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10
Heat-Timer Corp.
WIrIng tHe t-stat (terMInals 35, 36)
•
This feature can be used whenever it is desirable to switch the SQ-Elite-8S to operate from a remote location
(i.e. EMS input or thermostat). It will only be available when Tstat is selected as the External Input Mode option
from the Startup menu on page 15.
•
When the Tstat is enabled by closing a dry contact, the SQ-Elite 8S will activate the heating logic.
•
The Tstat signal must be a dry contact only. No voltage can be placed across the TSTAT terminals.
•
Bring the two wires from the dry contact to the terminals marked TSTAT- 35,36.
•
When Tstat is selected, Setback will be available using the programmed Day/Night schedule.
WIrIng tHe setback (terMInals 35, 36)
•
This feature will only be available when Setback is selected as the External Input Mode option from the Startup
menu on page 15.
•
It can be used when it is desirable to switch the SQ-Elite-8S to operate in Setback from a remote location (i.e.
EMS input or external time clock). No Day/Night scheduling options will be available with this feature.
•
When the Setback is enabled by closing a dry contact, the Target will be reduced by the Setback value.
•
The Setback signal must be a dry contact only. No voltage can be placed across the SETBACK terminals.
•
Bring the two wires from the dry contact to the terminals marked SETBACK- 35,36.
WIrIng tHe prove (terMInals 37, 38)
•
The Prove feature is provided to check system component operation before energizing the stages. It can be
used to check on the Combustion Air Damper by connecting it to the end switch of the damper. In this case, the
Comb. Air Output option must be activated from the Startup Menu on page 15.
•
If the Comb. Air Damper Output option was not activated, the PROVE input can be used to check on the System
Output. A typical use of this feature is to check for system components before energizing any stage.
•
If the PROVE input is open on a call, the SQ-Elite-8S will enable only the System and Comb. Air Output relays.
All stage outputs will be off.
•
A factory-installed jumper provides the System Prove signal. Do not remove the jumper unless it will be
replaced by a Prove signal.
•
Bring the two wires from the prove dry contact source to the terminals marked PROVE - 37 38 No voltage can
be placed across the PROVE terminals
The PROVE input cannot be used as a safety limit. All equipment must have its own certified limit and safety
controls as required by local codes. No boiler stage will start unless Prove terminals are shorted. DO NOT remove
the PROVE jumper supplied unless replacing it with a Prove signal.
WIrIng tHe outputs
WIrIng tHe systeM output (terMInals 19, 20)
•
The System output relay will energize whenever the outdoor temperature drops below the Outdoor Cutoff or
whenever a stage output is active. If no outdoor sensor is connected and the last boiler relay has de-energized,
the System relay will remain energized for a period set by the Run-On then de-energize.
•
No stage outputs will be activated until the PROVE input is shorted.
•
The System output has one Normally Open (N.O.) dry contact relay. It does not source any power.
•
Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring
WIrIng tHe coMbustIon aIr daMper (terMInals 23, 24)
•
The SQ-Elite can control the Combustion Air Damper when the Comb. Air Output option is activated in the
Startup Menu on page 15. In this scenario, the PROVE input will be used to check on the Combustion Air
Damper status.
•
The SQ-Elite will energize the Combustion Air Damper relay whenever there is a call to energize any of the
boiler stages.
•
The Combustion Air output has one Normally Open (N.O.) dry contact relay. It does not source any power.
•
Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
WarnIng
y
Auxiliary
SHUTDOWN
PROVE
TSTAT
Input3
/SETBACK
2
33
34
35
36
37
38
y
Auxiliary
SHUTDOWN
PROVE
TSTAT
Input3
/SETBACK
2
33
34
35
36
37
38
RS485
DOWN
AT
PROVE
BACK
36
37
38
DHW
COMB
PUMP
AIR
21 22 23 24
L
N
Comb.
Air
Damper
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