Patterson-Kelley DVSCM-02 owner manual Exhaust Vent Connection at the Boiler, Flue Gas Termination

Thermific® Gas-Fired Boiler Installation

3.3.3 Exhaust Vent Connection at the Boiler

Pitch toward boiler 1/4" per foot min.

6' Min.

Boot Tee/

135 o Tee

Trap Loop

3" Min.

Condensate Drain

To sewer trap

or condensate pump.

At the outlet of the boiler, an adjustable or fixed length (minimum 2 feet for clearance from inlet duct; maximum 3 feet for proper lift) section may be utilized. This section must be secured to the outlet collar by a minimum of 4 sheet metal screws spaced at approximately 90 degree intervals.

Even though the unit is classified as a Category I boiler (Non-pressurized-non condensing), there are certain abnormal conditions which may cause condensation in the flue vent. Therefore, it is recommended that a tee cover with a drain be provided at the bottom of the boot tee/135º tee. For proper disposal of the condensate, corrosion resistant tubing or plastic tubing should be connected to the drain nipple. Before connecting the tubing to the tee cover nipple, the trap loop must be primed by pouring a small quantity of water into the drain line. The condensate drain line can be routed to a sewer drain trap or pump. Consult the vent manufacturer's instructions for proper installation of drain line.

In transitioning from horizontal to vertical, a double wall boot tee/135º tee must be installed (not a standard tee). If the flue gas exhaust is to be routed through the sidewall, a minimum vertical rise of 6 feet is required

from the outlet of the boot tee/ 135º tee to the inlet of the elbow. In addition, for sidewall venting, it is very important to provide a downward pitch of at least 1/4 inch per foot of run from the termination at the wall toward the boiler for proper drainage of the condensate and for buoyancy assist of the flue gas. Furthermore, do not locate sidewall terminations over area of pedestrian or vehicular traffic due to potential condensate drippage and ice build-up. See Section 3.4 Clearances for more information.

When joining the double wall tubing and fittings, it is important to orient the male end of the section toward the boiler. The female end is positioned away from the boiler towards the vent terminal. Follow the vent manufacturer's instructions for proper installation.

3.3.4 Flue Gas Termination

Centering	Outside Plate
Support	Cover Plate
Plate
	Fastener
	Sealant	Recommended
		termination
		(refer to text).

Sealant

12" Min.

The exhaust vent termination must be a P-K recommended device. There are four approved sidewall terminations:

ƒ90º elbow pointing down, or

ƒTwo 45º elbows pointing down, or

ƒ45º elbow pointing down, or

ƒStandard tee pointing up/down.

Important: The equivalent length of the chosen termination must be included in the calculation of the maximum allowable equivalent length. See Section 3.4.5 for equivalent lengths.

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