LAARS M4-LHS - Installation Manual - Manual (Page 31)

HT# 059295-00
A
M4-LHS installation and Operation Manual
31
SYSTEM SETTiNgS
Button: MENU/
Settings 1 and Settings 2 menus provide access to adjusting and fine-tuning the system for
enhanced comfort and better fuel savings. The M4-LHS behaves differently based on the
selected modes. See "Startup Settings" on page 19.
----- SETTINGS 1 ----
Setback 0
o
F
Purge Delay 1.0min
System Run-On 0min
Lead Rotation Time
BACK ▲ ▼ SELECT
----- SETTINGS 2 ----
Standby Time 10min
Last Stg Hold 0 o F
BACK ▲ ▼ SELECT
SYSTEM
A
B
C
D
1 2
RUN PROGRAM
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
3 4 5 6 7 8 9 10 11 12 13 15 14 17 16 18 20 19 21 24 23 29 25 27 26 28 32 30 31
L N
- + +
T T O O RS-485 mA GND VLT
SYS A B C D PWR
CUR / VLT
A
- + +
mA GND VLT
- + +
mA GND VLT
+ +
mA
22
-
GND VLT
+
mA
TEMP
OUTDOOR
O O
TEMP
SYSTEM EXTENSION
MODULE CUR / VLT
B
CUR / VLT
C
CUR / VLT
D
PROVE
/DHW
SHUTDOWN
/SETBACK
FOR ALL CIRCUITS
120VAC, 6A RESISTIVE
OUTPUT RATINGS:
1A PILOT DUTY, 15A TOTAL
115VAC 60Hz , 30VA MAX
INPUT RATINGS:
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
CAUTION: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
/TSTAT
M4-LHS
HYBRID CONTROL
aLErT
To be able to change the M4-LHS settings the Program/Run Switch must be
set to Program. The switch is located under the Enclosure Wiring Cover for
security. The Enclosure Wiring Cover can be secured using a lock.
Setback
Adjustable from 0F°/0C° to 75F°/42C° Default: 10F°/6C°
Button: MENU//Setback
• The Setback feature can be used to provide the M4-LHS with a lower temperature Set Point
when less load is required.
• The lower Set Point will appear on the main display indicating this condition.
• For example, if the calculated temperature is 180°F and the Setback is 20°F, then when in
Setback or Night Schedule, the M4-LHS will hold a Set Point of 160°F = 180°F- 20°F. See
"Day - Night Schedule" on page 36.
• A typical use for the Setback is to provide less system temperature to a building during
the Night Schedule or on the weekends when people are asleep or when the building is not
occupied, but heat is still needed.
• The amount of Setback selected is subtracted from the Set Point when a Setback Input
Signal is received or the Night Time schedule setting started.
• If Setback is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/Setback
Mode" on page 24.), the Setback will not be activated unless a Short dry-contact signal is
received on terminals (31 and 32).
• If Shutdown or Tstat is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/
Setback Mode" on page 24.), the Setback will be activated only during the Night Schedule.
------- SETBACK -------
10 o F
[ ]
BACK ▲ ▼ SAVE
aLErT
When using Soft-Off and Last
Stage Hold, the last boiler stage will
not turn off until both parameters
have elapsed. In this case, Soft-Off
will start after the Last Stage Hold.
Purge Delay
Adjustable from 0.0 min to 10.0 min Default: 1.0 min
Button: MENU//Purge Delay
• Many boilers go through a purge cycle before they are brought on line. When the M4-LHS
activates a boiler, it does not start to calculate its output until the Purge Delay is over. This
allows the boiler to fully come online and begin producing.
• The Purge Delay helps prevent short cycling of any newly activated burner. Once the
burner is activated, it MUST run through the entire Purge Delay period.
• The minimum Purge Delay setting MUST be set to the time required by the boiler
manufacturer. Time entry is in 0.1 of a minute (i.e. 1.5 minute will equal 90 seconds.)
• The Message Display Line will display Purge Delay and the remaining time.
--- PURGE DELAY ---
1.0 min
[ ]
BACK ▲ ▼ SAVE
aLErT
Set Purge Delay as per boiler
manufacturer recommendation.
System run-On
Adjustable from 0 min to 360 min Default: 10 min
Button: MENU//System run-On
• A common use for the System Run-On is to control a system pump in a heating system.
The extra time helps transfer the boiler residual heat to the heating system.
• The System relay will energize whenever the outdoor temperature is below the Outdoor
Cutoff and the Shutdown is Open or the Tstat is closed. When the Outdoor Temperature
rises 2°F above the Outdoor Cutoff or the control is switched to Summer and after the last
burner relay has de-energized, the System relay will remain energized for the System Run-
On period.
-- SYSTEM RUN-ON --
10 min
[ ]
BACK ▲ ▼ SAVE