Bosch Appliances GWH 2400 ES NG manual Fittings or Piping Equivalent Feet, Vent Safety System

Installation instructions

upwards towards termination ¼" for every foot of horizontal length, to prevent the pooling of condensate, and be supported at 4 foot intervals with overhead hangers.

Exception: horizontal run between last elbow and termination must pitch down to termination 1/4" per foot.

Note: For horizontal terminations, venting must terminate once it penetrates to the outside of the structure. There must be no sections of vent pipe exposed to the outdoors.

Note: Listed thimbles or collars are necessary where venting passes through wall and ceiling partitions. If the vent system passes through combustible areas where the vent clearance requirements cannot be maintained, it is permissible to chase straight sections of sealed 3 inch single wall vent through 4 inch (or greater) Type-B vent. The distance to combustibles using this chase technique is 1 inch1). Note: Type-B vent must never be used as the actual exhaust vent system for the appliance, as it is not gas tight and illegal for use with this appliance. This will create a serious health hazard and void the warranty.

3”	Z flex	Protech	Heat Fab
VENTING
3”
Horizontal	2SVSTB03	FSTB3	9390 TEE
Terminal
3” Vertical	2SVSRCF03	FSRC3		5300CI
terminator
Table 3 Terminator Part Numbers
Fittings or Piping		Equivalent
		feet		m
45 degree elbow		1.25		0.38
90 degree elbow		2.5		0.76
pipe per foot		1		0.30

Table 4 Friction Loss Equivalent in piping and fittings

For specific questions concerning vent material, speci- fications, usage or installation, please contact the vent manufacturer directly.

Company	Contact info
Z-flex	www.z-flex.com
	800-654-5600
ProTech Industries	www.protechinfo.com
	800-766-3473
Heat-Fab	www.heatfab.com
	800-772-0739

Table 5 Vent manufacturers

1) in all cases, follow local codes.

Minimum exhaust vent length

Fig. 8

Maximum exhaust vent and combustion air inlet lengths

The maximum exhaust vent and combustion air inlet lengths with one elbow are ≥ 26ft.

Fig. 9 Maximum vent and combustion air lenghts

Note: reduce 2.5 ft for each 90° elbow used after the first one, reduce 1.25 ft for each 45° elbow, see table 2, page 8.

Refer to chapter 3.3.2, page 12 for condensate drain requirements.

Vent Safety System

The GWH 2400 ES will shut down if inadequate exhaust venting is detected or a lack of combustion air is provided to the unit; see troubleshooting section on page 35. See error code to confirm error, correct the problem and then reset the heater before operating.

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