NCB-E Series Application Drawings
Transcript of NCB-E Series Application Drawings
These drawing are intended as a guide only and not as a replacement for professionally engineered project drawings. These concept system drawings do not imply compliance with local building codes. Actual installations may vary depending on installation location & parameters and it must be done in accordance with all local building codes. Verify with
Guide Only
NCB-E Series Application Drawings
20 GoodyearIrvine, CA 92618
800-519-8794www.Navien.com
T
Check Valve Circulator
PressureReliefValve
ExpansionTank
Aquastat
Full-portBall Valve
MixingValve
DHW Circulatorw/Aquastat & Check Valve
BackflowPreventor
AirElimination
NCB-240EASME
HGas D
omes
tic
Hea
ting
S R C
NCB-210EASME
HGas D
omes
tic
Hea
ting
S R C
NCB-180EASME
HGas D
omes
tic
Hea
ting
S R C HGas D
omes
tic
Hea
ting
S R C
NCB-150EASME
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-AHU-BF01
Air Elimination
Zone Valve
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
AIRFLOW
Opt. AC COIL
NCB-E Series Combi-Boiler
Installation Notes:
1. 100' Total Maximum Boiler-Side
Piping Connection Length Allowed.
(NCB-E Circulator-Sp 3, High)
2. Boiler-Side Pipe Length Exceeding
100' Total or a 50MBTUH Coil Output
or More Requires Primary/Secondary
Piping Configuration with Separate
System Circulator.
3. Air Handlers with Internal or External
Circulator Requires Crossover Pipe at
A/H Unit or CH Unit to Complete
Primary/Secondary Configuration*.
* See Drawing NCB-E-AHU-P-BF01
Navien NCB-E Combi Boiler Application
with Air Handler - Direct Connection
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-AHU-P-BF01
Air Elimination
Zone Valve
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
AIRFLOW
Opt. AC COIL
Navien NCB-E Combi-Boiler Application
Air Handler with Internal/External Pump
NCB-E Series Combi-Boiler
Installation Notes:
1. 200' Total Maximum Boiler-Side
Piping Connection Length Allowed.
(NCB-E Circulator-Sp 3, High)
2. Boiler-Side Pipe Length Exceeding
200' Total or a 50MBTUH Coil Output
or More Requires Primary/Secondary
Piping Configuration (A) with A/H
connection the tertiary secondary.
(A)
Optional
Circulator
Location
Do
me
stic
He
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g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NCBQuik4-BF01
Air Elimination
Zone Valve
Navien NCB-E Combi Boiler
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
Single System Circulator with AHU Shown
NCB-E Series Combi-Boiler
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien NCB Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCBT
Circ
Panel
AIRFLOW
Opt. AC COIL
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NCBQuik4-IC-BF01
Air Elimination
Zone ValveNavien NCB-E Combi Boiler- AHU Int. Circulator
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
NCB-E Series Combi-Boiler
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
T
AIRFLOW
Opt. AC COIL
Do
me
stic
He
atin
g
Refer to AHU, Thermostat and Navien
Wiring Supplement Instructions
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NCBQuik1-BF01
Air Elimination
Zone Valve
Navien NCB-E Combi Boiler
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
Single System Circulator Shown
NCB-E Series Combi-Boiler
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien NCB Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
T
Circ
Panel
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-1P-BF01
Air Elimination
Zone Valve
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Single Circulator Zone ApplicationPurge
Valve
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
6" Min
12" Max
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien CH Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
T
Circ
Panel
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NCBQuik3-BF01
Air Elimination
Zone Valve
Navien NCB-E Combi Boiler
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
Multiple System Zone Valves Shown
NCB-E Series Combi-Boiler
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien NCB Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
Circ
Panel
T T T
120 to 24VAC
Transformer
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-3P-BF01
Air Elimination
Zone Valve
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Single Circulator with Multiple Zone Valves ShownPurge
Valve
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
6" Min
12" Max
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien CH Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
Circ
Panel
T T T
120 to 24VAC
Transformer
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NCBQuik2-BF01
Air Elimination
Zone Valve
Navien NCB-E Combi Boiler
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
Multiple System Circulators Shown
NCB-E Series Combi-Boiler
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Circ Zone
Panel
T T TField Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien NCB Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Purge
Valve
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-3P-BF01
Air Elimination
Zone Valve
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Multiple Zone Circulators Shown
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
6" Min
12" Max
Circ Zone
Panel
T T T
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien CH Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
System Return
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Purge
Valve
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-3P-1LT-BF01
Air Elimination
Zone Valve
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Multiple Zone Circulators
Low Temperature Zone Shown
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat
Calls Wired to Navien CH Unit T & T
Terminals To Activate Heat Mode
DIP Sw 7 of 8 Down (OFF) on PCB
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
6" Min
12" Max
Circ Zone
Panel
T T T
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Wye Strainer
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-CI-2PDR-BF01
Air Elimination
Dirt Separator
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Two-Pipe Direct Return
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
T
Circ
Panel
or
Cast Iron Baseboard
Cast Iron Fin Tube
Cast Iron Radiators
or
Proper dirt separation must be used when applying the Navien NCB/NHB boiler with
systems that contain ferrous or ferric materials.
Installation requires proper means of cleaning and flushing system piping prior to
start-up to avoid potentiality subjecting the NCB/NHB boiler to system contaminants.
Proper air elimination & system maintenance is required to maintain Navien warranties.
