Install Instructions

ManualsBrandsCaleffi ManualsHeating Supplies1" PEX Crimp MIXCAL 3-Way Adjustable Thermostatic and Pressure Balanced Mixing Valve w/ Check Valve & Gauge

Function

The Calefﬁ MixCal™ three-way thermostatic mixing valve is used in systems

producing domestic hot water or in hydronic and radiant heating systems.

It maintains the desired output temperature of the mixed water supplied to

the user at a constant set value compensating for both temperature and

pressure ﬂ uctuations of incoming hot and cold water.

Product range

521A Series Three-way thermostatic mixing valve:

“C” models include inlet check valves “419, 519, 619” models include

outlet gauge adapter. Union thread NPT Male, sizes ½”, ¾”, 1”; Union

sweat, size ½”, ¾”, 1”. Press connection ¾”.

Technical Characteristics

Materials: -Body: low-lead brass (<0.25% Lead content)

-Shutter, seats and sliding guides: PPO

-Springs: Stainless steel

-Seals: EPDM

Suitable ﬂ uids: water, 30% max glycol solution

Setting range (outlet temperature): 85–150°F (30–65°C)

Tolerance: ±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: 120–185°F (49–85°C)

Cold water inlet temperature range: 39–80°F (3.9–26.6°C)

Maximum inlet pressure ratio (H/C or C/H) for optimum performance: 2:1

Minimum temperature difference between hot water inlet and mixed

water outlet for optimum performance: 27ºF (15ºC)

Minimum ﬂ ow rate to ensure optimal performance: 1.3 GPM (5 L/min)

Lay length (¾” press connection), hot to cold inlet: 3

/8”

Maximum ﬂ ow rate: 15 GPM(57 L/min)

Certiﬁ ed to: cUPC listed to ASSE 1017/CSA B125.3

Reduction of Lead in Drinking Water Act compliant: 0.25% Max. weighted

average lead content

Reduction of Lead in Drinking Water Act Certiﬁ ed by IAPMO R&T. Meets

requirements of ANSI/ NSF 372-2011.

MixCal™ adjustable three-way thermostatic mixing valve

521 Series

38476.08

www.caleffi.com

ASSE 1017

Installation, commissioning and service instructions

Summary of content (8 pages)

PAGE 1
38476.08 www.caleffi.com MixCal™ adjustable three-way thermostatic mixing valve 521 Series © Copyright 2015 Caleffi Installation, commissioning and service instructions Function The Caleffi MixCal™ three-way thermostatic mixing valve is used in systems producing domestic hot water or in hydronic and radiant heating systems.
PAGE 2
SAFETY INSTRUCTION This safety alert symbol will be used in this manual to draw attention to safety related instructions. When used, the safety symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD. CAUTION: All work must be preformed by qualified personnel trained in the proper application, installation, and maintenance of systems in accordance with all applicable codes and ordinances.
PAGE 3
COLD HOT TOH DLOC HOT The controlling element of the three-way thermostatic mixing valve is a thermostatic sensor fully immersed in the mixed water outlet tube which, as it expands or contracts, continuously establishes the correct proportion of hot and cold water entering the valve. The regulation of these flows is by means of a piston sliding in a cylinder between the hot and cold water passages.
PAGE 4
Use Caleffi MixCal series 521 thermostatic mixing valves are designed to be installed at the hot water heater. The Caleffi Mix Cal series 521 valve cannot be used for tempering water temperature at fixtures as a point-of-use valve. They are not designed to provide scald protection or anti-chill service. They should not be used where ASSE 1070 devices are required. Wherever a scald protection feature is required, Caleffi series 5213 high performance mixing valve needs to be installed.
PAGE 5
Check valves In order to prevent undersirable backsiphonage, separate check valves should be installed in systems with code “521 A” model thermostatic mixing valves (these models do not contain integral check valves in the hot and cold inlet ports). As a convenience for easier installations, the Caleffi code “521 AC” model series thermostatic mixing valves include integral check valves in the hot and cold inlet ports. NOTE TO INSTALLER: DO NOT TEST FIT OR INSTALL CHECK VALVES BEFORE SOLDERING.
PAGE 6
Temperature adjustment The temperature is set to the required value by means of the knob with a graduated scale, on the top of the valve. Pos. T (ºF) Min. 1 81 2 90 3 100 with: THot = 155ºF (68ºC) 111 . 4 5 120 6 127 138 TCold = 55ºF (13ºC) .
PAGE 7
Radiant panels heating system Replacement fittings 1/2 inch Item Item NPT quantity Description per valve 521400A, AC 521410A, AC 3/4 inch Sweat NPT Sweat 521409A, AC 521500A, AC 521509A, AC 521419A, AC 521510A, AC 521519A, AC 1 inch Press 521506A 521516A NPT Sweat 521600A, AC 521609A, AC 521610A, AC 521619A, AC Union washer 3 Union nut 1" 3 F61008 Male tailpieces 3 R31981 NA10002 31901A NA10003 (2 only – “410”) (2 only – “419”) (2 only – “510”) (2 only – “519”) Inlet male tailpiece with check
PAGE 8
Symptoms Cause Corrective action Hot water at the cold taps a) Operation of check valve is hindered; Check valve is not sealing correctly. - Replace faulty check valve b) Check valves not fitted. Fluctuating mixed water temperature a) Erratic supply temperatures at the inlet of the valve. - Restore inlet conditions within the limits of the valve. b) Starvation of the water supplies at the inlets of the valve. c) Incorrect commissioning of the valve.