Scg2000, Space Heating Only - Slant/Fin Caravan LDWO-1100-3-6 Application Manual

SCG-2000 CARAVAN CONTROL SYSTEM WIRING DIAGRAM
• Space heating only
• Up to 15 space heating modules
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS
1
REQUIRED BY LOCAL CODE.
2
SHIELDED CABLE IS RECOMMENDED WHEN WIRING SENSORS.
REFER TO FIG. C1 ON PG. 29 FOR WIRING AT MODULES.
3
WHEN TERMINALS 5 AND 6 ARE JUMPED THERE IS A 120V OUTPUT
4
ON TERMINALS 10 AND 11. WHEN TERMINALS 5 AND 6 AND 16 AND 17
ARE JUMPED THERE IS A 120V OUTPUT ON TERMINALS 12 AND 13.
2.5 AMPS PER TERMINALS 10 AND 11 AND 12 AND 13 TOTAL 5 AMPS MAX.
SEQUENCE OF OPERATIONS - SCG2000
Space heating only
When the outdoor temperature falls below the outdoor start
temperature setting, the system is enabled. The microprocessor
control will energize the necessary modules to maintain sufficient
supply water temperature based upon outdoor air temperature. As
the outdoor temperature changes, the control system will increase or
decrease the number of operating modules to meet the supply water
CONTACTORS MUST HAVE ONE NORMALLY OPEN CONTACT PER
5
MODULE AND BE RATED ACCORDING TO MODULE CURRENT
LOAD, 6.0 AMPS PER BURNER.
4 SPACE HEATING MODULES SHOWN; UP TO 15 MODULES OF
6
SPACE HEATING MODULES CAN BE CONNECTED.
temperature required by the outdoor temperature. The modules
operate with automatic lead/lag, first on - first off (FOFO) or, after all
boilers are off, stage 1 is first on - then FOFO. A space sensor can
be installed (usually with most non-zoned systems). This modifies
the selected supply water temperature, to accurately meet the space
temperature selected. The control has built-in set-back programming
capability.
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