Dirt SeparatorWYE Strainer w/
Blowdown
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Do
me
stic
He
atin
g
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat Calls Wired to Navien CH Unit
T & T Terminals To Activate Heat Mode DIP Sw 7 of 8 Down (OFF) on PCB
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Wye Strainer
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-CI-2P-RR-BF01
Air Elimination
Dirt Separator
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
Two-Pipe Reverse Return
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat Calls Wired to Navien CH Unit
T & T Terminals To Activate Heat Mode DIP Sw 7 of 8 Down (OFF) on PCB
Proper dirt separation must be used when applying the Navien NCB/NHB boiler with
systems that contain ferrous or ferric materials.
Installation requires proper means of cleaning and flushing system piping prior to
start-up to avoid potentiality subjecting the NCB/NHB boiler to system contaminants.
Proper air elimination & system maintenance is required to maintain Navien warranties.
Dirt SeparatorWYE Strainer w/
Blowdown
T
Circ
Panel
or
Cast Iron Baseboard
Cast Iron Fin Tube
Cast Iron Radiators
or
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: BF February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Wye Strainer
Full-port
Ball Valve
Monoflo
Tee
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-CI-PM-MONO-BF01
Air Elimination
Dirt Separator
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
One-Pipe (Monoflo) Distribution System
With NCB Quik-Install Manifold Kit
Part # GFFM-MCOZUS-001
or
Cast Iron Baseboard
Cast Iron Fin Tube
Cast Iron Radiators
or
Proper dirt separation must be used when applying the Navien NCB/NHB boiler with
systems that contain ferrous or ferric materials.
Installation requires proper means of cleaning and flushing system piping prior to
start-up to avoid potentiality subjecting the NHB/NCB boiler to system contaminants.
Proper air elimination & system maintenance is required to maintain Navien warranties.
Dirt SeparatorWYE Strainer w/
Blowdown
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
Do
me
stic
He
atin
g
Field Supplied Circulator Zone Panel
Shall have Dry Contacts Closed On Heat Calls Wired to Navien CH Unit
T & T Terminals To Activate Heat Mode DIP Sw 7 of 8 Down (OFF) on PCB
T
Circ
Panel
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-DHWR-BF01
Air Elimination
Solenoid
Valve
NCB-E Series Combi-Boiler
Navien NCB-E Combi-Boiler Application
DHW Recirculation Shown
S
Gas
Hydronic
Feed
Water
Domestic Hot Water
Domestic Cold Water
Condensate
6" Min
12" Max
*
System Return
DHW Circulator Requirements:
1. S.S. or Bronze Body & Impeller
* DHW Side 2.5 PSI Pressure drop @ 2 GPM
2. > 0.5 GPM to Activate Burner
3. Maximum 2 GPM
4. Programmable Timer
5. Selectable Aquastat
* Set minimum 5°F below NCB DHW Setpoint
Purge
Valve
Do
me
stic
He
atin
g
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-NPE-BF01
Air Elimination
Solenoid
Valve
NCB-E Series Combi-Boiler & NPE (A/S) Series Tankless
Navien NCB-E Combi-Boiler Application
With NPE-A or S Tankless Water Heater
S
Gas
Hydronic
Feed
Water
Domestic Cold Water
Condensate
6" Min
12" Max
CH
Domestic Hot Water
Communication
Cable
Ga
s
Opt. DHW Recirculation – A Model
S
Do
me
stic
He
atin
g
System Return
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
T
Check Valve Circulator
Drawn By: B.F. February 9, 2016
Pressure
Relief
ValveExpansion
Tank
Aquastat
Full-port
Ball Valve
Mixing
Valve
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Backflow
PreventorNCB-E-2NPE-BF01
Air Elimination
Solenoid
Valve
NCB-E Series Combi-Boiler & NPE (A/S) Series Tankless
Navien NCB-E Combi-Boiler Application
With Two NPE-A or S Tankless Water Heater
S
Gas
Hydronic
Feed
Water
Domestic Cold Water
Condensate
6" Min
12" Max
CH
Communication
Cable
Ga
s
S
CH
Domestic Hot Water
Ga
s
Opt. DHW Recirculation
NPE– A Models
Communication
Cable
Do
me
stic
He
atin
g
System Return
20 Goodyear
Irvine, CA 92618
800-519-8794
www.navien.com
Check Valve Circulator
Pressure
Relief
Valve Expansion
Tank
Wire
SpliceFull-port
Ball Valve
Mixing
Valve
Storage
Vessel
DHW Circulator
w/Aquastat & Check Valve
This drawing is intended only as a guide and not as a replacement for professionally engineered project drawings.
This concept system drawing does not imply compliance with local building codes. Actual installation may vary
depending on installation location & parameters and it must be done in accordance to all local building codes.
Verify with local building officials before commencement of system installation.
Drawn By: B.F. NCB/NCB-E-Wire-BF February 9, 2016
Navien NCB/NCB-E Combi Series
Air Handler Unit Wire Diagram Example
(Thermostat is Control Center)
NCB/NCB-E Series Combi Boiler
Cooling Unit
Contactor
(Optional)
RH RC W Y G C
Typical Programmable Thermostat
R C G W
Typical AHU
Navien NCB/NCB-E PCB
CN23 CN10
A/H T/S
Notes:
6 wires - Navien to Thermostat with Cooling (4 required, no cooling)
3 wires – Navien to AHU
2 wires – Navien to AC Condensor
(All splices shown at Navien unit for wiring ease)
1. Remove factory jumper at thermostat (RH to RC) to isolate
AHU and Navien for dual transformer operation
2. Set programable thermostat for electric heat mode
(This is done with manual switch or programming, follow
manufacturer instructions)
3. Using terminals will disrupt AHU fan signal during call for heat
when domestic is actvated on the combi boiler (feature is not
required to be used, direct connecting G to AHU).
* This closes RC to G (AHU fan) & RH to W (boiler heat call).
1
2 *ELE HT
ON
3