Filters
This unit is not equipped with a filter or rack. A field−pro- vided filter is required for the unit to operate properly. Table 3 lists recommended filter sizes.
A filter must be in place whenever the unit is operating.
TABLE 3
Furnace | Filter Size | |
Cabinet Width | Side Return | Bottom Return |
| ||
|
|
|
17−1/2" | 16 X 25 X 1 (1) | 16 X 25 X 1 (1) |
|
|
|
21" | 16 X 25 X 1 (1) | 20 X 25 X 1 (1) |
|
|
|
24−1/2" | 16 X 25 X 1 (2) | 24 X 25 X 1 (1) |
Duct System
Use
NOTE − Operation of this furnace in heating mode (indoor blower operating at selected heating speed) with an exter- nal static pressure which exceeds 0.5 inches w.c. may re- sult in erratic limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a removable access panel should be installed in the supply air duct. The access panel should be large enough to permit inspection (by reflected light) of the heat exchanger for leaks after the furnace is installed. If present, this access panel must al- ways be in place when the furnace is operating and it must not allow leaks into the supply air duct system.
Return Air Plenum
NOTE − Return air must not be drawn from a room where this furnace, or any other gas−fueled ap- pliance (i.e., water heater), or carbon monoxide− producing device (i.e., wood fireplace) is installed.
When return air is drawn from a room, a negative pres- sure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete com- bustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system.
Return air can be brought in through the bottom or either side of the furnace. If a furnace with bottom return air is installed on a platform, make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame.
Pipe & Fittings Specifications
All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the Ameri- can Society for Testing and Materials (ANSI/ASTM) stan- dards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that ad- versely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratifica- tion, or separation that cannot be removed by stirring. Re- fer to the table 4 for approved piping and fitting materials.
CAUTION
Solvent cements for plastic pipe are flammable liq- uids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes.
TABLE 4
PIPING AND FITTINGS SPECIFICATIONS
PIPE & FITTING MATERIAL | ASTM | |
SPECIFICATION | ||
| ||
|
| |
|
| |
Schedule 40 PVC (Pipe) | D1785 | |
|
| |
Schedule 40 PVC (Cellular Core Pipe) | F891 | |
|
| |
Schedule 40 PVC (Fittings) | D2466 | |
|
| |
Schedule 40 CPVC (Pipe) | F441 | |
|
| |
Schedule 40 CPVC (Fittings) | F438 | |
|
| |
SDR−21 PVC or SDR−26 PVC (Pipe) | D2241 | |
|
| |
SDR−21 CPVC or SDR−26 CPVC (Pipe) | F442 | |
|
| |
Schedule 40 ABS Cellular Core DWV (Pipe) | F628 | |
|
| |
Schedule 40 ABS (Pipe) | D1527 | |
|
| |
Schedule 40 ABS (Fittings) | D2468 | |
|
| |
ABS−DWV (Drain Waste & Vent) | D2661 | |
(Pipe & Fittings) | ||
| ||
|
| |
PVC−DWV (Drain Waste & Vent) | D2665 | |
Pipe & Fittings) | ||
| ||
|
| |
PRIMER & SOLVENT CEMENT | ASTM | |
SPECIFICATION | ||
| ||
|
| |
|
| |
PVC & CPVC Primer | F656 | |
PVC Solvent Cement | D2564 | |
|
| |
CPVC Solvent Cement | F493 | |
|
| |
ABS Solvent Cement | D2235 | |
|
| |
PVC/CPVC/ABS All Purpose Cement For Fit- | D2564, D2235, | |
tings & Pipe of the same material | ||
F493 | ||
| ||
ABS to PVC or CPVC Transition Solvent | D3138 | |
Cement | ||
| ||
|
| |
CANADA PIPE & FITTING & SOLVENT | MARKING | |
CEMENT | ||
| ||
|
| |
|
| |
PVC & CPVC Pipe and Fittings |
| |
|
| |
PVC & CPVC Solvent Cement | ULCS636 | |
| ||
ABS to PVC or CPVC Transition Cement |
|
Page 16
