LAARS M4-LHS - Installation Manual - Manual (Page 27)

HT# 059295-00
A
M4-LHS installation and Operation Manual
27
OPEraTiNg SETTiNgS
Program Change Switch Setting
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.
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
Season
Winter, Summer Default: Winter
Button: MENU/Season
• The M4-LHS will turn all boiler relays off when it is in Summer setting. However, an
indirect DHW call will bring boilers back on when needed. The Message Display Line will
display Summer to show the status.
• In Winter, the M4-LHS will activate the System relay whenever the Outdoor Temperature
(OD) falls below the Outdoor Cutoff setting. The Message Display Line will not show any
season information when in Winter.
• When the heating season is over, it is a good practice to switch the M4-LHS to Summer
setting. This will allow the control to sequence the boilers on an indirect DHW call.
----- SEASON -----
Winter
Summer
BACK ▲ ▼ SAVE
aLErT
DO NOT turn power off to the
M4-LHS when heating season
is over. If you do so, the battery
will run down and will have to
be replaced. Instead, switch to
Summer.
Set Point
Adjustable 70ºF - 250ºF Default: 70ºF
(Not Available for Hybrid Boiler Types)
Button: MENU/Set Point
• The Set point is the temperature value the M4-LHS will use to control the system.
• The M4-LHS will increase, decrease or hold the modulation of the boilers to maintain the
system temperature around the Set point.
• The system can be expected to fluctuate around the set point. The amount of fluctuation
depends on the modulation settings and stage Settings.
• If the EMS Input Mode was Enabled, the Set Point will be set by the EMS system and will
be available to be read but not changed on the display. See "EMS Input Mode" on page 19.
----- SET POINT -----
0 o F
[
]
BACK ▲ ▼ SAVE
reset ratio
Adjustable 1.00ºOD : 4.00ºSys to 4.00ºOD : 1.00ºSys Default: 1.00ºOD : 1.00ºSys
Button: MENU/System Target
• The Reset Ratio determines how the System water temperature (SYS) will vary with
Outdoor Temperature (OD). With any of the ratios, the colder it becomes outside, the hotter
the temperature of the system water. See "Outdoor Reset Concept" on page 5.
• With a 1.00 (OD):4.00 (SYS) ratio, the System water temperature (SYS) will increase
rapidly as the outside temperature falls, hitting the maximum of 240°F at 24°F outside
temperature. With a 4.00 (OD):1.00 (SYS) ratio, the System water temperature (SYS) will
increase slowly as the outside temperature falls. Even at -30°F, the system water will only
be 125°F, and at 24°F outside, the system water will be 112°F. Such a low Reset Ratio
might be used with radiant floor heating applications.
• With most baseboard heating applications, a 1.00 (OD):1.00 (SYS) setting is a good place to
start. With a 1.00 (OD):1.00 (SYS) ratio, for every degree the outside temperature falls, the
system water temperature is increased one degree.
• If required: Adjust the RESET RATIO in cold weather. If the ambient building
temperatures are too low in cold weather, move the ratio to a higher selection. That is,
if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25
(SYS). If the building temperatures are too warm in cold weather, move the ratio to a lower
selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to
1.25 (OD):1.00 (SYS).
-- SYSTEM TARGET --
1.00
o
OD = 4.00
o
Sys
1.00
o
OD = 3.00
o
Sys
1.00
o
OD = 2.00
o
Sys
1.00
o
OD = 1.50
o
Sys
1.00 o OD = 1.25 o Sys
1.00
o
OD = 1.00
o
Sys
1.25
o
OD = 1.00
o
Sys
1.50
o
OD = 1.00
o
Sys
2.00
o
OD = 1.00
o
Sys
3.00 o OD = 1.00 o Sys
4.00
o
OD = 1.00
o
Sys
BACK ▲ ▼ SAVE
Outdoor Temperature
W
at
er
T
em
pe
ra
tu
re
70 40 50 60
130
120
110
100
Outdoor Temperature
W
at
er
T
em
pe
ra
tu
re
70 40 50 60
110
100
90
80
Outdoor Temperature
W
at
er
Te
m
pe
ra
tu
re
70 40 50 60
150
140
130
120
1:4
With a 0° Offset, the
Reset curves begin at
100° Water Temperature.
With a -20° Offset, the
Reset curves begin at
80° Water Temperature.
With a +20° Offset, the
Reset curves begin at
120° Water Temperature.
1:4
1:4 1:1
1:1
1:1
4:1
4:1
4:1
90
100
+20 Offset
-20 Offset
Outdoor Temperature
W
at
er
T
em
pe
ra
tu
re
70 40 50 60
130
120
110
100
1:4 1:1
4:1
Colder
Warmer
reset ratio