Installation Instructions
Blocked Vent Safety Switch
for use by heating contractor
for Vitorond 100, VR1 (oil fired) boilers
Part Number: 7134540, 7134541
Safety and Installation Requirements
Please ensure that these instructions are read and
understood before starting any service work. Failure to
comply with these instructions may cause product/property
damage, severe personal injury and/or loss of life.
Ensure that main power to the equipment being serviced
is off.
Working on the equipment
The installation, adjustment, service and maintenance of
this product must be performed by a licensed professional
heating contractor who is qualified and experienced in
the installation, service, and maintenance of hot water
boilers. There are no user serviceable parts on the boiler,
burner or control.
Take precautions to avoid accidental activation of power
or fuel during service work.
Ensure that the main fuel supply valve to the boiler is
closed.
Do not perform service work on any component part
without ensuring safe operation of the heating system.
When replacing parts, use original Viessmann or
Viessmann approved replacement parts.
Refer to the Installation and Service
Instructions applicable to this boiler.
Product Information
CAUTION
For use with chimney venting only. Do not use in
conjunction with any approved sidewall power venting
or direct vent application. These venting systems will
provide a safety shutdown in case the vent system
becomes blocked.
Installation of a secondary safety switch is required for
oil-fired installations not equipped with a draft hood.
This device is designed to detect flue gas spillage from
a blocked flue system and/or inadequate draft.
For proper placement of blocked vent safety switch see
illustrations below.
IMPORTANT
There may be additional parts supplied in this kit.
Refer to appropriate page for specific instructions on
burner/boiler combination.
Refer to the Installation and Service
Instructions applicable to this boiler.
Recommended placement
of safety switch
5285 847 - 01 06/2014
Not recommended
Installation & Wiring
Blocked Vent Safety Switch Installation
(Vitorond 100 with Beckett (NX, AFG) burner and Honeywell Aquastat, Part No. 7134 540)
1. Disconnect the orange wire of oil primary control of
the burner from the burner motor.
2. Install blocked vent switch (see enclosed Field
Controls WMO-1 Installation Instructions).
3. Run BX cable (armored cable) or any other approved
wire (required by local authority having jurisdiction)
from switch to burner junction box.
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5285 847 - 01
4. Rewire the burner motor through safety switch and
back to orange wire of oil burner primary control (see
page 3).
Blocked Vent Safety Switch Installation
Installation & Wiring
(Beckett burner with GeniSys primary control and Hydrostat)
WARNING
Electric shock hazard. Can cause severe personal injury
or loss of life if power source, including service switch on
boiler, is not disconnected before installing or servicing.
Installations must follow these codes and requirements:
- National Electrical Code (N.E.C.), ANSI/NFPA 70, latest
edition and any additional national, state or local codes.
- In Canada, CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
- CSA B-139 installation code for oil boilers.
- Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C wire
or equivalent must be used. Supply wiring to boiler and
additional control wiring must be 14 ga. or heavier.
- Provide electrical ground at boiler as required by codes.
H All field supplied nominal 120 VAC voltage wiring must
be sheathed in a flexible metal conduit.
Hydrostat
Legend
A Power supply, provide disconnect means
and overload protection as required.
B Control case must be connected to earth
ground. Use grounding provided.
C B1 is a in. tab terminal.
D Circulator
E Temperature limit control (when required
by local jurisdiction)
CAUTION
A field supplied manual reset high limit control must be
installed at the outlet pipe of the boiler to interrupt burner
operation should the factory supplied high limit control
fail. This field supplied high limit control must be set
20° F (7° C) above the setting of the factory supplied
high limit control. The setting of this field supplied high
limit control must never be greater than 220°F (104° C).
IMPORTANT
5285 847 - 01
If burner lock-out occurs, verify blocked vent safety
switch operation first.
3
Installation & Wiring
Blocked Vent Safety Switch Installation
(Vitorond 100 with Riello burner and Hydrostat)
IMPORTANT
CAUTION
There are additional parts supplied in this kit. Refer to
appropriate page for specific instructions on burner/boiler
combination.
