LAARS M4-Ext - Installation Manual - Manual

HT# 059104-00 B
Laars Condensing and Non-Condensing
Boiler Controls
Document 4217B
Modulating
Model M4-CNC and
M4-Ext
Output panel to Modulate and
Sequence up to 16 individual
stages with lead-lag and
manual override capabilities
FOR YOUR SAFETY:
This product must be installed and serviced by a
professional service technician, qualified in hot water heater/boiler controls
installation and maintenance. This manual is intended for anyone who will
install, operate or maintain the control system. Before you begin installation and
operation of this control, it is important that you thoroughly review this manual.
Improper installation and operation could result in damage to equipment and
possibly even personal injury. Laars Sequencing Controls are not intended
for use as operation safety limit controls. Another control, that is intended and
certified as a high limit control, must be in the water heater/boiler control circuit.
FOR ALL CIRCUITS
120VAC, 6A RESISTIVE
OUTPUT RATINGS:
1A PILOT DUTY, 15A TOTAL
115VAC 60Hz , 12VA MAX
INPUT RATINGS:
USE COPPER CONDUCTORS 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
SYSTEM
A
B
C
D
RUN PROGRAM
12 13 15 14 17 16 18 22 20 19 21 24 23
- + + mA GND VLT
CUR / VLT
A
- + + mA GND VLT - + + mA GND VLT - + + mA GND VLT + mA
CUR / VLT
B
CUR / VLT
C
CUR / VLT
D
OD= 25 o F SYS= 145 o F
<> B D
100% 52% --- ---
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
29 25 27 26 28 32 30 31
T T O O
TEMP
OUTDOOR
O O
TEMP
SYSTEM PROVE /DHW
SHUTDOWN
/TSTAT
/SETBACK
1 2 3 4 5 6 7 8 9 10 11
L N RS-485
SYS A B C D PWR EXTENSION
MODULE
M4-CNC
CONDENSING AND NON-CONDENSING
PATENT PENdiNg