LAARS SC 12 - Install and Operating Manual - Manual (Page 14)

Page 14 LAARS Heating Systems
♦ Additional output relays can be
ordered separately (CA002300). Each
active Stage Output must have a relay.
WARNING
This Laars Heating Systems control is strictly an operating control; it should
never be used as a primary limit or safety control. All equipment must have
its own certifi ed limit and safety controls required by local codes. The installer
must verify proper operation and correct any safety problems prior to the
installation of this Laars Heating Systems control.
SC
Outputs
Output
NO
C
Limit
Circuit
ON/OFF Units
Lo
Output
2 Stage Units
Hi
Output
NO
C
Hi
Circuit
Lo
Output
3 Stage Units
NO
C
Mid
Output
Hi
Output
Lo
Output
4 Stage Units
LoMid
Output
HiMid
Output
Hi
Output
NO
C
Limit
Circuit
NO
C
Limit
Circuit
NO
C
Mid
Circuit
NO
C
Hi
Circuit
NO
C
Limit
Circuit
NO
C
LoMid
Circuit
NO
C
HiMid
Circuit
NO
C
Hi
Circuit
SC-6 and SC-12 OUTPUT WIRING
INSTALLING THE OUTPUT RELAYS
♦
• Each output (OUTPUT 1 through OUTPUT 12) which is to be used must have
a relay installed in the socket.
• Check the charts on pg. 17 to locate where the relays should be installed for
each particular type of installation.
• To install a relay, orient the pins and then press it gently into the appropriate socket.
• Any Stage Output which does not have a relay must have its stage switch to the OFF
position (see pg. 23).
WIRING THE STAGE OUTPUTS
• Each Stage Output has one Normally Open (N.O.) relay contact.
• The N.O. contacts are dry contacts only. They do not source any voltage.
• Each N.O. contact is capable of switching 6A resistive.
• Total output of all stages, including the SYSTEM, must not exceed 15A.
ON/OFF Units
• Each unit has one relay and one set of Stage OUTPUT contacts associated with it. OUTPUT OUTPUT
• Wire the N.O. relay contacts in series with the unit’s limit circuit.
2 Stage (Lo/Hi) Units
• Each unit has two OUTPUT relays associated with it. OUTPUT OUTPUT
• Check the chart (pg. 17) for the Lo and Hi Stage Output positions.
• Connect the Lo N.O. relay contacts in series with the unit’s limit circuit.
• Connect the Hi N.O. relay contacts to the Hi control circuit.
3 Stage (Lo/Mid/Hi) Units
• Each unit has three OUTPUT relays associated with it. OUTPUT OUTPUT
• Check the chart (pg. 17) for the Lo, Mid and Hi Stage Output positions.
• Connect the Lo N.O. relay contacts in series with the unit’s limit circuit.
• Connect the Mid N.O. relay contacts to the Mid control circuit.
• Connect the Hi N.O. relay contacts to the Hi control circuit.
4 Stage (Lo/LoMid/HiMid/Hi) Units
• The unit has four OUTPUT relays associated with it. OUTPUT OUTPUT
• Check the chart (pg. 17) for the Lo, LoMid, HiMid and Hi Stage Output positions.
• Connect the Lo N.O. relay contacts in series with the unit’s limit circuit.
• Connect the LoMid N.O. relay contacts to the LoMid control circuit.
• Connect the HiMid N.O. relay contacts to the HiMid control circuit.
• Connect the Hi N.O. relay contacts to the Hi control circuit.