Emerson SMMC-3 manual Time Delay Zone 1 min.0 2.0H Max.10, Outside T=-3C A1-A2-A3-P1-P2-P3-M1

ZONE ASSIGNMENT

The SMMC-3 uses the concept of a zone system to most efficiently control snow/ice melting equipment. The term “zone” means an area (either surface area or roof/gutter area, or some combination of both) heated by a specific set of snow/ice melting equipment that is controlled in a common manner. The SMMC-3 allows for up to three zones, and each zone can have multiple moisture sensors for, say, roof/gutter, aerial and/or surface snow/ice detection. If any one of the sensors detects moisture, the heating equipment may be energized. The moisture sensor in the zone should be generally, surrounded by the heating equipment to ensure that the heating equipment is only energized when there is snow/ice present in the zone. Zones can be used to represent different areas; for example a parking ramp area could be one zone while roof/gutter de-icing on the same building could be another zone. Similarly, two sidewalks on different sides of the same building (possibly one on the north side and one on the south side) could represent two separate zones. The perimeter of a football stadium could be split into three separate zones to reflect different weather conditions on different sides of the building.

To de-energize the manually activated heating equipment, use the toggle switch on the front panel.

When operating in Mode 2 – Priority, the manual override works as described if no snow melting zones are energized. If any snow-melting zone is energized the manual override only works to energize the higher priority zone, thereby de-energizing the lower priority zone.

It is important to note that manual operation is not possible if the SMMC-3 has already energized the zone, and that manual control will be overridden if the zone moisture sensor detects precipitation.

LCD Explanation

	Temperature
Temperature	Value & Units
at SMTS-1 location	°C or °F

Outside T=-3°C

A1-A2-A3-P1-P2-P3-M1

MANUAL OPERATION

The power to any one of the snow-melting zones may be activated manually by pressing and holding the ZONE X button until the information below appears on the LCD screen. Manual activation will only work a long as the ambient temperature is below the SMMC-3 shut-off temperature. The duration of the time the zone will remain energized (Time Delay) is pre-set to 2.0 hours; this can be adjusted by following the programming instructions below. The minimum and maximum settings possible are noted on the LCD, adjustable in 0.5 hour increments.

M. Time Delay Zone 1 min.0 <2.0H> Max.10

Pressing UP increases the delay time. Pressing DOWN decreases the delay time.

Press the SET button to accept the chosen delay time.

Once the delay time is set, the SMMC-3 returns to normal control function, and energizes the heating equipment for the selected zone.

(only sensors activated will show)	M1= Mode 1 Independent
A1=SMAS-1 or SMGS-1 ZONE 1	M2= Mode 2 Priority

A2=SMAS-1 or SMGS-1 ZONE 2

A3=SMAS-1 or SMGS-1 ZONE 3

(only sensors activated will show)

P1=SMPS-1 ZONE 1

P2=SMPS-1 ZONE 2

P3=SMPS-1 ZONE 3

PO. Box 726 n TULSA, OK 74101 n TEL 918-627-5530 n FAX 918-641-7336 n www.nelsonheaters.com

GA-2318, R1

Sheet 8 of 15

May 2008