Lochinvar Harmony - Manual (Page 19)

19
STANDBY TIME Default - 10 min
• The Standby Time only applies to Stages in Standby Mode.
• A Standby Stage can only be activated after all the Stages in Auto
Mode have run at 100% modulation for the full Standby Time.
• Standby Stages are used for backup up or extreme load conditions
only. A Standby Stage can never be a Lead Stage
• The full Standby Time must always elapse regardless of what
happens to system temperature. Therefore, shorter Standby Times
will result in smoother set point operation in extreme conditions.
Longer Standby Times will result in more loss of load, but may
prevent a Standby Stage from firing if the other stages can eventu-
ally meet the load, or if the load decreases.
SYSTEM RUN-ON Default - 0 min
• The SYS output relay will energize whenever there is a call for output
and the Shutdown feature is not active.
• The SYS will remain energized while any Stage is active. When the
last Stage relay turns off, the SYS output will remain energized for
the period of time set by the System Run-On.
• If the System Run-On is set to 0, the SYS output will turn off
immediately when the last Stage turns off.
• A common use of the SYS output is to control a system pump in a
heating system. After the last Stage is turned off, it is often desirable
to run the system pump for an additional period of time to transfer
the residual heat from the boilers to the heating system.
SYSTEM SETTINGS 2
SETBACK Default - 0
• Setback is not available in the Reset, or 4-20mA EMS-Control mode.
• The Setback feature can be used to provide the Harmony with a
lower temperature Set Point when less load is required.
• The lower Set Point will appear on the main display indicating this
condition.
• A typical use for Setback is to providea lower system temperature to
a factory during the night or on the weekends when product is not
being manufactured but heat is still required.
• The Setback will not be activated unless a signal is wired into the
Harmony EMS terminals. See pg. 7 for wiring.
• The amount of Setback selected is subtracted from the Set Point
when a Setback signal is received.
• For a example, if the Set Point is 180°F and the Setback is 20°F, then
when the EMS SIGNAL and SHIELD terminals are closed, the
Harmony will hold a Set Point of 160°F.
- SYSTEM SETTINGS 1-
Lag Delay
>Standby Time
System RunOn
-- STANDBY DELAY --
Value -> New Value
-- STANDBY DELAY --
Value -> New Value
PRESS TO SELECT
ADJUST
Press to
show
setting
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
Press to
select
new
- SYSTEM SETTINGS 1-
Standby Time
>System RunOn
<More Settings>
-- SYSTEM RUN-ON --
Value -> New Value
-- SYSTEM RUN-ON --
Value -> New Value
PRESS TO SELECT
ADJUST
Press to
show
setting
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
Press to
select
new
- SYSTEM SETTINGS 1-
Standby Time
System RunOn
><More Settings>
--- SETBACK ---
Value -> New Value
--- SETBACK ---
Value -> New Value
- SYSTEM SETTINGS 2-
>Setback
Rotate Time
Last Stg Hold PRESS TO SELECT
ADJUST
Press to
show
setting
PRESS TO SELECT
ADJUST
Turn to
adjust
value
PRESS TO SELECT
ADJUST
Press to
select
new
PRESS TO SELECT
ADJUST
Press to
show
more
SYSYSYSYSY
STEM SETTINGS 2STEM SETTINGS 2STEM SETTINGS 2STEM SETTINGS 2STEM SETTINGS 2