Use and Care Manual

ManualsBrandsRheem ManualsBoilersPrestige 9.9 GPM Propane Liquid High Efficiency Combi Boiler with 199000 BTU

▪ D. TIGHTENING APPLIANCE COLLAR TO EXHAUST VENT AND INTAKE PIPE

WARNING

Vent adaptors are not designed as load-bearing devices, and must not be used to support exhaust vent piping. All vent pipes must be properly

connected, supported, and the exhaust must be pitched a minimum of ¼" per foot back to the boiler to allow drainage of condensate. Failure to

properly support vent piping and follow the information in this statement could result in product damage, severe personal injury, or death.

CAUTION

Failure to provide a minimum total vent length of 14 equivalent feet could result in property damage and improper appliance operation.

This Combi Boiler has a built-in control to limit the exhaust temperature to 149°F (65°C).

As a result, the Combi Boiler can be vented with Schedule 40 PVC.

In high temperature applications, the exhaust temperature can exceed 149°F (65°C).

In that case, you must use Schedule 40 CPVC or Approved Polypropylene (PP) in the USA or Type BHSpecial Gas Vent Class IIB (CPVC) or

Class IC(Polypropylene) that conforms to ULC-S636 in Canada.

a. The equivalent lengths of friction loss in elbows are listed below:

• 5 feet (1.5M) for each additional 3" 90° elbow

• 2.5 feet (.75M) for each additional 3" 45° elbow

• 8 feet (2.4M) for each additional 2" 90° elbow

• 4 feet (1.2M) for each additional 2" 45° elbow

• Some terminations are considered elbows, and deduction should be applied. For example, a turndown 90° or an open T termination should

be considered a 90° elbow.

• For 2" diameter installations, install a reducing coupling in a vertical section of pipe ABOVE the pipe clamp installed on the Boiler. See Figure 8.

b. For example: If the 2" exhaust vent has two 90° elbows and 10 feet of PVC pipe we will calculate: Exhaust Vent Equivalent Length = (2x8) + 10

= 26 feet.

Further, if the 2" intake pipe has one 90° elbow, one 45° elbow, and 10 feet of PVC pipe, the following calculation

applies: Intake Pipe Equivalent Length = 8 + 4 + 10 = 22 feet.

NOTE: The intake pipe and exhaust vent lengths do not have to be of equal length. There is no balancing requirement between intake and exhaust.

PVC Venting

This Combi Boiler is set to "PVC" (factory default). The Combi Boiler will control and maintain the exhaust temperature

below 144°F (62°C) and the Combi Boiler will shut down when the exhaust temperature exceeds 149°F (65°C).

CPVC or Polypropylene(PP) Venting

When you design a high temperature application (the exhaust temperature can exceed 149°F (65°C)),you must use Schedule 40 CPVC or Approved

Polypropylene (PP) in the USA or Type BH Special Gas VentClass IIB (CPVC) or Class IC(Polypropylene) that conforms to ULC-S636 in Canada and

must change theVent Material Setting as follows.

In this case, the Combi Boiler will control and maintain the exhaust temperature below 195°F (90.5°C)and the Combi Boiler will shut down when the

exhaust temperature exceeds 200°F (93°C).

This appliance uses 2" or 3" diameter pipe for exhaust vent and intake pipe. In order to use 2" pipe, it is required to reduce pipe size in a vertical length

of pipe with a reducing coupling (not included). Follow the steps below to install 2" or 3" pipe into the appliance collar. See Figure 7 & 8 for additional

details.

1. Clean and dry the appliance connection. DO NOT use primer or cement on the appliance connection.

2. Tighten the clamps using a screwdriver.

3. Ensure the pipe is secure before continuing installation.

4. For 2" installations, install a reducing coupling in a vertical section of pipe. See Figure 8.