heat-timer SQ-Elite-EXt, Installation And Operation Instruction Manual

Page: 10 / 44

10 Heat-Timer Corp.
wIrIng tHe doMestIc Hot water Input
(terMInals 25 26)
• DHW can be used to raise system Set Point to 200°F or Maximum Target, whichever is lower. DHW Piping
concept must be selected from the Startup Menu. See DHW Piping in Startup on page 13 and DHW Priority Timer
on page 2
9
.
•
DHW
Call input terminals can accept only a dry-contact input.
• Wire an aquastat or other controls to provide dry-contact closure on the
DHW terminals.
• If
Shutdown
was selected as the External Input 1, a DHW call will be ignored when the Shutdown is active.
27 29 28 25 26
SEQ
Temp
DHW
DHW Call Dry Contact
wIrIng tHe sHutdown
(terMInals 35, 36)
• This feature will only be available when
Shutdown
is selected as the External Input 1 option from the Startup
menu. See External Input 1 on page 19
.
• This feature can be used whenever it is desirable to turn off the SQ-Elite-MV stage as well as close the motorized
valve from a remote location or another controller (i.e. EMS input).
• When the Shutdown feature is enabled by closing its dry-contact, all active stages will immediately turn off and the
motorized valve close relay (MOV CLOSE) will energize for six minutes to guarantee valve closure. The System
and boiler pumps' or valves' relays will remain energized for the Run-On delay period and then turn off.
• The Shutdown signal must be a dry-contact only. No voltage can be placed across the
Shutdown terminals.
• Note that when the Shutdown is active, no DHW operation will take place.
MOV
Temp
33 35 34 36 37 38
SHUTDOWN
/TSTAT
/SETBACK
SEQ Prove
/MOV TSTAT
Shutdown Dry Contact
wIrIng tHe seQ tstat
(terMInals 35, 36)
• This feature will only be available when
Tstat
is selected as the External Input 1 option from the Startup menu.
See External Input 1 on page 19
.
• This feature can be used whenever it is desirable to turn on the SQ-Elite-MV stages on from a remote location or
another controller (i.e. EMS input).
• When the Tstat feature is enabled by closing a dry-contact, the SQ-Elite-MV will sequence the stages to achieve the
desired SEQ Set Point. However, when the terminals are opened, all stages will de-energize.
• The Tstat signal must be a dry-contact only. No voltage can be placed across the
Tstat terminals.
MOV
Temp
33 35 34 36 37 38
SHUTDOWN
/TSTAT
/SETBACK
SEQ Prove
/MOV TSTAT
SEQ
T
stat
Dry Contact
wIrIng tHe seQ setBack
(terMInals 35, 36)
• This feature can be used whenever it is desirable to reduce the SQ-Elite-MV boiler loop temperature from a remote
location (i.e. EMS input or external time clock). It will only be available when
SEQ Setback
is selected as the
External Input 1 option from the Startup menu. In addition, no setback scheduling will be available. See
External
Input 1 on
page
19
.
• When the Setback is enabled by closing a dry-contact, the SEQ Target (boiler loop target temperature) 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.
MOV
Temp
33 35 34 36
37 38
SHUTDOWN
/TSTAT
/SETBACK
SEQ Prove
/MOV TSTAT
SEQ Setback Dry Contact
wIrIng tHe seQ proVe
(terMInals 37, 38)
• For these terminals to function as a Prove signal,
SEQ Prove
must be selected from External Input 2 Startup
menu. See External Input 2 on page
19
.
• The
PROVE
input can be used to check on the SEQ System Output. A typical use of this feature is to check for
system pump flow or a combustion air damper status before energizing any stage.
• If the PROVE input is open, the SQ-Elite-MV will leave the SEQ System Output energized. However, all stage
outputs will be off.
• A factory-installed jumper provides the SEQ System Prove signal. Do not remove the jumper unless it will be
replaced by a SEQ System Prove signal.
• No voltage can be placed across the
SEQ Prove terminals
RS485
35 36 37 38
SHUTDOWN
/TSTAT
/SETBACK
SEQ Prove
/MOV TSTAT
SEQ Prove Dry Contact
warnIng
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 or changing input functionality.