Viessmann Vitocrossal 300 CU3A User guide

A
pp
lication Guid
e
Vitocrossal 300,
C
U3A
R
es
id
ent
i
a
l
B
o
il
e
r

II

III
Application Guide
The application examples contained in this document serve as a guideline only.
These are not engineered drawings and are not intended to replace project
designs provided by a professional engineer. It is the responsibility of the
installing contractor to ensure all aspects of the system comply with the local
authorities having jurisdiction.
© 2019 by Viessmann. All rights reserved
.
No part o
f
this book may be used or reproduced in an
y
manner w
h
atsoever w
i
t
h
out pr
i
or wr
i
tten perm
i
ss
i
on
.
For in
f
ormation, contact:
Viessmann Manufacturing Company Inc
.
750
M
c
M
urray
R
oa
d
Waterloo ON, N2V 2G5, Canad
a
P
hone: 519-885-6300
T
o
ll
F
ree: 800-387-7373
www.v
i
essmann.ca

IV

1
Each day Viessmann heating systems
face a wide variety of requirements
and challenges here in North Ameri-
ca, and around the world. Whether in
historically protected homes, modern
commercial buildings, or in large facil-
ities, Viessmann products meet every
demand and offer solutions for all your
needs: wood, oil, or gas fired boilers
for both residential and commercial
use, from 12KBTU to 17.9MMBH (4 to
5263kW), domestic hot water storage
tanks, solar collectors, Biogas technol-
ogies, and much more.
Viessmann also sets the standard
for operational reliability, operating
comfort, environmental friendliness
and a long service life. All Viessmann
products have one thing in common:
they are based on a modular
technology strategy with one common
platform. This way, different product
versions can be created to fulfill each
customer’s specific requirements. In
short, Viessmann takes care of all your
needs, from start to finish.
Part of that is a comprehensive sup-
port program: A knowledgeable Viess-
mann sales representative network,
technical training academy, and
technical support personnel assist
you right from the planning stage
through to the installation and start-
up phase of a project.
With Viessmann you are witnessing
intelligent, high-tech boiler technology
at work. We have selected some of
the most interesting Viessmann appli-
cations from across North America for
your reference.
Pre-Face / Overview

2
AH2 ... ... ...B
Fuel Types
Efficiency
Low Temperature A F
Condensing B J
CHP C
Gas Oil
Generation of Boiler
C
onsecutive Number
A B C ...
Heat Only Circuit Combi Combi Comfort Coiled Tubing Tank Stratified Loading tank Solar Heating For DHW Solar Heating
Wall-Mounted GHJ K - L - -
Floor Standing -R- - S T U V
Series P
Segment 100 1
200 2
300 3
Identifying Boiler Nomenclature
I
I
d
entif
y
in
g
Boiler Nomenclatur
e
Identifying Boiler Nomenclature

3
X2VD 2ZC ZP 01I2
Number of boilers in system Number of heating circuits
1, 2, 3 ...
Number of individual zones in system
Drawing version
How system is zoned
ZP Pumps
ZV Zone Valves
TV Thermostatic Radiator Valves
C Combination
Type of Circuits:
HC Heating Circuit
ZC Zone Circuit
HC/ZC Combination System
Boiler Segment
VD Vitodens
CU
CM Vitocrossal
CT
VR Vitorond
Segment / Series
1100 Series
2200 Series
3 300 Series
Domestic Capability
XNo DHW
IWith indirect DHW
C On demand DHW
T Stratified Loading Tank
Identifying Boiler NomenclatureIdentif
y
in
g
Boiler Nomenclatur
e
Identifying Application Codes

