Field Controls MPL-B, WML-C manual Optional Side Wall Venting, OIL Tank, Piping Installation

OPTIONAL SIDE WALL VENTING

Certain WML-C AND MPL-B furnace models are manufactured to be installed as sidewall vented units. Please refer to Direct Venting Instructions, P/N 28888 included with the Vent Kit for details. Sidewall Venting (Direct Venting) requires the use of specific oil burners; the Beckett AFII, or the Riello 40BF. Please refer to Appendix A, Tables A2, and A4.

Note: Sidewall venting requires special attention to combustion air supply. There is no natural draft in the venting system between furnace cycles; therefore, if the indoor pressure is negative relative to the outdoors, the vent terminal becomes a point of infiltration. This could lead to oil odour control problems. This problem is rectified by the use of ducted outdoor air for combustion (semi-sealed combustion), using the Beckett AFII or Riello 40BF oil burner. See Direct Vent Instructions supplied with the Vent Kits.

Table 3: Minimum Chimney Base Temperatures (°F)

Nozzle		Chimney Height (ft.)
	11		20	28	36
Chimney Thermal Resistance < R6
0.50	300		400	535	725
0.65	275		340	430	535
0.70	270		330	405	505
0.75	260		320	380	475
0.85	250		300	355	430
1.00	225		300	365	430
Nozzle		Chimney Height (ft.)
	11		20	28	36
Chimney Thermal Resistance > R6
0.50	185		200	220	250
0.65	175		185	205	220
0.70	175		185	195	215
0.75	175		185	195	210
0.85	165		185	195	205
1.00	165		185	195	205

<- less than, > - greater than

OIL TANK

Oil storage tanks must be selected and installed in compliance with applicable codes; in the United States, NFPA 31, Standard for the Installation of Oil Burning Equipment, Chapter 2. and in Canada, CAN/CSA-B139, Installation Code for Oil Burning Equipment, Section 6. Observe all local codes and by-laws.

In general, the oil tank must be properly supported and remain stable in both empty and full condition. The oil tank must be fitted with vent and supply pipes to the outdoors. Refer to the above- mentioned codes for sizing. The vent pipe must be no less than 1¼ inches I.P.S., and terminate with an appropriate vent cap in a location where it will not be blocked. The fill pipe must be no less than 2 inches I.P.S., and terminate with an appropriate cap in a location where debris will not enter the fill pipe during oil delivery.

If located indoors, the tank should normally be in the lowest level, (cellar, basement, etc.). It must be equipped with a shut-off valve at the tank outlet used for the oil supply. The oil tank must be located as to not block the furnace / room exit pathway. Observe all clearances specified in the above- mentioned codes.

PIPING INSTALLATION

In the United States, NFPA 31, Standard for the Installation of Oil Burning Equipment, Chapter 2.

In Canada, the entire fuel system should be installed in accordance with the requirements of CAN/CSA B139, and local regulations. Use only approved fuel oil tanks piping, fittings and oil filters.

Ensure that all fittings used in a copper oil line system are high quality flare fittings. Do not use compression fittings.

Do not use Teflon tape on any fittings.

Pressurized or gravity feed installations must not exceed 3 PSIG. Pressures greater than 10 PSIG may cause damage to the shaft seal. If the height of the oil stored in a tank above the oil burner exceeds 11½ feet, it may be necessary to use a pressure-regulating device approved for this purpose.

The furnace may be installed with a one- pipe system with gravity feed or lift. The maximum allowable lift on a single line system is 8 feet. Lift should be measured from the bottom (outlet) of the tank, to the inlet of the burner. Sizing a single line system is complex because of the difficulty estimating the pressure drop through each fitting, bend and component in the line. In general, keep single line systems short as possible. The following chart shows the allowable line lengths (horizontal + vertical) for single and two-line oil piping systems. All distances are in feet.

Table 4: Oil Lines

Copper Tubing Oil Line Length (Feet)

Lift	Single-Pipe OD		Two-Pipe OD
(Feet)	3/8”	1/2”	3/8”	1/2”
0	53	100	68	100
1	49	100	65	100
2	45	100	63	100
3	41	100	60	100
4	37	100	58	100
5	33	100	55	100
6	29	100	53	100
7	25	99	50	100
8	21	83	48	100
9	17	68	45	100
10	13	52	42	100
12	- - -	- - -	37	100
14	- - -	- - -	32	100
16	- - -	- - -	27	100
18	- - -	- - -	22	88

In retrofit applications, where an existing oil line system is in place, a vacuum check will help determine the efficacy of the existing oil line system The vacuum in a system should not exceed 6” Hg. for a single pipe system, nor 12” Hg. for a two-pipe system.

NOTE: The oil burner requires the use of a bypass plug when converting from single-pipe to two-pipe oil piping systems. See burner manufacturer’s instructions.

All fuel systems should include an oil filter between the fuel oil storage tank and the oil burner. For best results, install the oil filter as close to the burner as possible. When using an indoor oil tank, the oil filter may be installed at the tank downstream from the shut-off valve. If firing the furnace under the 0.65 gph rate, a 7 to 10 micron line filter should be installed as close to the oil burner as possible.

ELECTRICAL CONNECTIONS

The furnace is listed by the Canadian Standards Association (CSA). It is factory wired and requires minimal field wiring. In the United States, the wiring must be in accordance with the National Fire Protection Association NFPA-70, National Electrical Code, and with local codes and regulations. In Canada, all field wiring should conform to CAN/CSA C22.1 Canadian Electrical Code, Part 1, and by local codes, where they prevail.

The furnace should be wired to a separate and dedicated circuit in the

7 30318 R4 9/9/2005