LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 17)

Mighty Therm LO-NOx Hydronic Boiler Page 17
3. Electrically interlock the pump and boiler so the
boiler cannot come on unless the pump is
running.
4. Connect all field-installed devices (draft
switches, relays, timers, outdoor temperature
reset devices, etc.) to the boiler wiring at points
labeled Field Interlock.
SECTION 3.
Operating Instructions
NOTE: Safe lighting and other performance criteria
were met with the gas manifold and control assembly
installed on the boiler during tests specified in ANSI
Z21.13.
WARNING
For your safety, when starting the boiler, keep your
head and face well away from the lower firebox
opening to prevent any risk of personal injury.
Vent pipes, drafthoods, and boiler tops get hot!
These surfaces can cause serious burns. Do not
touch these surfaces while the boiler is in operation.
MISE EN GARDE
Pour assurer sa sécurité, la personne qui allume la
chaudière devrait garder la tête le plus éloignée
possible de l’ouverture inférieure de la chambre de
combustion afin de prévenir tout risque de blessure
au moment de l’allumage.
Les tuyaux d’évent, les coupe-tirage et la surface
supérieure des chaudières deviennent très chauds !
Toucher à ces surfaces peut occasionner des
blessures sérieuses. Ne pas toucher à ces surfaces
alors que la chaudière fonctionne.
3.1 Start-Up Procedure
1. Make sure the system pump is running and there
is water flow.
2. Follow the lighting and shutdown procedure in
Figure 28 or 29.
3.2 Setting the Temperature Controls
Caution
On a boiler equipped with the vent damper device,
the damper must be in the open position when the
main burners are operating.
Avertissement
Le registre des chaudières munies d’un dispositif
de volet motorisé doit être en position ouverte lors
que les brûleurs principaux fonctionnent.
Figure 27. Temperature Controls.
Manual Reset Hi-Limit
Temperature Controller
To set the temperature and high-limit controls:
1. Set the temperature controller at the system
design temperature.
2. For boilers with the temperature controller bulb
at the boiler inlet, set the high-limit 40°F to 50°F
above temperature controller setting.
3. For boilers with the temperature controller bulb
at the boiler outlet, set the high-limit 15°F to
25°F above temperature controller setting.
3.3 Hi-Limit Switch Checkout
After running the boiler for a long enough period,
bring the water temperature within the range of the hi-
limit switch and slowly back off the high limit setting
until the boiler shuts off. The main burners should
reignite (following the normal ignition cycle) when the
hi-limit switch is reset and turned back up to its
original setting. The boiler should now run until it
shuts off automatically on operating control.
Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the
boiler (refer to troubleshooting section).
3.4 Shut-Down Procedure
Shut down the boiler following the instructions in
Figures 28 and 29.
Where there is a danger of freezing, shut off the
water supply and remove the drain plugs on both sides
of the boiler jacket. Drain every part of the system
subject to damage from freezing temperatures.
OUT OF
PRODUCTION