Aerco SmartPlate User Manual download pdf (Page 28)

SmartPlate Installation, Operation & Maintenance Manual

CHAPTER 4 – ADJUSTMENT

Page 28 of 138 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0069_0E

PRI: 11/26/2013 Phone: 800-526-0288 SP-100

4.2.2 Manual Control of 3-Way Valve – Removable Handwheel to Hamper

Tampering

If desired, the control path (A-to-AB) of the Control Valve, (Siemens, MXG-461) can be opened

manually up to 95% of full-stroke. Refer to Figure 4-3 and proceed as follows:

1. Remove the water heater from service prior to using the manual operating mode.

2. Press the handwheel inward and rotate it clockwise to the MANUAL position. This will

disable the 0 to 10 VDC control signal from the ECS/SP Temperature Controller. The

Valve can now be mechanically rotated. The temperature control system is now disabled.

Be sure to return to the AUTO mode prior to returning the system to heating service use

(see step 4).

3. To disable automatic control of the Valve, press the handwheel inward and rotate it

counterclockwise to the OFF position. This will close the Valve.

4. To set the Valve for automatic (AUTO) operation, rotate the handwheel to the AUTO

position. The handwheel will pop up when in the AUTO position, thereby allowing it to be

controlled by the ECS/SP Temperature Controller.

AUTO

OFF

MANUAL

CCW

Push down

to rotate

Push down

to rotate

Figure 4-3. Control Valve Auto, Manual and Off Positions

The SmartPlate Electronic Control System (ECS/SP) is preset at the setpoint temperature

specified on the Sales Order. The over-temperature alarm limit is normally set 20°F above the

specified setpoint. If no setpoint or over-temperature alarm limit is specified, the ECS/SP will be

set to the Factory Default values of 140°F (setpoint) and 160°F (over-temperature alarm limit). If

changes are required, the setpoint and over-temperature alarm limits can be easily changed.

This is accomplished using the controls provided on the Temperature Controller and the Over-

Temperature Switch contained in the Control Box shown in Figure 4-4. These items can be

viewed through the window on the front door of the Control Box. To access these controls and

adjust the setpoint or over-temperature alarm limit, open the hinged Control Box door. Proceed

as indicated in paragraphs 4.3.1 or 4.3.2 to adjust the required parameters:

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 137 138

No comments

Aerco SmartPlate User Manual Page 28