LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 5)

Mighty Therm LO-NOx Hydronic Boiler Page 5
1. Remove the top plate, stamped "HOT", by
slipping a fine-blade screwdriver into the slot and
prying it up (see Figure 2).
2. Remove the top by removing all eight screws
connecting it to the jacket (see Figure 3).
3. Remove the rainguard assembly (see Figure 4).
4. Remove the two screws securing the left
vestibule cover (see Figure 5). The cover can be
discarded.
5. Remove the vent cap or drafthood and
accessories from the carton.
NOTE: Vent cap is for outdoor installation, when
required.
6. Place transition plate (with 14" long side)
securely on top of flue collector so flue gases will
not leak (see Figure 6).
7. Remove back portion of rainguard (see Figure 7).
8. Re-install the rainguard (see Figure 8).
9. Replace boiler top and all eight screws (see
Figure 9).
10. Slide the adapter plate up over the bottom of the
stack extension. Fit the stack extension, of the
drafthood or the vent cap, on top of the collar of
the flue transition plate (see Figures 10 and 11).
11. Seat the adapter plate on the top assembly, and
secure it with screws supplied in the kit (see
Figure 12).
12. Attach the clips to the adapter plate by securing
the slotted side of the clips with the screws in the
kit (see Figure 13).
13. Use the holes in the clips as guides to drill three
1/8" dia. holes in the stack.
14. Secure the stack to the clips with the screws
supplied in the kit (see Figure 13).
15. Figure 14 shows a cross-section of the finished
installation.
16. Find the vent damper box which is located in the
boiler package (boiler model 250 only).
17. Install the vent damper directly to the top of the
draft hood outlet. The damper operator should
face to the front of the boiler, and the flow
direction arrow should point upward. Use the
vent damper wire harness to connect the vent
damper to the boiler. The bracket end of the
harness should be connected to the vent damper
actuator (see Figure 16).
18. Plug the wiring for the drafthood switch into the
receptacle on the left side of the vent damper box
(see Figure 15).
19. Do not modify the automatic vent damper device.
The venting system must be arranged so that only
the boiler is served by the vent damper device
supplied with the boiler. Provide at least six
SECTION 2.
Installation Instructions
2.1 General Information
WARNING
Improper installation or maintenance can cause
nausea or asphyxiation from carbon monoxide in
flue gases which could result in severe injury,
property damage or death. Follow the
manufacturer’s maintenance schedule for the
appliance. Follow local regulations with respect to
installation of carbon monoxide (CO) detectors.
MISE EN GARDE
Une mauvaise installation ou un entretien inadéquat
peut être la cause de nausées ou d’asphyxie en
raison de la présence de niveaux dangereux de
monoxyde de carbone dans les résidus de
combustion et peut entraîner des dommages
matériels, des blessures ou même la mort. Suivre
les directives du fabricant au sujet du programme
d’entretien de l’appareil. Suivre les règlements
locaux touchant l’installation de détecteurs de
monoxyde de carbone (CO).
All gas-fired products require correct installation
to assure safe operation. The requirements for boilers
include the following:
1.
Field assembly of drafthood or vent cap (see
Section 2.2).
2. Appropriate site location clearances and flooring.
3. Sufficient combustion and ventilation air.
4. Adequate venting of combustion products.
5. Adequate water flow.
6. Properly sized gas meter and piping.
7. Proper electrical wiring.
This manual provides the information needed to
meet these requirements. Review all application and
installation procedures completely before continuing
the installation.
2.2 Field Assembly
The HH, PH boilers are shipped from the factory
with the top assembly in the low-profile configuration
for outdoor installations.
The HH, PH boilers are design certified for
indoor installation when equipped with a special
drafthood, which must be installed without
modification. The part number for the drafthood is on
the boiler rating plate. Follow this procedure to make
the conversion:
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