Siemens LME7 Series Technical Instructions page 125

LME Series
Honeywell Modutrol IV with the LME75
Introduction
The Siemens LME75 burner control is designed specifically for use with a Siemens SQM4... or
SQM5... series actuator. However, with some simple programming changes and the addition of
only a few relays, the LME75 can be set up to safely and effectively control a Honeywell
Modutrol IV motor.
An LME75.000A1 burner control with the PME75.811A1 program module must be used. No
other LME7... burner control or PME7... program module will successfully work in this
application. The Honeywell Modutrol IV motor must have high fire and low fire limit switches
and can be either a 0-135 Ohm or 4-20 mA motor.
There are two separate procedures outlined below. The first procedure summarizes how to
properly connect the LME75 to the Honeywell Modutrol IV motor when valve proving is not
being used. This procedure only requires two relays (one DPST relay and one SPDT relay).
The second procedure explains how to connect the LME75 to the Honeywell Modutrol IV motor
when valve proving is being used. This procedure requires four relays (one 3PST relay, one
SPDT relay, and two SPST relays).
Setup Procedure without Valve Proving
1. The following procedure should be used when valve proving is not being utilized.
2. Set the following parameters in the LME75 as described below:
Parameter 241 = 0
Parameter 259 = Greater than or equal to the running time of the Honeywell
Parameter 260 = Greater than or equal to the running time of the Honeywell
Parameter 515.01 = 1
Parameter 560 = 0
3. Wire the LME75.000A1 burner control, Honeywell Modutrol IV motor, and two relays as
shown in Figure A-1. See Section 4 for more details on how to wire in other devices to
the LME75.
SCC Inc.
Modutrol IV motor being used
Modutrol IV motor being used
Page 3
Technical Instructions
Document No. LME-1000
Appendix A