U.S. Boiler Company PVG3 Installation, Operating And Service Instructions Download

Page: 49 / 68

General.

Inspection and service should be conducted

annually. Turn off electrical power and gas supply while

conducting service or maintenance. Follow instructions

TO TURN OFF GAS TO APPLIANCE. See Figure 22.

CAUTION

Label all wires prior to disconnection when

servicing controls. Wiring errors can cause

improper and dangerous operation. Verify

proper operation after servicing.
ATTENTION. Au moment de l’entretien des

commandes, étiquetez tous les fils avant

de les débrancher. Les erreurs de câblage

peuvent nuire au bon fonctionnement et être

dangereuses.

S’assurer que l’appareil fonctionne adé

quatement une fois l’entretien terminé.

Low water cutoff

(if so equipped).

Probe Type (Annual Service). Probe type LWCO

should be removed once a year, examined and

cleaned of any dirt accumulations to assure proper

operations. Do not attempt to repair mechanisms in the

field. Complete replacement mechanisms, including

necessary gaskets and installation instructions, are

available from the manufacturer.

Vent System.

Inspect for obstructions, soot

accumulation, proper support, and deterioration of pipe,

fittings, and joints.

1. Clean terminal screens. Terminals must be free of

obstruction, undamaged, with screens securely in

place.

2. Terminal and wall thimbles (if used) must be

weathertight. Penetration through wall must prevent

entry of combustion products into building.

3. Pipe must be full round shape, and show no damage

from impact or excessive temperature.

4. Pipe must be supported at minimum five (5) foot

(1.5 m) intervals and must not sag.

5. All vent joints must be secure and watertight.
6. All joints must be secure and airtight. Horizontal

vent tee drain or vertical vent tee drain (if used)

must have minimum 6 inch trap and allow

condensate to flow freely. To Clean:
a. Disconnect drain tube from drain fitting.

b. Flush drain tube with water. Fill trap with water.

c. Securely fasten drain tube to drain fitting,

providing gas-tight and watertight seal.

7. If pipe must be disassembled for removal of

obstructions or resealing of joint, see Section III,

Paragraph C.

Boiler Flue Passages.

Inspect for blockage or soot

accumulation.
1. Remove Main Burners. See Figure 29.

a. Remove front door.
b. Disconnect pilot tubing and pilot lead wires at

the gas valve.

c.  Remove wires to Flame Roll-out Switch.
d.  Remove Burner Access Panel.
e.  Mark location of Main Burner with Pilot Bracket

on gas manifold.

f. Hold Main Burner on throat. Lift front of

burners to clear orifice. Burner which holds pilot

can be removed by lifting the burner adjacent to

its right first.

2. Disconnect Vent Connector and Vent Pipe from

Blower Outlet.

3. Remove Jacket Top Panel.
4. Disconnect the Black and Gray Silicone Tubing

from the Canopy.

WARNING

This boiler must only be serviced and repaired by skilled and experienced service technicians.
If any controls are replaced, they must be replaced with identical models.
Read, understand and follow all the instructions and warnings contained in all the sections of this

manual.
Never jump out or bypass any safety or operating control or component of this boiler.
Read, understand and follow all the instructions and warnings contained in ALL of the component

instruction manuals.
Assure that all safety and operating controls and components are operating properly before placing

the boiler back in service.

Keep boiler area free and clear of combustible materials, gasoline and other flammable vapors and

liquids.
Do not place any obstructions in boiler room that hinder flow of combustion and ventilation air.

XI. SERVICE (continued)