LAARS SC 12 - Install and Operating Manual - Manual (Page 15)

Page 15 Laars Sequencing Controls
SC-6P OUTPUT WIRING
INSTALLING THE OUTPUT RELAYS
♦
• Each OUTPUT which is to be used must have a relay installed in the socket. OUTPUT OUTPUT
• Each Boiler has an individual Pump associated with it.
• The SC-6P also has a SYSTEM relay which can be used for main or system pumps, or SYSTEM SYSTEM
any other application where an output is needed when any stage has been activated.
• Check the charts on the 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 OUTPUT which does not have a relay must have its stage switch to the OFF OUTPUT OUTPUT
position (see pg. 23).
WIRING THE STAGE OUTPUTS
• Each 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 relays, including the SYSTEM must not exceed 15A. SYSTEM SYSTEM
ON/OFF Units
• Each unit has one Pump relay and one Stage relay associated with it.
• Connect the N.O. pump relay contacts in series with the unit’s pump starter.
• Connect the N.O. boiler relay contacts in series with the unit’s limit circuit.
2 Stage (Lo/Hi) Units
• Each unit has one Pump relay and two Stage relays associated with it.
• Check the chart for the Pump, Lo and Hi OUTPUT positions. OUTPUT OUTPUT
• Connect the N.O. pump relay contacts in series with the unit’s pump starter.
• 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 one pump relay and three stage relays associated with it.
• Check the chart for the Pump, Lo, Mid and Hi OUTPUT positions. OUTPUT OUTPUT
• Connect the N.O. pump relay contacts in series with the unit’s pump starter.
• 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/Mid/Hi) Units
• The unit has one pump relay and four stage relays associated with it.
• Check the chart for the Pump, Lo, LoMid, HiMid and Hi OUTPUT positions. OUTPUT OUTPUT
• Connect the N.O. pump relay contacts in series with the unit’s pump starter.
• 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.
SC
Outputs
ON/OFF Units
2 Stage Units
3 Stage Units
4 Stage Units
NO
C
To Pump
Starter
NO
C
Limit
Circuit
Boiler Pump
Output
Boiler
Output
NO
C
To Pump
Starter
Boiler Pump
Output
NO
C
Limit
Circuit
Lo
Output
NO
C
Hi
Circuit
Hi
Output
NO
C
To Pump
Starter
Boiler Pump
Output
NO
C
Limit
Circuit
Lo
Output
NO
C
Mid
Circuit
Mid
Output
NO
C
Hi
Circuit
Hi
Output
NO
C
To Pump
Starter
Boiler Pump
Output
NO
C
Limit
Circuit
Lo
Output
NO
C
LoMid
Circuit
LoMid
Output
NO
C
HiMid
Circuit
HiMid
Output
NO
C
Hi
Circuit
Hi
Output
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.
♦ Additional output relays can be
ordered separately (CA002300). Each
active Stage Output must have a relay.