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1 General Information
The Lochinvar SDT/SET series indirect water heater
(FIG. 1-1) is designed to generate domestic hot water in
conjunction with a solar panel using forced circulation with a
backup heat source. This indirect water heater consists of a
316L Stainless Steel tank in which a smooth 304L stainless
steel coil is located (Table 1A). Solar heating fluid is pumped
through the coil and heats the water in the tank. If the solar
panel cannot produce enough heat, the backup source should
supply hot water. 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
Ta nk 316L Steel Stainless Steel
Coil 304L Stainless Steel
Insulation Polyurethane
Jacket ABS
Figure 1-1 Lochinvar SDT and SET Series Indirect Water Heaters
PART NO.
“A”
(in.)
“G”
(in.)
“F”
(in.)
“E”
(in.)
“D”
(in.)
“C”
(in.)
“B”
(in.)
“I”
(in.)
“H”
(in.)
SDT065
SET119
SET090
SET065
SDT119
SDT080
3 5/16
3 5/16
3 5/16
3 5/16
3 5/16
3 5/16
9 1/8
9 3/8
9 1/8
9 1/8
9 3/8
9 1/8
27 15/16
27 15/16
27 15/16
27 15/16
31 11/16
31 11/16
33 5/8
N/A
37 7/16
40 3/16
N/A
N/A
N/A
N/A
N/A
47 3/16
54 1/2
53 3/4
52 5/16
61 13/16
61 13/16
52 5/16
60 1/8
60 1/8
59 7/8
69 3/8
59 7/8
68 3/16
69 3/8
68 3/16
59 7/8
59 7/8
59 7/8
N/A
N/A
N/A
24
24
28
24
24
28
921
820
1268
921
820
1268
1. RELIEF VALVE CONNECTION
2. HOT WATER OUTLET
3. BOILER WATER IN
4. BOILER WATER OUT
5. DRAIN / COLD WATER INLET
6. SOLAR WATER IN
7. SOLAR WATER OUT
8. ELEMENT
“I”
“I”
22.5
o
45
o
SOLAR ELECTRIC
SOLAR DUAL
COIL
2
5
7
6
8
1
5
7
6
8
3
1
2
1 - 1/2” FPT
1 - 1/2” FPT
1 - 1/2” MPT
1 - 1/2” MPT
AQUASTAT WELL
SOLAR SENSOR
SOLAR SENSOR
3/4” FPT
3/4” FPT
1” MPT
1” MPT
1” MPT
1” MPT
1” MPT
1” MPT
WEIGHT
FULL OF WATER
(LBS)
22.5
o
45
o
“A”
“B”
“C”
“H”
“F”
“G”
“A”
“B”
“C”
“D”
“E”
“F”
“G”
1” MPSF
Single-Wall Heat Exchanger
National Standard Plumbing Code
Single-wall heat exchangers in water heaters comply with the
National Standard Plumbing Code provided that:
• boiler water (including additives) is practically non-toxic,
having a toxicity rating or class of 1, as listed in Clinical
Toxicology of Commercial Products, and
• boiler water pressure is limited to a maximum of 30 psig by
approved relief valve.
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.
SDT/SET Installation & Operation Manual
4