Installation & Operation Manual
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.
Table 1A
Component Materials
Component
Material
Tank
316L Stainless Steel
Coil
316L Stainless Steel
Insulation Polyurethane
Jacket
Polypropylene / ABS
Figure 1-1 Lochinvar SIT DW 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” FPT ON MODELS SIT040DW - 050DW
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
SIT040DW - SIT119DW
PART NO.
“A”
(in.)
“B”
(in.)
“C”
(in.)
“D”
(in.)
“E”
(in.)
“F”
(in.)
SIT040DW
SIT050DW
SIT065DW
SIT080DW
SIT119DW
3 7/16
3 3/8
3 1/8
3 1/8
3 1/8
8 7/8
9 1/4
9 1/4
9 1/2
9 1/2
25 1/8
29 1/4
25 3/8
29 1/4
29 1/4
30 7/8
39 3/8
53
61 1/2
59 7/8
38 1/8
48 3/8
59 3/8
68 7/8
67 5/8
24
24
24
24
28
WEIGHT
FULL OF WATER
(lbs.)
463
581
775
900
1250
2. 1-1/2” MPT ON MODELS SIT065DW - 119DW
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.
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
