Exhaust Venting |
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| Important Notes and Warnings |
This heater is designed to exhaust the products of combus- | • This heater is certified to be installed using Schedule 40 | ||||
tion (flue gases) to the outdoors using a sealed piping sys- | PVC or CPVC plastic vent material. In Canada some | ||||
tem. Table 2 lists the allowable vent materials and sizing | jurisdictions require that this material is approved to | ||||
information. Figure 8 shows the general venting layout while | ULC S636. ULC S636 mandates that components from | ||||
Figures | different systems must not be mixed in the same vent | ||||
clearances. Connection of the venting piping to the blower | runs. Check local codes to determine which materials | ||||
is shown in Figures |
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| are allowed in your area and only use approved materi- |
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| al. All venting material and components must be joined |
Correct installation of the venting system is essential to the | with the approved primer/cleaner and solvent cement. | ||||
safe and efficient operation of this water heater. Vent piping | • Do not common vent this heater with any other appli- | ||||
must be installed in accordance with all applicable local and | ance. | ||||
provincial or state codes. In the absence of such codes, all | • During operation the plastic piping will expand as it | ||||
installation shall meet the requirements as stated in the lat- | heats up and contract as it cools down. This is normal | ||||
est edition of the "Natural Gas and Propane Installation | for this type of venting. Rigidly fastening the vent piping | ||||
Codes" | can cause undue stress that may result in the cracking | ||||
Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.). | or fracturing the vent piping material. A fracture of the | ||||
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| venting pipe poses a serious safety hazard. To prevent |
NOT RECOMMENDED: |
| PREFERRED PRACTICE: | stressing of the vent system, all hangers and supports | ||
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| must allow the vent piping freedom to move. |
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| • Use long sweep elbows wherever possible. Closely- |
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| coupled elbows and short radius elbows can reduce the |
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| venting capacity. |
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| • All power vented water heaters generate a certain |
STREET ELBOW |
| NORMAL ELBOW | amount of operational noise. In order to minimize noise | ||
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| transmission to the support structure, use isolation pads |
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| |
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| between the pipe hangers and the vent pipe. |
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| • Most power vent installations develop some condensa- |
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| tion in the vent piping. When using long runs of venting |
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| 150mm | ||
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| (6 in.) min. |
| or when the venting passes through cold or unheated |
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| areas, considerable amounts of condensate from the |
BACK TO BACK ELBOWS |
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| flue gases can develop. Provision must be made for the |
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| condensate to drain freely from the system or to be col- |
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| lected in a condensate trap(s) that can be drained. |
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| Damage or fracture of the vent piping may occur if the |
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| condensate is allowed to collect and freeze. Pooling of |
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| condensate can restrict airflow and can cause nuisance |
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| failures of the system. |
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| • Be aware of any concealed wiring or piping inside the |
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| walls. |
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| • Ensure sufficient ventilation air to prevent elevated tem- |
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| peratures in closets and ventilated spaces. |
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90° SHORT SWEEP ELBOW | 90° LONG SWEEP ELBOW |
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| (MORE RESTRICTIVE) |
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| (LESS RESTRICTIVE) |
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Figure 6 Pipe Fittings And Practices |
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Note: The information provided in Figure 6 is intended as a |
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guideline for good vent installation practices only and is not |
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intended to restrict venting options beyond those restric- |
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tions established by the latest edition of the "Natural Gas |
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and Propane Installation Codes" | VENT LENGTH LESS THAN OR |
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| VENT LENGTH GREATER THAN 6.1 | |||||||||||||
any applicable local and provincial codes. | EQUAL TO 6.1 EQUIVALENT METRES |
| EQUIVALENT METRES (20 FT.) USE |
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| (20 FT.) USE THIS SCREEN. |
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| THIS SCREEN. |
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| – 11 | Figure 7 Rodent Screens |
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| – |
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