Watts Aerco INN 1060N - Over-Temperature Limit Switches

Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 4 – INITIAL START-UP
OMM-0143_A • GF-216 • 9/6/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 66 of 170
Maximum Load Adjustment
yield a steady valve position between 80% and 90%.
4. Wait several minutes to allow the outlet water temperature to stabilize under load conditions.
5. Once stabilized, the outlet temperature displayed on the Controller should read no more than
2 to 3 °F (1.1 to 1.65 °C) below the unit’s setpoint.
6. If the outlet temperature is stabilized, no adjustment is necessary. If the temperature is not
stabilized, proceed to step 7.
7. Raise or lower Max Load Adj (increasing it will increase outlet water temperature), then allow
time for the system to stabilize.
8. Repeat step 7 as needed until the temperature is stabilized 2 to 3 °F (1.1 to 1.65 °C) below
the unit’s setpoint.
9. If the outlet temperature does not maintain setpoint after a reasonable amount of time and
adjustment, contact your local AERCO representative.
10. Set the Outlet Feedback parameter back to Yes.
4.6 OVER-TEMPERATURE LIMIT SWITCHES
The unit contains both Automatic Reset and Manual Reset Over-Temperature Limit switches,
shown in Figure 4.6. They can be accessed by opening the front panel door of the unit.
The Manual Reset Over-Temperature Limit switch is not adjustable and is permanently fixed at
190°F (87.7°C). This switch will shut down and lock out the unit if the water temperature exceeds
190°F (87.7°C). Following an over-temperature condition, it must be manually reset by pressing
the RESET button before the unit can be restarted.
The Automatic Reset Over-Temperature Limit switch is adjustable and allows the unit to
restart, once the temperature drops below its temperature setting. Set the Automatic Reset
Over-Temperature Limit switch to the desired setting.
Figure 4.6: Over-Temperature Limit Switch Location
MANUAL RESET
OVER-TEMPERATURE
LIMIT SWITCH
(NON-ADJUSTABLE)
AUTOMATIC RESET
OVER-TEMPERATURE
LIMIT SWITCH
(ADJUSTABLE)