General recommendations, Max. 6" insulation, Discharge line – Watts LLL40XL User Manual
Page 2: Discharge line cold hot t&p relief valve
Max. 6"
Insulation
Discharge
Line
Discharge Line
Cold
Hot
T&P Relief
Valve
Max.
6"
Insulation
Direct Side Tapping
For External Flue Heaters
Use extra length extension thermostat to
extend into water storage tank.
For Internal Flue Heaters
Use short or standard length thermostat.
Vertical discharge line must be installed with
its direction downward.
For Heaters with Direct Top Tapping
Use standard or extra length extension thermostat.
Max. 6"
(152mm)
Max. 6"
(152mm)
GENERAL RECOMMENDATIONS
For gas, electric or oil-fired storage water heaters between 180,000 to 200,000 BTU/Hr. rating: Use
3
⁄
4
" (20mm) Se-
ries 40 tested under ANSI Z21.22 with ratings as certified and listed by CSA.
For gas or oil-fired storage water heaters between 200,000 and 500,000 BTU/Hr. rating and for compliance with
applicable water heater labeling requirements: Use 1" (25mm) 40 Series tested under ANSI Z21.22 with ratings
as certified and listed by CSA.
For the full range of high capacity temperature and pressure relief valves Series 40, 140, 240, 340 and 342. See ES-
40, 140, 240, 340.
Thermostat
Dimensions (in.)
Inlet X
Length (in.)
CSA
Valve
Outlet
(Below Inlet
Height
Weight Temp. Steam
**ASME Pressure Steam Rating BTU/HR
No.
Model
(in.)
thread)
(Less Thermostat)
Width
Lbs.
Rating BTU/HR
@75psi set pres.
@100psi set pres.
@125psi set pres.
@150psi set pres.
LL40XL
M15
3
⁄
4
M x
3
⁄
4
F
3
1
⁄
2
5
5
⁄
8
2
5
⁄
8
1
1
⁄
2
200,000
777,600
997,600
1,217,600
1,437,600
LLL40XL
M15
3
⁄
4
M x
3
⁄
4
F
5
7
5
⁄
8
2
5
⁄
8
2
200,000
777,600
997,600
1,217,600
1,437,600
LL40XL
M15
1M x 1F
3
6
1
⁄
2
2
3
⁄
4
2
500,000
1,155,000
1,481,000
1,808,000
2,134,000
M= Male
F=Female
**ASME capacities are steam pressure ratings and do not reflect the CSA temperature relieving capacity of the valves for selection purposes.
Temperature and Pressure Relief Valves should be inspected AT LEAST ONCE EVERY THREE YEARS, and
replaced, if necessary, by a licensed plumbing contractor or qualified service technician, to ensure that the product
has not been affected by corrosive water conditions and to ensure that the valve and discharge line have not been
altered or tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components
over time, rendering the valve inoperative. Such conditions can only be detected if the valve and its components
are physically removed and inspected. Do not attempt to conduct an inspection on your own. Contact your plumb-
ing contractor for a re-inspection to assure continuing safety.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
ES-LL/LLL-40XL 0020-2
©Watts Regulator Co., 1999
Printed in U.S.A.
Valve
Ordering Codes
No.
Size
Set @ 125 psi
Set @ 150 psi
LL40XL
3
⁄
4
"
0163800
0163801
LL40XL
1"
0163804
0163805
LLL40XL
3
⁄
4
"
0163802
0163803