User Guide

2
Basic Operation
A. General. This water boiler is a natural draft appliance and is equipped with controls for proper
operation. All controls must be in proper working order. Contact a qualified service agency to provide
annual maintenance as specified in Installation, Operation and Maintenance Manual.
1. Limit. See Figure 1. A device which automatically interrupts boiler operation when the water
temperature exceeds the set point. Maximum allowable temperature is 240°F (115°C).
Boiler operation is interrupted when system temperature reaches cut-out temperature. Boiler
operation resumes automatically when system temperature falls approximately 15°F (8°C) below
the cut-out temperature. See also Figure 4 for limit sequence of operation.
1A. Limit Control may incorporate a low water cut-off feature that will interrupt boiler operation upon
loss of water in the boiler. If the low water cut-off function is activated to interrupt boiler operation,
follow the instructions TO TURN OFF GAS TO THE APPLIANCE (see Figures 2 & 3) and contact
a qualified service agency.
2. Flame Rollout Switch. See Figure 1. A device which automatically interrupts boiler operation
when flames or excessive heat are present in the combustion area. The control is a single use
device. If the control is activated to interrupt boiler operation, do not attempt to place boiler in
operation. Contact a qualified service agency.
3. Blocked Vent Switch (Vent Safety Shutoff Switch). See Figure 1. A device which automatically
interrupts boiler operation when there is a blockage in the vent pipe or chimney. The control is a
manual reset device. The control is located on the draft hood relief opening. If the control was
activated to interrupt boiler operation, do not attempt to place boiler in operation. Contact a
qualified service agency.
4. Pilot. The pilot provides the ignition source for the main burners. Your boiler has an intermittent
pilot. The intermittent pilot ignites only when there is a call for heat and extinguishes when the call
for heat ends. See Figure 5.
Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut off the gas supply at a location external to the appliance.
Do not use this boiler if any part has been under water. Immediately call a qualified service agency
to inspect the boiler and to replace any part of the control system and any gas control which has
been under water.
En cas de surchauffe ou si l’alimentation ne se coupe pas, ne pas éteindre manuellement ni couper
l’alimentation électrique de la pompe. Couper plutôt l’alimentation en combustible à l’extérieur
de l’appareil.
Ne pas utiliser cette chaudière ni aucune de ses pièces si elles ont été immergées. Contactez
immédiatement une agence d’entretien qualifiée pour inspecter la chaudière et remplacer toute
pièce du système de régulation du débit gazeux et toute commande de gaz ayant été immergée.
CAUTION
Service on this boiler should be undertaken only by trained and skilled personnel from a qualified
service agency.
L’entretien de cette chaudière doit être effectué seulement par des employés qualifiés et
d’expérience appartenant à une société d’entretien reconnue.
WARNING