AERCO Esteem O&M Manual - Manual (Page 50)

44
Set Boiler CH Set Point
 Measure Input - Natural Gas Only
1. Ensure the boiler is firing at maximum firing
rate. To manually place the boiler into high
fire mode, see page 49.
2. Operate the unit for approximately 10
minutes.
3. Turn off all gas appliances within the
building, except the Esteem 399 Low NOx
.
4. At the gas meter, record the time required
to use one cubic foot of gas.
5. Calculate Natural gas input using the fol-
lowing equation:
• 3600 x 1000 / number of second record-
ed for one cubic foot of gas = BTU/H.
6. The BTU/H calculated should approximate
the input rating listed on the unit.
Set Boiler CH Set Point
1. Press the MODE button until the display
shows PARA. This is the parameter mode
of the control.
2. Press the STEP button until the first
digit on the display shows “4”. The last
three digits on the display shows the
space heating Maximum Boiler Operating
Setpoint.
3. Press the “+” or “-” button to change the
setting.
N
OTICE
When an outdoor sensor is used, the set-
ting of Parameter 4 is the space heating
setpoint when the outdoor temperature is
at or below 0ºF. When the outdoor tem-
perature is above 0ºF, the Esteem 399
Low NOx control will calculate the boiler
setpoint between the minimum and max-
imum temperature settings.
4. Press the “STORE” button to save the set-
ting.
Operation Verifi cation - Space
Heating
N
OTICE
Digits and characters shown as [ 0000 ],
in the following outline, represent the
control panel display. The last three dig-
its on the display represent the meas-
ured boiler water temperature and may
differ from what is shown in the manual.
1. Disconnect the DHW (Domestic Hot
Water) thermostat wiring from the Esteem
399 Low NOx or turn down DHW tank
aquastat (if used) to ensure the boiler
does not receive a DHW call for heat.
2. Set the room thermostat to the lowest set-
ting.
3. Turn off power to the boiler, wait a few
seconds and turn on power to the boiler.
4. The following displays should occur:
• [ U1.22 ] Software version
• [
A140
] Self check on power up
• [
0140
] No call for heat
5. Initiate a call for heat by raising the set
point of the room thermostat to the highest
setting. The following display sequence
should occur.
• [ 5140 ] This is a fan / air flow check. The
burner blower will be energized momen-
tarily prior to the prepurge cycle.
• [ 1140 ] This is the prepurge cycle. The
burner blower and the space heating
circulator become energized. The blower
has a 10 second prepurge cycle.
• [
2140
] This is the ignition cycle. The
control module will energize and open
the gas valve and begin the spark for
ignition.
GF-125