Carrier Condensing gas furnace Operations Instructions download pdf (Page 31)

the vent or liner manufacturer’s installation instructions. Care must

be taken to prevent the exhaust gases from one appliance from

contaminating the combustion air of other gas appliances.

UNIT MAY NOT OPERATE

Failure to follow this caution may result in intermittent unit

operation.

When vent pipe is exposed to temperatures below freezing,

such as when it passes through an unheated space or when a

chimney is used as a raceway, pipe must be insulated as

shown in Table 10 with Armaflex-type insulation.

Furnace combustion air and vent pipe connections are sized for

2-in. pipe. Any pipe size change should be made outside furnace

casing in vertical pipe. The transition has to be made as close to the

furnace as reasonably possible.

COMBUSTION AIR PIPE

General

Furnace combustion-air connection must be attached as shown in

Fig. 38. Combustion-air intake housing plug may need to be

relocated in some applications.

For Non-Direct Vent (1-Pipe) system, combustion-air must termi-

nate outside of furnace casing with 1 elbow. Orient elbow so that

its opening faces down for upflow or downflow applications.

Orient elbow so that its opening faces sideways (left or right) for

horizontal left or horizontal right applications (See Fig. 35.)

Maintain a 3-in minimum clearance between the opening of the

combustion-air inlet pipe and any object.

UNIT CORROSION HAZARD

Excessive exposure to contaminated combustion air may

result in safety and performance related problems.

Combustion air must not be taken from inside structure

because inside air is frequently contaminated by halogens,

which include fluorides, chlorides, bromides, and iodides.

These elements are found in aerosols, detergents, bleaches,

cleaning solvents, salts, air fresheners, adhesives, paint, and

other household products. Locate combustion-air inlet as far

as possible from swimming pool and swimming pool pump

house.

pipe. Pick the larger of these 2 pipe diameters and use this

diameter for both combustion-air and vent pipes.

NOTE: All pipe joints must have cemented attachment of

combustion-air inlet pipe to inlet housing connection, since it may

be necessary to remove pipe for servicing.

Assembly of Combustion Air Pipe (Non-Direct Vent/1-Pipe

System ONLY)

1. Permanently install perforated disk assembly (factory-

supplied in loose parts bag) in combustion-air elbow using

RTV or by cementing, as shown in Fig. 39. For 120,000 Btuh

size units only: separate the 2 halves of perforated disk

assembly and use only the shouldered disk half.

2. Determine the length of straight portion of combustion-air

inlet pipe from Fig. 39.

3. Cut field-supplied 2-in. diameter PVC pipe to length as

determined per Fig. 39.

4. Permanently attach elbow/perforated disk assembly to straight

portion of pipe using RTV or by cementing as shown in Fig.

39.

Assembly of Combustion Air Pipe (Direct Vent-2-Pipe

System ONLY)

1. Using Table 11, determine the smallest combustion air diam-

eter permitted. Pick the larger diameter and use it for both

combustion and vent pipe.

NOTE: Do not count elbows or pipe sections in terminations or

within furnace (All elbows shown in Fig. 43 and Fig. 44 are not to

be counted).

UNIT MAY NOT OPERATE

Failure to follow this caution may result in incomplete

combusiton, flame disturbance, or flame sense lockout.

When installing combusiton air and vent system of short pipe

length, the smallest allowable pipe diameter must be used.

NOTE: A 2-in. diameter pipe must be used within furnace casing.

Make all pipe diameter transitions outside furnacec casing per Fig.

40.

2. If required per Table 11, insert perforated disk assembly

(factory-supplied in loose parts bag) in intake housing where

combustion air pipe will be connected. If half disk set is

required, install only shouldered disk half.

Attachment of Combustion Air Pipe

1. Determine location of combustion air intake pipe connection

to combustion air intake housing as shown in Fig. 38 for

application.

→ Fig. 38—Combustion-Air and Vent Pipe

Connections

A05092

COMBUSTION-

AIR

COMBUSTION-

AIR

FLOW

VENT

AIR

FLOW

AIR

FLOW

AIR

FLOW

UPFLOW DOWNFLOW

HORIZONTAL-LEFT DISCHARGE HORIZONTAL-RIGHT DISCHARGE

Select 1 vent pipe connection and

1 combustion-air pipe connection.

COMBUSTION

AIR

COMBUSTION-

AIR

COMBUSTION-

AIR

COMBUSTION-

AIR

VENT

NOTE: Select 1 vent pipe connection and

1 combustion-air pipe connection.

NOTE:

* For Non-Direct Vent (1-Pipe) system, orient elbow so that its

opening faces down.

** For Non-Direct Vent (1-Pipe) system, orient elbow so that its

opening faces sideways.

† An external trap kit (see furnace product data sheet) must be use

†

††††

† †

Bottom combustion-air not allowed for non-direct vent

→

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 59 60

Comments to this Manuals

No comments

Carrier Condensing gas furnace Operations Instructions Page 31

Comments to this Manuals

Related products and manuals for Water heaters & boilers Carrier Condensing gas furnace