Laars PNCH, PNCV User Manual

User's Manual Document 1374

User's Manual for

™

PENNANT

includes

Hydronic Boiler

Model PNCH

Water Heater

Model PNCV
Sizes 500-2000

U.S. Reg. 2,765,423

'LOW TEMP PENNANT'

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualied in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in ue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty. For indoor installations, as an additional

measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the

vicinity of this appliance and in any adjacent occupied spaces.

WARNING

If the information in this manual is not

followed exactly, a re or explosion may
result causing property damage, personal

injury or loss of life.

Do not store or use gasoline or other

ammable vapors and liquids in the vicinity
of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not

use any phone in your building.

• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call
the re department.

Installation and service must be performed
by a qualied installer, service agency, or gas
supplier.

Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inammables dans
le voisinage de cet appareil ou de tout autre
appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.

• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions du

fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualié ou
par le fournisseur de gaz.

AVERTISSEMENT

H2380000-

Page 2

TABLE OF CONTENTS

LAARS Heating Systems

SECTION 1 Caring For Your Pennant ....................... 3

1.A General Care ............................................3

1.B Annual Inspection of Flue and Vents ........3

1.C In the Event of a Power Failure ................3

1.D Full Service Every Three (3) Years ...........3

SECTION 2 Touchscreen and System Ops ...............4

2.A The Home Screen ....................................4

2.A.1 Home Screen Status Window...................4

2.A.2 Home Screen Active Icons .......................5

2.B Lock/Unlock Display Screen .....................6

2.C Keypad Operations ...................................7

2.D Quick Start ..............................................8

2.D.1 CH /DHW .................................................8

2.D.1.a CH1 /DHW11 ............................................ 8

2.D.1.b CH2/DHW2 2 ............................................8

2.D.2 DHW/DHW3 ............................................9

2.D.3 Outdoor Reset .........................................9

2.D.4 Warm Weather Shut Down ...................... 9

2.D.5 Anti-Short Cycle .....................................10

2.D.6 Time & Date ........................................... 10

SECTION 3 Electrical Connections ..........................11

3.A Installation Warnings ...............................11

3.B Line Voltage Connections ........................11

3.B.1 Main Power..............................................11

3.B.2 Pump Power ............................................11

3.B.3 Boiler/Heater Pump ................................11

3.B.4 Auxiliary Power Output ............................11

3.C Low Voltage Connections ....................... 12

3.C.1 Field Wiring - Inputs................................12

3.C.1.a Safety Interlocks .....................................12

3.C.1.b PNCH/PNCV Heat Demands .................12

3.C.1.c Field Inputs (Open/Closed)..................... 12

3.C.1.d Temperature Sensors ............................. 12

3.C.2 Field Wiring - Outputs ............................13

3.C.2.a Dry Contacts ...........................................13

3.C.1.e Analog (BAS) Input .................................13

3.C.2.b Cascade RS485 .....................................14

3.C.2.c BAS RS485 ............................................ 14

3.C.2.d 24VAC .................................................... 14

3.D Cascade Wiring Connections .................15

SECTION 4 Burner Set Up ......................................15

4.A Set Up for 0 to 2500 Feet Altitude ..........15

4.B Set Up for High Altitude

( >2500 Feet ) .........................................16

Pennant (500-2000), User's Manual

SECTION 1 Caring For Your

Pennant

Your Pennant will require very little

Maintenance. However, as with any ne appliance
there are certain steps that should be taken to ensure
continuing optimum performance.

Page 3

WARNING

Do not use this boiler if any part has been

under water. Immediately call a qualied

service technician to inspect the boiler and to
replace any part of the control system and any
gas control which has been under water.

1.A General Care

Keep the area around the Pennant clean and
free from combustible materials, gasoline and other
ammable liquids and vapors.

The Pennant must be completely isolated and
protected from any source of corrosive chemical fumes
such as trichlorethylene, perchlorethylene, chlorine,

etc.

Keep grille openings on the boiler free for proper
ventilation of interior components.

Do not obstruct or block a free ow of air to the
boiler to ensure proper ventilation.

If desired, clean the jacket surfaces with a damp
cloth and mild detergent. Do not use ammable
cleaning materials.

If sidewall vented, keep the vent terminal clear
of obstructions — do not pile snow against the vent
terminal. Clean the air lter(s) often, and then develop
an appropriate maintenance schedule.