For use with chimney venting only. Do not use in
conjunction with sidewall power venting or direct vent
application. These venting systems will provide a safety
shutdown in case the vent system becomes blocked.
Hydrostat
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5285 847 - 01
Legend
A Power supply, provide disconnect means and
overload protection as required.
B Control case must be connected to earth ground.
Use grounding provided.
C B1 is a in. tab terminal.
D Circulator
Blocked Vent Safety Switch Installation
Burner Set-up
WARNING
Electric shock hazard. Can cause severe personal injury
or loss of life if power source, including service switch on
boiler, is not disconnected before installing or servicing.
Electrical connections (with Vitotronic control)
Installations must follow these codes and requirements:
- National Electrical Code (N.E.C.), ANSI/NFPA 70, latest
edition and any additional national, state or local codes.
- In Canada, CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
- CSA B-139 installation code for oil boilers.
- Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C wire
or equivalent must be used. Supply wiring to boiler and
additional control wiring must be 14 ga. or heavier.
- Provide electrical ground at boiler as required by codes.
Burner wiring harness (supplied)
Closed end connectors are factory installed on RED,
ORANGE and BLUE wires. These RED, ORANGE and
BLUE wires may or may not be used in your burner
application. See wiring diagram in this manual which
is specific to your burner application. Do not remove
or cut any of the closed end connectors of the RED,
ORANGE or BLUE wires, unless it is necessary to
do so. RED wire is live (120VAC) at all times. Do
not remove or cut its closed end connector unless
it is necessary to do so. Failure to heed the above
instructions may cause severe personal injury or loss
of life.
Burner wiring harness (supplied)
5285 847 - 01
Legend
BL
OR
BK
WT
GN
RD
Blue
Orange
Black
White
Green / Ground
Red
* If Beckett burner is being installed,
cut this length to 6” for connection
to burner junction box (located
under the burner primary control).
5
Burner Set-up
Blocked Vent Safety Switch Installation
(Beckett burner with GeniSys primary control and Vitotronic control)
WARNING
Electric shock hazard. Can cause severe personal injury
or loss of life if power source, including service switch on
boiler, is not disconnected before installing or servicing.
WARNING
Ensure that the burner cycles ON and OFF on proper call
for heat before leaving the job site. Failure to do so may
lead to boiler runaway situation, which may lead to
property damage, personal injury or death.
Wiring diagram (Vitorond 100 with Beckett burner,
GeniSys control and Vitotronic control)
Installations must follow these codes and requirements:
- National Electrical Code (N.E.C.), ANSI/NFPA 70, latest
edition and any additional national, state or local
codes.
- In Canada, CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
- CSA B-139 installation code for oil boilers.
- Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C wire
or equivalent must be used. Supply wiring to boiler and
additional control wiring must be 14 ga. or heavier.
- Provide electrical ground at boiler as required by codes.
IMPORTANT
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5285 847 - 01
If burner lock-out occurs, verify blocked vent safety
switch operation first.
Blocked Vent Safety Switch Installation
Wiring Diagram
(Vitorond 100 with Riello burner and Vitotronic control)
WARNING
Ensure that the burner cycles ON and OFF on proper call
for heat before leaving the job site. Failure to do so may
lead to boiler runaway situation, which may lead to property damage, personal injury or death.
WARNING
Electric shock hazard. Can cause severe personal injury
or loss of life if power source, including service switch on
boiler, is not disconnected before installing or servicing.
Installations must follow these codes and requirements:
- National Electrical Code (N.E.C.), ANSI/NFPA 70, latest
edition and any additional national, state or local codes.
- In Canada, CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
- CSA B-139 installation code for oil boilers.
- Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C wire
or equivalent must be used. Supply wiring to boiler and
additional control wiring must be 14 ga. or heavier.
- Provide electrical ground at boiler as required by codes.
WARNING
5285 847 - 01
RED wire not used in this application. DO NOT cut or remove closed end connector from the wire. (Live 120VAC
at all times).
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5285 847 - 01
Technical information subject to change without notice.
Printed on environmentally friendly
(recycled and recyclable) paper.
Blocked Vent Safety Switch Installation