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12
Heat-Timer Corp.
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 the Prove terminals are shorted. DO NOT
remove the PROVE jumper supplied unless replacing it with a Prove signal.
wIrIng the systeM output (terMInals 19, 20)
•
The System output has a Normally Open (N.O.) relay that acts as a dry-contact. It does not source any power.
•
Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
System Output Operation in Set Point Mode
•
In Heating, 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 and then de-energize.
•
If the PROVE input is Open, the System relay will remain energized however, all stages will be de-energized.
If a Prove is not required, the factory-installed jumper must remain connected for proper operation.
•
In Cooling applications, the system relay will energize when the outdoor temperature is above the Outdoor Cutoff setting.
•
A typical use of the System output is to activate a system pump or its starter. The pump can run whenever there is a call for
heat/cool. When stages are no longer required, the pump will stay active for an adjustable Run-On delay and then de-energize.
System Output Operation in Reset Mode
•
The System output relay will energize whenever the outdoor temperature is below the Outdoor Cutoff.
•
When the outdoor temperature rises 2°F above the Outdoor Cutoff, the System output will remain energized for the period set
by the System Run-On and then de-energize.
wIrIng the dhw puMp (terMInals 21, 22)
The SQ-Elite-8T can control the DHW Pump when the DHW Pump Output option is activated from the Startup
Menu. See page 18.
•
The SQ-Elite-8T will energize the DHW Pump whenever there is a call for DHW using a dry contact or when
the DHW temperature falls below the DHW Set Point and DHW Differential when using a DHW sensor.
•
The DHW Pump output relay is a Normally Open (N.O.) dry contact. It does not source any power.
•
Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
•
If Shutdown was selected as the External Input (page 18), The Sq-Elite-8T will ignore a DHW call when the
Shutdown is active.
wIrIng the coMBustIon aIr daMper (terMInals 23, 24)
The SQ-Elite-8T can control the Combustion Air Damper when the Comb. Air Output option is activated in the
Startup Menu (Page 18). In addition, the PROVE input will function as the Combustion Air Damper status checker.
•
The SQ-Elite will energize the Combustion Air Damper relay whenever there is a call to energize any of the
unit stages.
•
The Combustion Air output relay is a Normally Open (N.O.) dry contact. 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 stages (terMInals 3 to 17)
The SQ-Elite can be configured to operate the stages of the heating or cooling units. Moreover, it can
be configured to operate the unit pumps or valves in addition to the unit stages.
•
The relays are N.O. dry contacts only. They do not source any voltage.
•
Wire the N.O. relay contacts in series with the unit's limit circuit.
•
Class 1 voltages must enter the enclosure through a different knockout from any Class 2 voltage
wiring.
wIrIng the stage outputs
•
Each Stage output (A through H) has one (N.O.) relay.
•
When wiring several multi-stage units, start with the lower stage of the first unit and wire it to
Output A, followed by the higher stage of the same unit and wire it to Stage B.
WARNING
DHW
Stage G
Stage H
SYSTEM
PUMP
16
18
15
17
19
20
21
22
L
N
System
Pump
DHW
COMB.
SYSTEM
Stage H
PUMP
AIR
17 18 19
20
21
22 23 24
L
N
DHW
Pump
DHW
COMB.
SYSTEM
PUMP
AIR
20
21
22 23 24
L
N
Comb.
Air
Damper
Stage A
Stage B
Stage C
Stage D
Stage E
3
4
5
6
7
8
9
10
11
12
Lo Hi
Lo Hi
Unit1
Unit2
Stages
Stages
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