Chapter 4
Innovation Series Water Heaters
GF-128
Initial Start-Up
USER MANUAL
OMM-0079_0B
07/21/11 AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
Page
45
of
200
4.4
REASSEMBLY
Once the combustion calibration adjustments are properly set, the unit can be reassembled for service
operation.
1. Set the
ON/OFF
switch in the
OFF
position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings and reinstall the NPT plug using a suitable pipe thread
compound.
5. Remove the combustion analyzer probe from the 1/8” vent hole in the exhaust manifold. Replace the
1/8” NPT plug in the manifold.
6. Replace the unit’s side panels and front door.
4.5
TEMPERATURE CONTROL CALIBRATION
Although the unit comes factory set and calibrated for a 130
°
F setpoint it is usually necessary to recalibrate
temperature control. There are two primary adjustments for performing temperature calibration. These are
Min Load Adj
and
Max Load Adj
(minimum and maximum load adjustment).
Adjustments to these settings are made at minimum and maximum load conditions and should be made in
small increments from 1 to 3 degrees. After making an adjustment, the outlet water temperature must be
allowed to settle for several minutes prior to making any further adjustments.
When calibrating temperature control, observe the following:
1. The unit must be in the Auto mode of operation.
2. The
Outlet Feedback
option in the
Tuning
Menu must be set to OFF while performing calibration.
3. Monitor the
OUTLET TEMPERATURE
display and
VALVE POSITION
bar-graph to set load
conditions and observe the effect of adjustments.
4. Perform the calibration using the Tuning Menu of the C-More Control Box.
5. Make small adjustments and allow time between adjustments for the outlet water temperature to
stabilize.
6. Maintain water flow as constant as possible during these adjustments.
7. Ensure that recirculation loops are operational while the calibration is being performed.
4.5.1
Setting the Outlet Water Temperature Setpoint
The setpoint temperature of the unit may be changed by following the procedure below. However, once a
setpoint has been changed, recalibration may be necessary. The temperature calibration procedures are
provided in paragraphs 4.5.2 and 4.5.3.
To adjust the unit’s setpoint, proceed as follows:
1. Press the
MENU
key until
Configuration
Menu
is displayed.
2. Press the
▲ or ▼ arrow key until
Internal Setpt
is displayed along with the present setpoint
temperature.
3. To change the setpoint, press the
CHANGE
key. The display will begin to flash.
4. Press the
▲ or ▼ arrow key until the desired setpoint is displayed.
5. Press the
ENTER
key to save the change.