1.B Annual Inspection of Flue and Vents

Visually inspect the vent pipe once a year. Should
any deterioration exist, have the affected parts replaced
by a qualied service person.

WARNING

Should overheating occur or the gas supply
fail to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut
off the gas supply at a location external to the
boiler.

FOR SERVICE

Contact your installing contractor, gas utility,
Laars dealer, or call Laars for the nearest
authorized representative in your area.

1.C In the Event of a Power Failure

The Pennant can not be operated during an
electrical power outage. If there is an extended power
outage with danger from freezing, then the Pennant
(and all other water systems) should be drained
completely. When draining the boiler, turn off main
electrical disconnect switch. When placing back in
service, refer to start-up instructions in the Installation
and Operation Manual for lling and purging.
Draining and lling shall only be done by a qualied
service person.

1.D Full Service Every Three (3) Years

In addition to the annual visual inspections, a
qualied service agency should conduct a detailed
inspection of all ue product carrying areas of the
boiler and its venting system.

Page 4

Icon

Description

Setpoint
CSP:

CH1:

CH2:
DHW:

Heat Demand
Setpoints
NOTE: The heat
demand set point
will turn green in
color when active.

Pumps
Boiler:
System:
DHW:

Pump Status
(On/Off)

Boiler Status
B1: Running
B2: Running
Stage 1:
Stage 2:
Stage 3:
Stage 4:
Blower 1:
Blower 2:
OAT:

Pennant Status:

• Burner Bank 1

• Burner Bank 2

• Staging (on/off)

• Blower Speed

(high/low)

• OAT - Outdoor
Ambient
Temperature
(when
connected)

SECTION 2 Touchscreen and System Operations

2.A The Home Screen

Figure 1. The Home Screen

LAARS Heating Systems

2.A.1 Home Screen Status Window

The central area of the home screen displays the

current status information for the unit.

Heat Demand Setpoints.
Pump Status.

Boiler Status (Boiler Bank).
System Temp.
and DHW Temp (if installed)

Heat Demand Setpoints.
NOTE: The heat demand set point will

turn green in color when active

Model Stages

Low Temp On/Off

500 - 750 2

1000 3
1250 - 2000 4

Table 1. Stages per Model

Inlet & Outlet Temperature.

Figure 2. The Status Display Area, dened.

Pump Status.

System Supply /

Return Temperature
(when connected).

DHW

Temperature
(when connected).

Pennant (500-2000), User's Manual

2.A.2 Home Screen Active Icons

Name Icon Description

Page 5

Security

Quick Start

Congure

Service

Messages

Active

Demands

Navigation

Bar

Displays the current lock status. Touch the lock icon to lock or unlock the

Touchscreen Display.

Provides quick touch access to the most commonly used parameters for easy

installation.

Will take you to ALL of your congurations and parameters for a detailed setup of

the unit. This is the largest group of menu screens.

Allows the service technician to access the basic diagnostic and troubleshooting

information.

Will show an 'Exclamation' when there is a message.

Clicking onto the Message icon will take you to the message itself.
The USB functionality will show the USB Icon at this location, if

being used.

Will show icons that indicate the active parameters that are

currently in demand.

The Navigation Bar is the constant indicator of where you are as you

navigate into and out of the touchscreens. See Screen 2 on page 7

ERROR Codes also show in the Navigation Bar when there is one of several unit

errors or shut-downs that have occured.

Date &

Time

Table 2. The Active Icons on the Home Screen, and what they do.

For Display Only. To change date and time, go to the

Conguration menu.

Page 6

2.B Lock / Unlock Display Screen

Password Protection:
To change parameters, a password is required.
The control system includes three levels of password
protection.

-OEM Password: Setup and parameter changes

available only to the factory.

-INSTALLER Password: Setup and parameter

changes made during the initial setup and

commissioning. The installer password is 17.

-USER Password: Non-critical adjustments and
functions. The user password is lhs.

Logout. Allows the user to log out of the

password.

Password Unlocked. The lock will change

states depending on the Password level that was
entered. The inside of the Lock Icon will also change
between O, I, or U to denote what level you are logged
into. O= OEM; I= Installer; U= User.

There are 2 ways you can navigate to the

Password Entry screen.
a. By pressing the “Lock” icon on the center of the

top bar of any screen.

b. By navigating to “Congure”, then by pressing

the “Login” button on the lower right hand corner
of the “Congure” screen.

