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User Guide
Viega Hydronic Mixing Block
This document is subject to updates.
For the most current Viega technical
literature please visit www.viega.us.
Viega products are designed to be
installed by licensed and trained
plumbing, mechanical, and electrical
professionals who are familiar with Viega
products and their installation.
Installation by non-professionals may
void Viega LLC's warranty.
Wiring Terminal Block
Pressure/Temperature Sensor
Delivery Fitting (3)
¾" Solder
Connection*
Return Fitting (2)
UG-HC 566234 0720 Hydronic Mixing Block
The Hydronic Mixing Block is a mixing device
and boiler control with a built in circulator and
system controller. The block can provide either
a fixed or reset water temperature via start/
stop or constant fluid circulation. The following
pages outline step-by-step instructions for the
installation, piping/wiring, and programming of
the Hydronic Mixing Block.
CAUTION!
Only suitably qualified individuals with
formal training in electrical and HVAC
controls should attempt the installation of this
equipment. Incorrect wiring and installation
will affect the warranty provided with this unit.
Wiring must be completed in accordance with
the codes and practices applicable to the
jurisdiction for the actual installation.
CAUTION!
The Hydronic Mixing Block is a
microprocessor based controller and
as such is not to be regarded as a safety
(limit) control. Please consult and install the
heating or cooling appliance in accordance
with the manufacturer's recommendations.
*Viega tailpieces may be used in place of solder connections.
Viega tailpieces are available for sale separately. See "Viega
Tailpieces for Use with Hydronic Mixing Block" on page 3
for options.
Display Screen
Adjustment Buttons
Fitting Clip
Supply Fitting (1)
Backplate
¾" Solder
Connection*
Part No 56160
1 of 20
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Table of Contents
Summary of Contents for Viega Hydronic Mixing Block
- Page 1 *Viega tailpieces may be used in place of solder connections. Viega tailpieces are available for sale separately. See “Viega Tailpieces for Use with Hydronic Mixing Block” on page 3 for options. Wiring Terminal Block Display Screen...
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Page 2: Installation
Water can be used as a lubricant on the fitting o-rings and the pressure/ temperature sensor o-ring. Once a Hydronic Mixing Block fitting is fully seated, slide the fitting clip into the groove in the port, securing the fitting to the block. - Page 3 Connecting the Hydronic Mixing Block to the Primary Loop Direction of flow Connect the Supply Fitting (fitting 1) on the Hydronic Mixing Block to the supply tee on Step 3 the primary loop. Connect the Return Fitting (fitting 2) to the return Step 1 piping from the manifold.
- Page 4 Viega Hydronic Mixing Block User Guide Wiring ■ Terminal 1,2 - Thermostat or end switch (terminal 1 and 2 can accept a dry contact or 24v powered contact). Connecting to the Wiring ■ Terminal 3,4 - Outdoor Sensor. Terminal Block ■...
- Page 5 Connect RC terminal on thermostat to terminal 1 on the Hydronic Mixing Block. Connect W terminal on thermostat to terminal 2 on the Hydronic Mixing Block (part number 15118 W terminal is labeled W/E). Thermostat batteries must be installed and working for this configuration.
- Page 6 Connect C from the transformer to C terminal on the thermostat. Connect W terminal on the thermostat to terminal 1 on the Hydronic Mixing Block. Connect C terminal on the thermostat to terminal 2 on the Hydronic Mixing Block. 120 V AC...
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Page 7: Sensor Wiring
Viega Hydronic Mixing Block User Guide Sensor Wiring Connect the Wiring Installing the Outdoor Sensor Wiring The Viega Hydronic Mixing Block includes an Outdoor connection Sensor which provides an accurate measurement for Outdoor of the outdoor temperature. The Outdoor Sensor... - Page 8 Viega Hydronic Mixing Block User Guide 8 of 20 UG-HC 566234 0720 Hydronic Mixing Block...
- Page 9 Viega Hydronic Mixing Block User Guide UG-HC 566234 0720 Hydronic Mixing Block 9 of 20...
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Page 10: Power On Sequence
Viega Hydronic Mixing Block User Guide Power On Sequence When the Hydronic Mixing Block is plugged in, it will go through a power on sequence: ■ The display will show the current firmware version and then verify the valve function by ramping up to 100% and back down to 0%. - Page 11 Viega Hydronic Mixing Block User Guide Circulator Settings ■ OPERATION: ON/OFF — The circulator is turned on/off as demand requires. Default is set to ON/OFF. ■ OPERATION: CONSTANT — The circulator is constantly on and will only be shut off with warm weather shut down (WWSD).
- Page 12 Viega Hydronic Mixing Block User Guide Design Temperature Settings ■ OUT DESIGN — Outdoor temperature used to calculate heat loss. This temperature is based on location and can be obtained from outdoor design charts. Range: -40°F to 70°F Default: 10°F ■...
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Page 13: Boiler Settings
Viega Hydronic Mixing Block User Guide Boiler Settings ■ TYPE: RESET — This setting allows for the boiler to change supply water temperature based on outdoor temperatures. Default is set to: RESET. ■ BOILER DESIGN — The water temperature needed on design day. -
Page 14: Purge Mode
Viega Hydronic Mixing Block User Guide Defaults \ Purge ■ °C OR °F — Select between CELSIUS or FAHRENHEIT. Default: FAHRENHEIT ■ OVERWRITE DEFAULTS — Allows the end user to overwrite the Factory Default Settings with the desired settings. Viega... -
Page 15: Status Screen
■ SYSTEM — The mixed water temperature that the Hydronic Mixing Block supplies. This symbol: ----- present in the field means the sensor is bad or the wire is broken or shorted. - Page 16 °C vs. °F Default: °F OVERWRITE DEFAULTS/ DEFAULTS PURGE RESTORE DEFAULTS PURGE BACK If a power loss occurs, the Hydronic Mixing Block will return to the Factory Default Settings unless they are overwritten. 16 of 20 UG-HC 566234 0720 Hydronic Mixing Block...
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Page 17: Testing The Sensors
Outdoor Sensor surface temperatures above 85°F. ■ Use a thermometer to read the outdoor Plug in the Hydronic Mixing Block. Allow it to temperature. run through its power on sequence and bring Boiler Sensor you to the STATUS screen. - Page 18 Viega Hydronic Mixing Block User Guide Sensor Resistance Chart Temperature Resistance Temperature Resistance °F °C Ω °F °C Ω 490,813 7,334 405,710 6,532 336,606 5,828 280,279 5,210 234,196 4,665 196,358 4,184 165,180 3,760 139,402 3,383 118,018 3,050 100,221 2,754 85,362...
- Page 19 Viega Hydronic Mixing Block User Guide UG-HC 566234 0720 Hydronic Mixing Block 19 of 20...
- Page 20 Viega Hydronic Mixing Block User Guide Viega LLC 585 Interlocken Blvd. Broomfield, CO 80021 Phone (800) 976-9819 www.viega.us UG-HC 566234 0720 Hydronic Mixing Block...
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Do you have a question about the Hydronic Mixing Block and is the answer not in the manual?
Questions and answers
How do you clear boiler protect mode? Couldn’t find anything in manual or online
The Viega Hydronic Mixing Block enters boiler protection mode when the indicator light is Yellow/Green. To clear boiler protection mode, ensure the boiler sensor is functioning properly and that there are no broken or shorted wires. Check and reset any system settings related to temperature control. If necessary, purge the system by navigating to the STATUS screen, selecting DEFAULTS/PURGE, then selecting PURGE and ACTIVATE. If the issue persists, verify proper installation and operation of the boiler and hydronic mixing block.
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