Table of Contents
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1
General information
The Lochinvar SIT DW 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 316L 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
Tank
Coil
Insulation
Jacket
Figure 1-1 Lochinvar SIT DW Series Indirect Water Heater
"E"
"D"
"C"
"B"
"A"
4
Material
316L Stainless Steel
316L Stainless Steel
Polyurethane
Polypropylene / ABS
PART NO.
"F"
SIT040DW
SIT050DW
SIT065DW
SIT080DW
SIT119DW
NOTES:
1. 1" FPT ON MODELS SIT040DW - 050DW
22.5°
2. 1-1/2" MPT ON MODELS SIT065DW - 119DW
45°
1" FPT (SEE NOTE 1) 2
3/4" FPT 1
1" MPT
3
AQUASTAT/SENSOR WELL
1" MPT
4
1" MPT (SEE NOTE 2)
Installation & Operation Manual
Double-wall heat exchanger
Uniform plumbing code
Heat exchangers used for heat transfer or heat recovery shall be
separated from the potable water by a double-wall construction
with a space open to the atmosphere between the two (2) walls.
"A"
"B"
"C"
(in.)
(in.)
(in.)
8 7/8
3 7/16
25 1/8
3 3/8
9 1/4
25 3/8
3 1/8
9 1/4
29 1/4
29 1/4
3 1/8
9 1/2
3 1/8
9 1/2
29 1/4
5
SIT040DW - SIT119DW
WEIGHT
"D"
"E"
"F"
FULL OF WATER
(in.)
(in.)
(in.)
(lbs.)
24
30 7/8
38 1/8
463
48 3/8
39 3/8
24
581
59 3/8
775
53
24
61 1/2
68 7/8
24
900
59 7/8
67 5/8
28
1250
1. RELIEF VALVE CONNECTION
2. HOT WATER OUTLET
3. BOILER WATER IN
4. BOILER WATER OUT
5. DRAIN/COLD WATER INLET
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