LAARS MFTCW, MFTHW, FTCF, FTHF Won't achieve HIGH Temperature. Boiler won't go into high fire.
An Outdoor
Temperature Reset Supplied with the Boiler MUST MUST MUST be used.
The D.O.E
(department of energy) regulations regarding outdoor temp. reset DOES affect
this boiler in most all serial # date of manufacturer #'s !
It has been noted
that all MFTHW . FTHF , FTCF and many MFTCW models are
affected .
As per the D.O.E ,
the maximum temperature achieved is 140 degrees F (minus the differential of 8 degrees F) without an outdoor sensor or
some form of external modulation. ie tekmar (0-10) , (4-20).
* For troubleshooting and testing purposes, a 100K resistor wired to the O/S terminals of the boiler (in place of outdoor sensor) can be utilized.
Related Articles
LAARS FT 301/399 Cascading Instructions
LAARS FT 301/399 Cascading Instructions Cascade cables Cascade programming Click on attachment to view
LAARS FT 301/399 Overview
LAARS FT 301/399 Overview Dimensions Options Accessories Floor stand Click on attachment to view.
Generation 2 Laars MFTCW Dip Switch Settings
See attachments for Laars MFTCW Generation 2 Dip Switch Settings .
LAARS MFTCW, MFTHW, FTCF, FTHF- 80, 100, 140, 199 Internal Pump Noise -Harmonic Noise
LAARS MFTCW, MFTHW, FTCF , FTHF-80,000, 100,000, 140,000. 199,000 BTU's. A "HARMONIC", "HUMMING" noise may be noticed when the internal primary/secondary pump is running. This noise can radiate/disperse thru out the home and can be very annoying, ...
Cascading the Laars FT Series Floor and Wall HEATING ONLY Boilers
Cascading the Laars FT Series Floor and Wall HEATING ONLY boilers. https://www.laars.com/images/uploads/products/1349C.pdf