User Guide

Page 4
LAARS HEATING SYSTEMS
D. Air Shutter Adjustment (when required)
1. STOP! Read the safety information on the last page.
2. Perform a System Start-Up in accordance with
Section A of this manual.
3. Remove the burner cover by loosening the two
thumbscrews.
4. Observe the ame pattern on all burners. If the
ame on any burner is pulsing, unstable or lifting
continue with this procedure. Otherwise skip to
step 10.
5. On all burners exhibiting an abnormal ame, loosen
but do not remove the air shutter locking screw
using a 5/16 inch wrench. (See Fig. 5 below.)
6. On each affected burner, slowly close the air
shutter until a normal ame is observed, then re-
tighten its associated locking screw.
7. Turn the boiler off.
8. Perform a System Start-Up in accordance with
Section A of this manual.
9. Observe the ame pattern on all burners. If
the ame on any burner is pulsing, unstable or
lifting, repeat steps 5 and 6 until all burners are
exhibiting a normal ame.
10. Re-install the burner cover and tighten it in place.
LOCKING SCREW
(5/16" HEAD)
AIR SHUTTER
BURNER
Boiler Type of Valve
Model Size Sufx* Gas Part No. Mfr. No. Manufacturer
JVS 50-75 D NAT V0077400 VR8304H HONEYWELL
JVS 100-225 K NAT V0079000 VR8304H HONEYWELL
JVS 50-75 D LP V0077500 VR8304H HONEYWELL
JVS 100-225 K LP V0079100 VR8304H HONEYWELL
JVH 50-160 C NAT V2001800 SV9501H HONEYWELL
JVH 225 C NAT V2001900 SV9601H HONEYWELL
JVH 50-225 C LP V2002300 SV9501H HONEYWELL
*Sufx Denitions C = On/Off Firing
D = On/Off Firing
K = Two-Stage Firing
Figure 5 - Removing the Air Shutter Locking Screw
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone]
1355 Kuehner Drive, Simi Valley, CA 93063 • 800.900.9276 • Fax [phone] (Sales, Service)
1869 Sismet Rd., Mississauga, Ontario, Canada LHW 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com
Printed in U.S.A. © Laars Heating Systems 1212 1026w
Table 1 - Gas Control Valves
Note: The warranty does not cover any damage
caused by lack of required maintenance or
improper operating procedures.
H2355700A