Legend T-45NL User manual

T-45NL & T-46NL
THERMOSTATIC MIXING VALVES
Installation Guide
1
Application
Legend thermostatic mixing valves are designed for applications requiring temperature control, scald
prevention and reduction of thermal shock in domestic potable water distribution (ModelT-45NL)
and radiant heating installations (ModelT-46NL). The three-way thermostatic mixing design permits
controlled water temperatures to individual or multiple fixtures, gang showers or hydronic heating loops.
Before beginning, check your local code requirements. Select the correct model for your application, as it
pertains to at-the-source, individual or multiple fixtures, point-of-use or heating systems applications:
Model T-45NL: Certified in compliance with ASSE 1017, 1069, 1070, and ANSI/NSF 61
Model T-46NL: Certified in compliance with ASSE 1017 and ANSI/NSF 61
CAUTION!
PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING AND OPERATING!
Note: Both models feature optional union-connection types in MNPT, compression, press-t, push-t, PEX barb (F 1807), and sweat:
MNPT COMP PRESS PUSH F 1807 SWEAT

T-45NL & T-46NL
THERMOSTATIC MIXING VALVES
Installation Guide
2
Applications
1. Valves must be installed in an accessible location, to permit adjustment, servicing and cleaning procedures. It is strongly recommended
that ball valves are installed upstream of the hot and cold inlet connections, to allow for the removal and servicing of the mixing valve:
LEGEND
T-45NL
LEGEND T/S-1001NL
BALL VALVE
COLD WATER SUPPLY
Typical domestic water distribution installation:
HOT
MIX
H
H
C
C
C
COLD
WATER
HEATER
Float type Air Vent &
Air Scoop (air purger)
Boiler (Condensing)
Purging/Fill
Valves
System
Circulator Thermometer
Expansion
Tank
3-Way Thermostatic
Mixing Valve (Model T-46NL)
Pressure Differential
Bypass Valve
Radiant Manifold
Radiant Manifold
Typical radiant heating installation:
HOT
MIX
COLD

T-45NL & T-46NL
THERMOSTATIC MIXING VALVES
Installation Guide
3
Installation
1. Select the correct connection types to be used, at each of the three connections: HOT inlet, COLD inlet
and MIX outlet.Verify that the line lengths are correct, to permit union attachment of the valve’s body
to each connection:
2. Install the union nuts onto the tubing or pipe first, in the correct orientation. For copper
press and PEX crimp (F 1807) connections, install onto the tubing in accordance with the tool
manufacturer’s instructions. For threaded pipe, copper tubing sweat, compression and Insta-Loc II™
push-fit connections, apply the correct industry installation practice.
Note: Insta-Loc II™ push-t connections’ insertion depths are as follows: ½” tubing: 15/16” ¾” tubing: 1-1/8”.
3. Verify that the union gaskets are in-place and install the body onto the three union connections.
Tighten the union nuts firmly.
4. Pressurize the system and check for leaks. Leakage at a union connection may occur if the union
nut is over-tightened.
Adjustment: T-45NL
All adjustments should be performed by a licensed, qualified contractor. Adjustments
must be made while the valve is pressurized.
1. Using the forked tool (included) pry upward, at the base of the setting knob until the brass bonnet is
exposed: (See photos A & B)
2. Turn the knob CLOCKWISE to INCREASE the cold water flow to the mixed outlet, LOWERING the
delivered water temperature.Turn the knob COUNTER-CLOCKWISE to INCREASE the hot water
flow to the mixed outlet, RAISING the delivered water temperature. (See photo C)
3. Using a thermometer placed in the water flow, verify the mixed water temperature. Adjust the knob
until the desired temperature is reached.The factory pre-set temperature is 107.6°F
4. Lock the setting by pushing the setting knob downward until it seats.Verify that the knob is locked
into place by attempting to turn it. It should not rotate. (See photo D)
B
A
C
D
COLD
HOT

T-45NL & T-46NL
THERMOSTATIC MIXING VALVES
Installation Guide
4
Adjustment: T-46NL
All adjustments should be performed by a licensed, qualified contractor. Adjustments
must be made while the valve is pressurized.
1. Using a Phillips-head screwdriver, loosen and remove the screw at the top center of the setting knob.
Remove the setting knob. (See photo E)
2. Using a 21 MM wrench or adjustable wrench, loosen the stem locknut by turning it counter-
clockwise at least one complete revolution. (See photo F)
3. Using a 12 MM socket and ratchet, turn the stem CLOCKWISE to INCREASE the cold water flow to
the mixed outlet, LOWERING the delivered water temperature.
Turn the stem COUNTER-CLOCKWISE to INCREASE the hot water flow to the mixed outlet,
RAISING the delivered water temperature. (See photo G)
4. Using a thermometer placed in the water flow, verify the mixed water temperature. Adjust the stem
until the desired temperature is reached.The factory pre-set temperature is 107.6°F
5. Lock the setting by turning the 21 MM stem locknut clockwise, until it’s tightened against the bonnet.
6. Replace the setting knob. Tighten the screw.
E
F
G
COLD
HOT

T-45NL & T-46NL
THERMOSTATIC MIXING VALVES
Installation Guide
5
Operation
When properly installed, under the correct operating parameters and properly adjusted, both models
will operate automatically.
The correct operating parameters must be present:
Factory pre-set: 107.6°F
T-45NL
Temperature adjustment range: 86°F to 120°F
Cold water supply temperature range: 41°F to 68°F
Hot water supply temperature range: 132.8°F to 149°F
Accuracy of mixed water temperature: +/- 3.8°F
Minimum temperature differential between hot supply and MIX outlet: 21.6°F
Supply pressure: Static: 145 psi
Dynamic: 72.5 psi
Maximum allowable imbalance: 2:1 ratio
Minimum flow rate: 0.5 gpm @ 0.8 psi (see note A)
Maximum flow rate: 15 gpm @ 125 psi (see note A)
T-46NL
Temperature adjustment range: 86°F to 130°F
Cold water supply temperature range: 41°F to 68°F
Hot water supply temperature range: 132.8°F to 149°F
Accuracy of mixed water temperature: +/- 3.8°F
Minimum temperature differential between hot supply and MIX outlet: 21.6°F
Supply pressure: Static: 145 psi
Dynamic: 72.5 psi
Maximum allowable imbalance: 2:1 ratio
Minimum flow rate: 0.5 gpm @ 0.8 psi (see note A)
Maximum flow rate: 15 gpm @ 125 psi (see note A)
Note A: Should not be used for valve selection or system sizing. The Cv valve listed on the product
submittal sheet should be used for valve selection.
Maintenance
Annually inspect the unit for any leakage. Correct as necessary. Annually check the mixed temperature
supply. Over time, performance could diminish due to hard water conditions or pipe scale causing
binding of the internal piston. Shut off the water supply and remove the unit by loosening and detaching
the union ends. Inspect the internal waterways. If they’re clogged with debris, it is likely that the unit’s
piston is binding. Immersion and soaking of the unit in the appropriate de-scaling formula should
restore function. DO NOT DISASSEMBLE the unit! If after soaking the unit continues to malfunction,
REPLACE the entire unit.
Questions? Please contact LegendTechnical at 800-752-2082
www.legendvalve.com
866-752-2055
300 N. Opdyke Rd.
Auburn Hills, MI 48326