CALEFFI 523160A, 523168A, 523170A, 523178A, 523177A Installation, Commissioning And Service Instructions

Low Lead High Flow Thermostatic Mixing Valves

5231 Series

NA10341.02

www.caleffi.com

© Copyright 2015 Caleffi

ASSE 1017

Installation, commissioning and service instructions

Function

ASSE 1017 model 5231 series high flow thermostatic mixing valves are
designed to be installed at the hot water heater (point of distribution) and
cannot be used for tempering water temperature at fixtures as a point-of-use
valve. They are not designed to provide scald protection and should not
be used where ASSE 1070 devices are required. Series 5231 thermostatic
mixing valves can also be used for regulating the flow temperature in radiant
panel heating systems, to which it assures a constant and accurate control
with ease of installation.

Product range

5231 series thermostatic mixing valve. Union thread NPT male and
union sweat connections, sizes 1", 1 ¼", 1 ½", 2". Inlet port check valve
assemblies available separately for field installation.

Technical characteristics

Materials: - body: DZR low-lead brass

- shutter: brass

- springs: stainless steel

- seals: EPDM

- check valve extension (field installed): stainless steel

Suitable fluids: water
Max. percentage of glycol: 30% glycol solution
Setting range: see table on page 2
Temperature stability: ±3°F (±2°C)
Max. working pressure (static): 200 psi (14 bar)
Max. working pressure (dynamic): 75 psi (5 bar)
Hot water inlet temperature range: 120–195°F (49–91°C)
Cold water inlet temperature range: 39–80°F (3.9–26.6°C)
Mixed temperature range: 95–150°F (32–66°C)
Max. inlet pressure ratio (H/C or C/H) for optimum performance: 2:1
Min. temperature difference between hot water

inlet and mixed water outlet for optimum performance: 20°F (11°C)
Max. water hardness: 10 grains
Certified to:

1. cUPC listed to ASSE 1017/CSA B125.3 Reduction of Lead in
Drinking Water Act Compliant: 0.25% Max. weighted average
lead content. Certifed by IAPMO R&T.

2. Meets requirements of ANSI/NSF 372 - 2011.

Code Description Flow

523160A 1" Union Thread NPT male 4.4 Cv
523168A 1" Union Sweat 4.4 Cv
523170A 1 ¼" Union Thread NPT male 4.4 Cv
523178A 1 ¼" Union Sweat 4.4 Cv
52317 7A 1 ¼” Union Sweat with outlet temp. gauge 4.4 Cv
523179A 1”, 1 ¼” Replacement body 4.4 Cv
523180A 1 ½” Union Thread NPT male 8.8 Cv
523188A 1 ½” Union Sweat 8.8 Cv
523190A 2” Union Thread NPT male 8.8 Cv
523198A 2” Union Sweat 8.8 Cv
523199A 1 ½”, 2” Replacement body 8.8 Cv

Replacement fitting part numbers

Code Description

Tailpiece

all ports (3)

Inlet Check

Valve

Assembly (2)**

Union

nuts (3)

Gaskets

(3)

523160A

1" Union Thread NPT male

NA10009

NA10366

R31589 R50057

523168A 1" Union Sweat 31554 FD

52 317 0A 1 1/4" Union Thread NPT male R4166 0

52 317 8A 1 1/4" Union Sweat 4178 7 C S T

52 3177A 1 1/4” Union Sweat with outlet temp. gauge*

4178 7 C S T

(2 only)

R31589

(2 only -

177A )

R50057

(2 only -

177A )

523180A 1 1/2” Union Thread NPT male 41371A

NA1037 7 R518 3 8 R50060

523188A 1 1/2” Union Sweat 4178 8 CST

523190A 2” Union Thread NPT male 41372A

523198A 2” Union Sweat 41789 CST

* Replacement outlet mixed temperature gauge adapter complete with outlet tailpiece, union nut and gasket, and

temperature gauge (30-210°F), code NA10315.

**Field installed only

Pos. Min 1 2 3 4 5 6 7 Max

T (°F) 95 104 109 117 122 129 136 142 150
T (°C) 35 40 43 47 50 54 58 61 66

with: T

HOT

= 155°F (68°C) · T

COLD

= 55°F (13°C) · P

INLETS

= 43 psi (3 bar)

Setting the temperature

The temperature is set to the required value by means of the adjustment knob with the graduated
scale on the top of the valve

Principle of Operation

A thermostatic mixing valve mixes hot and cold water in such a way as to maintain a constant set
temperature of the mixed water at the outlet. A thermostatic element is fully immersed into the mixed
water. It then contracts or expands causing movement of the piston, closing either the hot or cold
inlets, regulating the flow rates entering the valve.

If there are variations of temperature or pressure at the inlets, the internal element automatically reacts
attempting to restore the original temperature setting.

Thermal
Shutoff

The Caleffi 5231 series
mixing valves require a
minimum temperature
differential from hot inlet
to mixed water outlet of
20°F (11°C) to ensure
the correct operation,
and maximum pressure
difference between the
hot and cold inlet parts
no greater than 2:1 ratio.
Softened water use is
highly recommended as
the warranty is voided
if used on water with
hardness greater than
10 grains.

Recommended
flowrates for
temperature stability:

Flow curves

10

0.1

1

0.2

0.3

0.5

20

50

p (psi)

10

2

3

5

20

0.1

1

0.2

0.3

0.5

(psi) (bar)

10

2

3

5

20

10

2

5

2

0

0.01

0.1

0.02

0.03

0.05

1.0

0.2

0.3

0.5

4

0.4 0.4

4

0.04

0.4

50

10

0

100

200

1 ¼"

1 ½"

2"

4.4

8.84070

Min.

Max.

(gpm) (gpm)

10

0.1

1

0.2

0.3

0.5

20

50

∆p (psi)

G

(l/min) (

gpm

)

10

2

3

5

20

0.1

1

0.2

0.3

0.5

(psi) (bar)

10

2

3

5

20

10

2

5

2

0

0.01

0.1

0.02

0.03

0.05

1.0

0.2

0.3

0.5

4

0.4 0.4

4

0.04

0.4

50

10

0

100

200

G

(l/min) (

gpm

)

1” 523060A
523068A

1/2” - 3/4”

1”

224

Min.

Max.

(gpm) (gpm)

1" 7

7.6

13

14.2

Cv

1-1/4”

1-1/2”

2”

HOT

MIXED

COLD

.1

0.23

2.3

0.46

0.69

1.15

.3

1

∆p (ft of head)

G

(l/s) (

gpm

)

23

4.6

6.9

11.5

46

0.1

1

0.2

0.3

0.5

(psi) (bar)

10

2

3

5

20

10

2

5

20

0.01

0.1

0.02

0.03

0.05

1.0

0.2

0.3

0.5

9.2

0.92 0.4

4

0.04

0.4

50

100

1.5

3.25

1” 1 1/2” 2”

1 1/4”

 ∆p



50

160

6

10

2.0

5.0

115

172

75

Flow should never exceed standards for pipe size and material.