Installation & Operation Manual
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.
Table 1A
Component Materials
Component Material
Tank 316L Steel Stainless Steel
Coil 304L Stainless Steel
Insulation Polyurethane
Jacket Polypropylene / ABS
Figure 1-1 Lochinvar SIT Series Indirect Water Heater
“E”
“A”
“B”
“C”
“D”
22.5°
45°
“F”
1” MPT (SEE NOTE 2)
1” MPT
1” MPT
AQUASTAT/SENSOR WELL
NOTES:
1. 1-1/2” FPT ON MODELS SIT065 - 119 .
1. RELIEF VALVE CONNECTION
2. HOT WATER OUTLET
3. BOILER WATER IN
4. BOILER WATER OUT
5. DRAIN/COLD WATER INLET
5
4
3
3/4” FPT
1
1” FPT (SEE NOTE 1)
2
SIT030 - SIT119
PART NO.
“A”
(in.)
“B”
(in.)
“C”
(in.)
“D”
(in.)
“E”
(in.)
“F”
(in.)
SIT030
SIT040
SIT050
SIT065
SIT080
SIT119
3 1/16
3 1/16
3 5/8
3 5/16
3 5/16
3 5/16
8 3/16
8 3/16
9 1/8
9 1/8
9 1/8
9 3/8
21 3/4
25 1/4
24 7/16
27 15/16
27 15/16
31 11/16
32 1/4
48 1/2
39 3/4
52 1/4
61 3/4
60 1/4
39 1/2
55 9/16
47 1/4
59 7/8
69 3/8
68 3/16
20
20
24
24
24
28
WEIGHT
FULL OF WATER
(lbs.)
393
515
614
820
921
1268
2. 1-1/2” MPT ON MODELS SIT065 - 119 .
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.
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.
4
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