp Rise =
Supply Air – Outside Air). Adjust gas valve to achieve design temperature rise (Fig 4).
c. Minimum Fire – Set DG Burner demand to 0%. View burner ame through factory
sight glass. Adjust minimum ring rate (Fig 4) to achieve desired minimum
temperature rise while maintaining a small ribbon of continuous blue ame across the
burner. Typical setting = ¼ - ½ turn open.
d. Cycle the call for heat to make sure the burner can light at this low re setting.
7. Cycle unit power off and back on to remove any overrides.
Direct Gas Make-Up Air Quick Start Guide - 24 Baso Pilot with Micro
This quick start document is intended to help with getting the initial unit startup completed, but does not replace the IOM. Please
read the IOM for all safety information and precautions before performing any work on the equipment. Complete pre-start checks
and blower start-up prior to this procedure.
24 Baso Pilot with Micro Quick Start Guide, Rev. 1, September 2022
Fig. 3 BASO Ignition Control
Pressure Differential
NG LP
Constant Volume .6 - .7 .8 - .9
Variable Volume .5 - .8 .7- 1.0
Recirculation .5 - .8 .7 - 1.0
Fig. 2
(Values shown as in. wg)
Fig. 1 Measuring the Pressure Drop
Pressure Taps
Pressure Switch
Digital Manometer
Remove cap to
access maximum
firing rate adjustment
Minimum firing
rate adjustment
Pilot Pressure
Adjustment (LP)
Fig. 4 Separate Regulator
& Modulating Valves