Bosch WR430-7K - Manuel (Page 10)

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Bosch POWER VENTING SYSTEM
VENT INSTALLATION (continued)
6. Support venting duct with plumber’s strap (supplied by installer). Solid piping need only be supported every
four feet. All horizontal pipe joints must be secured with a minimum of four screws per joint. (See Figure 3)
7. All runs through unheated spaces must be wrapped and insulated with a minimum of 1” insulation.
OPERATION AND CHECKING THE DRAFT
A. Place Bosch appliance into operation. Follow lighting pilot and operating instructions on Bosch
cover.
1. Draw water continuously to activate appliance which will turn on gas burner.
2. CHECKING THE DRAFT. Operate the appliance with cover in place for a minimum of five minutes and
check for proper venting, and assure that the combustion products are venting properly, by passing a
lighted match flame or smoke taper over the top edge of the Bosch cover and towards draft hood. If the
vent is drawing properly, the smoke or match flame will be drawn over the top edge of the Bosch cover
and into the draft hood or opening. (see drawing below Checking The Draft)
NOTE: If smoke is not drawn in then the combustion products are
escaping from the relief opening into the room. Under these
conditions, the equipment shall not be operated until proper
adjustments or repairs are made to provide adequate draft.
3. Check draft spill safety switch by obstructing outside vent terminal and by drawing water. Spill switch
should trip and shut off gas supply to Bosch unit. Remove outside obstruction.
4. If spill switch trips allow 5 minutes to reset.
CHECKING THE DRAFT
Figure 3
Vent support hangers (plumber's
strapping) should be 4 ft. apart on
horizontal runs.
All joints must be sealed with high temperature silicone
and high temperature aluminum vent pipe tape
RIGID PIPE
positive pressure
All clamped joints on the positive
side of the power venter are to
be sealed with high temperature
silicone.
Use 4 screws
per joint