15.Slope vent pipe toward furnace a minimum of 1/4 in. per linear ft with no sags between hangers.
16.Use appropriate methods to seal openings where vent pipe passes through roof or sidewall.
D.Extended Exposed Sidewall Pipes
Sidewall vent pipe termination may be extended beyond area shown in Fig. 34 in outside ambient by insulating pipe as indicated in Table 5.
1.Determine vent pipe diameter, as stated above, using total pipe length and number of elbows.
2.Find appropriate temperature for your application and furnace model using winter design temperature (used in load calculations).
3.Determine required insulation thickness for exposed pipe lengths.
NOTE: Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces cannot exceed total allowable pipe length as specified in Table 4.
III.VENT TERMINATION
Vent pipe must terminate either through roof or sidewall. See Table 6 for required clearances. See Fig. 33, 34, and 35 for exterior piping arrangements.
Consideration of the following should be made when determining an appropriate location for termination:
1.Comply with all clearance requirements stated in Table 6.
2.Termination should be positioned where vent vapors will not damage plants/shrubs or air conditioning equipment.
3.Termination should be positioned where it will not be damaged by or subjected to foreign objects such as stones, balls, etc.
4.Termination should be positioned where vent vapors are not objectionable.
IV. MULTIVENTING
When 2 or more 345MAV Furnaces are vented near each other, each furnace must be individually vented. NEVER common vent or breach vent 345MAV furnaces.
CONDENSATE DRAIN
I.GENERAL
Condensate trap is shipped installed in the blower shelf and factory connected for UPFLOW applications. Condensate trap must be RELOCATED for use in DOWNFLOW and HORIZONTAL applications.
Condensate trap MUST be used for all applications.
An external trap is not required when connecting the field drain to this condensate trap.
The field drain connection (condensate trap or drain tube coupling) is sized for 1/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tube connection.
Drain pipe and fittings must conform to ANSI standards and ASTM D1785 or D2846. CPVC or PVC cement and primer must conform to ASTM D2564 or F493. In Canada, use CSA or ULC certified schedule 40 CPVC or PVC drain pipe, fittings, and cement.
When a condensate pump is required, select a pump which is approved for condensing furnace applications. To avoid conden- sate spillage, select a pump with an overflow switch.
Furnace condensate is mildly acidic, typically in the pH range of
3.2to 4.5. Due to corrosive nature of unneutralized condensate, a condensate pH neutralizing filter may be desired. Check with local authorities to determine if a pH neutralizer is required.
Ð29Ð
TABLE 6ÐVENT PIPE
TERMINATION CLEARANCES
| LOCATION | CLEARANCE (FT) |
| U.S.A. | Canada |
| |
| | | |
| Above grade level or above antici- | 1 | 1² |
| pated snow depth |
| | |
| Dryer vent | 3 | 3 |
| From plumbing vent stack | 3 | 3 |
| From any mechanical fresh air intake | 1 | 6 |
| For furnaces with an input capacity of | | |
| 100,000 Btuh or lessÐfrom any non- | | |
| mechanical air supply (windows or | 1 | 1 |
| doors which can be opened) or | | |
| combustion-air opening | | |
| For furnaces with an input capacity | | |
| greater than 100,000 BtuhÐfrom any | | |
| non-mechanical air supply (windows | 1 | 3 |
| or doors which can be opened) or | | |
| combustion-air opening | | |
| From service regulator vent, electric | 4* | 6³ |
| and gas meters, and relief equipment |
| | |
| Above grade when adjacent to public | Note 3 | Note 3 |
| walkway |
| | |
* Horizontal distance.
² 18 in. above roof surface in Canada.
³36 in. to electric meter in Canada only.
NOTES:
1. If installing 2 adjacent 345MAV Furnaces, refer to Multiventing and Vent Terminations section for proper vent configurations.
2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the appliance's own flue products or the flue products of adjacent vents. Recircu- lation can cause poor combustion, inlet condensate problems, and accelerated corrosion of heat exchangers.
3. Vent termination can not terminate less than 2 ft horizontal and 7 ft above public walkway or where condensate vapor or droplets may be a hazard.
II.APPLICATION
The furnace, A/C, and humidifier drains may be combined and drained together. The A/C drain must have an external, field- supplied trap prior to the furnace drain connection. All drain connections (furnace, A/C, or humidifier) must be terminated into an open or vented drain as close to the respective equipment as possible to prevent siphoning of the equipment's drain.
See Fig. 36 for example of possible field drain attachment using 1/2-in. CPVC or PVC tee for vent and A/C or humidifier drain connection.
Outdoor draining of the furnace is permissible if allowed by local codes. Caution should be taken when freezing ambient may freeze drain pipe and prohibit draining.
WARNING: Caution should be taken to prevent drain- ing where slippery conditions may cause personal inju- ries. Excessive condensate draining may cause saturated soil conditions which may result in damage to plants.
III.CONDENSATE DRAIN PROTECTION
Freezing condensate left in condensate trap and drain line may cause cracks, and possible water damage may occur. If freeze protection is required, use condensate freeze protection accessory or equivalent 3 to 6 watt per ft at 120v and 40°F self-regulating, shielded, and waterproof heat tape. See Installation Instructions supplied with accessory or heat tape manufacturer's recommenda- tions.
1.Fold heat tape in half and wrap on itself 3 times.
2.Locate heat tape between sides of condensate trap back. (See Fig. 37.)
3.Use wire ties to secure heat tape in place. Wire ties can be positioned in notches of condensate trap sides. (See Fig. 37.)
