Lochinvar 497 - 2067 service manual B, Combustion and Ventilation Air, Determine unit location

Installation & Service Manual

1 Determine unit location

Freeze Protection for a Heating Boiler System (if required)

WARNING	Do not use undiluted or automotive type
	anti-freeze.

1.Use only properly diluted inhibited glycol anti-freezedesignedforhydronicsystems.Inhibited propyleneglycolisrecommendedforsystemswhere incidental contact with drinking water is possible.

2.A solution of 50% antifreeze will provide maximum protection of approximately -30°F.

3.Follow the instructions from the antifreeze manufacturer. Quantity of antifreeze required is based on total system volume including expansion tank volume.

4.Glycol is denser than water and changes

the viscosity of the system. The addition of glycol will decrease heat transfer and increase frictional loss in the boiler and related piping. A larger pump with more capacity (15% to 25% more) may be required

to maintain desired flow	rates and
prevent a noise problem in a	glycol system.

Combustion and Ventilation Air

Provisions for combustion and ventilation air must be in accordance with Section 5.3, Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA-B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

Provide properly-sized openings to the equipment room to assure adequate combustion air and proper ventilation when the unit is installed with conventional venting or sidewall venting.

*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase in the net free area to supply adequate combustion air for all appliances.

5.Local codes may require a back flow preventer or actual disconnect from city water supply when antifreeze is added to the system.

TABLE 1B

MINIMUM RECOMMENDED COMBUSTION

AIR SUPPLY TO EQUIPMENT ROOM

	*Outside Air from			Inside Air from		Inside Air from
Model	2 Openings Directly from		*Outside Air from	2 Ducts Delivered from		2 Ducts Delivered from Interior
	Outdoors		1 Opening Directly	Outdoors		Space
Number
	Top	Bottom	from Outdoors, in2	Top	Bottom	Top	Bottom
	Opening, in2	Opening, in2		Opening, in2	Opening, in2	Opening, in2	Opening, in2
497	125	125	167	250	250	500	500
	(806 cm2)	(806 cm2)	(1077 cm2)	(1613 cm2)	(1613 cm2)	(3226 cm2)	(3226 cm2)
647	163	163	217	325	325	650	650
	(1052 cm2)	(1052 cm2)	(1400 cm2)	(2097 cm2)	(2097 cm2)	(4194 cm2)	(4194 cm2)
747	188	188	250	375	375	750	750
	(1213 cm2)	(1213 cm2)	(1613 cm2)	(2420 cm2)	(2420 cm2)	(4839 cm2)	(4839 cm2)
987	248	248	330	495	495	990	990
	(1600 cm2)	(1600 cm2)	(2129 cm2)	(3194 cm2)	(3194 cm2)	(6388 cm2)	(6388 cm2)
1257	315	315	420	630	630	1260	1260
	(2032 cm2)	(2032 cm2)	(2710 cm2)	(4065 cm2)	(4065 cm2)	(8130 cm2)	(8130 cm2)
1437	360	360	480	720	720	1440	1440
	(2323 cm2)	(2323 cm2)	(3097 cm2)	(4646 cm2)	(4646 cm2)	(9291 cm2)	(9291 cm2)
1797	450	450	600	900	900	1800	1800
	(2903 cm2)	(2903 cm2)	(3871 cm2)	(5807 cm2)	(5807 cm2)	(11614 cm2)	(11614 cm2)
2067	518	518	690	1035	1035	2070	2070
	(3342 cm2)	(3342 cm2)	(4452 cm2)	(6678 cm2)	(6678 cm2)	(13356 cm2)	(13356 cm2)

12