Lochinvar SIT119, SIT030 General information, Operating restrictions, Single-wall heat exchanger

1 General information

The Lochinvar SIT series indirect water heater (FIG. 1-1) is designed to generate domestic hot water in conjunction with a hot water boiler using forced boiler water circulation. This indirect water heater consists of a 316L Stainless Steel tank in which a smooth 304L stainless steel coil is located (Table 1A). Boiler water is pumped through the coil and heats the water in the tank. This tank is not intended for use in pool heating applications or for heating any fluid other than water. It is also not intended for use in gravity hot water heating systems.

Operating restrictions:

•Maximum domestic hot water temperature is 194°F.

•Maximum boiler water temperature is 210°F.

•Maximum working pressure for the vessel tank is 150 psig.

Table 1A

Component Materials

Component	Material
Tank	316L Steel Stainless Steel
Coil	304L Stainless Steel
Insulation	Polyurethane
Jacket	Polypropylene / ABS

Installation & Operation Manual

Single-wall heat exchanger

Uniform plumbing code

Single-wall heat exchangers are permitted if they satisfy all of the following requirements --

1.The heat transfer medium is potable water or contains only substances which are recognized as safe by the U.S. Food and Drug Administration.

2.The pressure of the heat transfer medium is maintained less than the normal minimum operating pressure of the potable water system.

3.The equipment is permanently labeled to indicate that only additives recognized as safe by the FDA shall be used in the heat transfer medium.

Other heat exchanger designs may be permitted where approved by the Administrative Authority.

Figure 1-1Lochinvar SIT Series Indirect Water Heater

“F”

PART NO.	“A”	“B”	“C”	“D”	“E”	“F”
	(in.)	(in.)	(in.)	(in.)	(in.)	(in.)
SIT030	3 1/16	8 3/16	21 3/4	32 1/4	39 1/2	20
SIT040	3 1/16	8 3/16	25 1/4	48 1/2	55 9/16	20
SIT050	3 5/8	9 1/8	24 7/16	39 3/4	47 1/4	24
SIT065	3 5/16	9 1/8	27 15/16	52 1/4	59 7/8	24
SIT080	3 5/16	9 1/8	27 15/16	61 3/4	69 3/8	24
SIT119	3 5/16	9 3/8	31 11/16	60 1/4	68 3/16	28

WEIGHT

FULL OF WATER

(lbs.)

393

515

614

820

921

1268

	NOTES:		1. RELIEF VALVE CONNECTION
	1.	1-1/2” FPT ON MODELS SIT065 - 119 .
22.5°	2.	1-1/2” MPT ON MODELS SIT065 - 119 .	2. HOT WATER OUTLET
			3. BOILER WATER IN
	45°		4. BOILER WATER OUT

5. DRAIN/COLD WATER INLET

1” FPT (SEE NOTE 1) 2

		3/4” FPT	1
		1” MPT 3
“E”
“D”		AQUASTAT/SENSOR WELL
	“C”	1” MPT 4
		1” MPT (SEE NOTE 2) 5
		“B”
		“A”

4

SIT030 - SIT119