GF
-
128
Innovation Series Water Heaters
Chapter 4
OMM-0079_0B
USER MANUAL
Initial Start-Up
Page
46
of
200
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph.: 800-526-0288
07/21/11
4.5.2
Minimum Load Adjustment
With the unit in operation, check the temperature control at minimum load as follows:
1. While monitoring the VALVE POSITION bar-graph, create a minimum load on the system that will yield
a steady valve position between 25% and 35%.
NOTE
It may be desirable to shut off the outlet valve and use the hose bib (see Figure 2-4) to
simulate a minimum flow load condition.
2. Wait several minutes to allow the outlet temperature to stabilize under load conditions.
3. Once stabilized, the
OUTLET TEMPERATURE
display should read no more than 2 to 3 degrees
above the unit’s setpoint.
4. If the outlet temperature is stabilized, proceed to the Maximum Load Adjustment procedure in
paragraph 4.5.3. If the temperature is not stabilized, proceed to step 5.
5. Press the
MENU
key and select the
Tuning Menu
.
6.
Press the ▲ or ▼ arrow key until
Min Load Adj
is displayed.
7. Press the
CHANGE
key. The display will begin to flash.
8.
Raise or lower the minimum load adjustment in increments of one or two using the ▲ or ▼ arrow key.
Increasing this value will increase outlet water temperature, while decreasing it will decrease outlet
water temperature.
9. Press
ENTER
to save the change. Allow time for the system to stabilize between adjustments
10. Repeat steps 5 through 9 as needed until the temperature is stabilized at no more than 2 to 3 degrees
above the unit’s setpoint.
4.5.3
Maximum Load Adjustment
Check the temperature control at maximum load as follows:
1. While monitoring the
VALVE POSITION
bar-graph, create a maximum load on the system that will
yield a steady valve position between 80% and 90%.
NOTE
It may be necessary to open the outlet valve if it was closed during minimum load
adjustment to obtain a sufficient flow rate for maximum adjustment.
2. Wait several minutes to allow the outlet water temperature to stabilize under load conditions.
3. Once stabilized, the
OUTLET TEMPERATURE
display should read no more than 2 to 3 degrees
below the unit’s setpoint.
4. If the outlet temperature is stabilized, no adjustment is necessary. If the temperature is not stabilized,
proceed to step 5.
5. Press the
MENU
key and select the
Tuning Menu.
6. Press the
▲ or ▼ arrow key until
Max Load Adj
is displayed.
7. Press the
CHANGE
key. The display will begin to flash.
8. Raise or lower the maximum load adjustment using the
▲ or ▼ arrow key. Increasing this value will
increase outlet water temperature, while decreasing it will decrease water temperature.
9. Press
ENTER
to save the change. Allow time for the system to stabilize between adjustments.