4
Medium
120 -160 °F
Low
80 -120 °F
High
160 -190 °F
Medium
140 -160 °F
High
160 -190 °F
11
2
2
11
Medium
120 -180 °F
Re
f
er to
T
echnical Data Manual of each product for applicabl
e
certi
f
ications.
T
echnical information subject to change without not
T
T
ice.
Best Choice
Possible with limitations
Not recommended
1- Limited maximum boiler supply water temperature.
2- Ensure boiler protection to prevent against low return water temperature
Baseboard / Fan Coil
Cast Iron Radiator
Panel Radiator
Radiant Floor Heating
Indirect DHW
Air Handlers
Vitodens
100
Vitodens
200/222-F
Vitorond
100
Vitocrossal
300 CU3A
Typical Supply
Temperature
Application
Recommended Product Applications

5
Vitrocrossal CU3A Ball valve Circulator with isolation flanges Aquastat Secondary low water cut-off
Low loss header Thermostatic mixing valve Radiant infloor manifold Motorized mixing valve Outdoor temperature sensor
Panel radiator Flow check valve Hot water baseboard radiator Thermostat Temperature sensor
Boiler water feed with double back
check valve
Air eliminator Expansion tank Viessmann Vitotrol Multi-zone control
Purge assembly:
(sediment faucet and ball valve)
Zone valve Hydronic air handler 24V Zone valve Circulator
Towel radiator Viessmann 3-way mixing valve
with actuator motor
Plate and frame heat exchanger 120 volt power
Hydronic Components Electrical Components
Component Index

6
6
6
6
6
6
6
6
6

7
Vitocrossal CU3A
Application # Application Code Page
Application 1 CU3X 1ZC1ZP.01 18
Application 2 CU3I 1ZC4ZV.01 22
Application 3 CU3I 1ZC4ZP.01 26
Application 4 CU3I 2ZC2ZP.01 30
Application 5 CU3I 3HC/ZC3ZP.01 34
Application 6 CU3I 3HC/ZC3ZP.02 38
Application 7 CU3I 3ZC9C.01 42
Application 8 2CU3I 3HC/ZC3ZP.01 46
Application 9 2CU3X 3HC3ZP.01 50
Application 10 4CU3I 2HC2P.01 54

8
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Product Information
Vitocrossal CU3A, Technical Data
Boiler Efficiency In %
System Partial Load In %
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
0 30 40 50 60 70 80 90 100
Design
Supply / Return
40ºC 30ºC
104ºF 86ºF
Curve 0.5
Design
Supply / Return
75ºC 60ºC
167ºF 140ºF
Curve 1.4
Design
Supply / Return
90ºC 70ºC
194ºF 158ºF
Curve 1.8
Boiler Water Or
Supply Temperature
Outdoor Temperature
Room Set Point Temp
Slope
110
100
90
80
70
60
50
40
30
230
212
194
176
158
140
122
104
86
15 10 5 0 -5 -10 -15 -20 -25 -30
50 41 32 23 14 5 -4 -13 -22
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0
35 30 25 20 15 10 5
95 86 77 68 60 50 41
ºF ºC
ºC
ºF

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Product Information
Vitocrossal CU3A, Technical Data

10
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Boiler Dimensions - Models 300 CU3A 26 to 199
Vitocrossal CU3A, Technical Data

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Considerations
Vitocrossal CU3A, Technical Data

15
Power
Pump
Mixing
Module
Supply
Sensor
Comm. Bus
On Boiler
145
145
2
17
52
20
not used
40A
40
Notes/Comments
1. When multiple 145 communication
accessories are being installed, 145
cables will need to be run from device to
device. (Daisy Chain)
2. Ensure to set the S1 switch to assign
the mixing valve heating circuit.
Product Information
Wiring a Mixing Valve Extension Module

16
Zone Control Wizard Setup
Notes/Comments
1. Power Boiler ON
2. Setting of Time and Date
3. Press Menu+OK buttons to access
Service Menu
4. Down Arrow to Service Functions
5. Press OK
6. Activate Yes/No
7. Arrow up to YES
8. Press OK
Select number of ZC circuits 1, 2 or 3
System with 1 Zone Circuit
ZC2 and ZC3 Configuration Setup
Press OK at each
screen to enter
setting and move
to next step
Vitocrossal CU3A, Technical Data