LAARS Heating Systems

Screen 1. Sign in Screen

Password Locked. If the password

is “Locked”, the user is automatically logged out after
a certain amount of time of inactivity on the screen. If
the password is “Unlocked” then the user will not be
automatically logged off. You can set this time interval
in Service -> Screen -> Auto Lock Timeout.

This screen works just like a normal “Qwerty”
keyboard. After entering in the correct password
needed, select “Enter” to unlock the appropriate

control settings.

Pennant (500-2000), User's Manual

2.C Keypad Operations

As you navigate in, you will nd that all screens have either
a numeric keypad to enter in your customizable parameters OR
selection buttons to choose the device of your conguration.

NOTE: You can always tell exactly where you have navigated to by

looking at the icons in the

In this example you are in

Home/Congure/Central Heat/Central Heat One

Navigation Bar.

Page 7

Shows the current setting

of the Parameter.

These windows will reect the

allowable ranges that the setting
can be adjusted to.

To delete the current setting before

entering in the new value.

“Up and Down” arrows are used to

increment the setting accordingly.

Screen 2. A typical numeric keypad entry screen.

Screen 3. A Typical selection screen.

The “Enter” button is used to accept

the new value that was just entered.

This is the indicator that will be shown when

the correct password has been entered to

allow the setting to change.

The highlighted button (orange)

shows which one is selected.
Some screens may only allow you
to set one or the other, while some
other screens (example: pump
selection) will allow you to select
any or all of the options.

The “Back” button jumps to the

previous screen.

Page 8

2.D Quick Start

To navigate to the Quick Start Screen, touch the
Quick Start Icon in the lower left-hand portion of the
Home Screen.

Screen 4. Home Screen

LAARS Heating Systems

Touching CH1/DHW1 navigates to the CH1/

DHW1 Quick Start Screen

1

2.D.1.a CH1 /DHW1

Screen 7. CH1/DHW1 Quick Start Screen

Screen 5. Quick Start Screen

CH is Central Heat DHW is Domestic Hot Water

2.D.1 CH /DHW

On the Quick Start Screen, touch the CH/DHW
thermometer icon to navigate to the CH Selection
Screen

There are two identical heat demands, CH1/DHW1
and CH2/DHW2, each with independent control
algorithms and independent inputs on the input
terminal strip.

NOTE: CH1 applies to hydronic units (PNCH),

while DHW1 applies to volume water units (PNCV).

• Enable/Disable – This allows CH1/DHW1 to be

enabled/disabled. The default setting is Enabled.

• Set Point – This is the temperature that this heat

demand will control to.

2

2.D.1.b CH2/DHW2

To navigate to the CH2/DHW2 Quick Start Screen,
touch the CH2 Icon on the CH/DHW Quick Start
Selection Screen.

Screen 8. CH2/DHW2 Quick Start Screen

Screen 6. CH/DHW Quick Start Selection Screen

NOTE: CH2 applies to hydronic units (PNCH),

while DHW2 applies to volume water units (PNCV).

Pennant (500-2000), User's Manual

Page 9

2.D.2 DHW/DHW3

To navigate to the DHW/DHW3 Quick Start
Screen, touch the DHW faucet icon on the Quick Start
Screen.

Screen 9. DHW/DHW3 Quick Start Screen

The DHW/DHW3 Quick Start Screen allows
adjustment of the following parameter:

• Enable/Disable – This allows DHW/DHW3 to be

enabled/disabled. The default setting is Enabled.

• Set Point – This is the temperature that this heat

demand will control to.

temperature at which the Pennant will maximize the
boiler outlet temperature to the Maximum Water
Temperature.

NOTE: Outdoor functionality is applicable to

hydronic units only, and is explained in Installation
Manual (Doc 1373)

2.D.4 Warm Weather Shut Down

To navigate to the Warm Weather Quick Start
Screen, touch the Warm Weather Icon on the Quick
Start Screen.

NOTE: A DHW/DHW3 heat demand can be

initiated by an aquastat or sensor, see Sections 5.3.1.2
and 5.3.1.4 respectively.

2.D.3 Outdoor Reset

To navigate to the Outdoor Quick Start Screen,

touch the Outdoor Icon on the Quick Start Screen.

Screen 10. Outdoor Quick Start Screen

The Outdoor Quick Start Screen allows the

adjustment of the following parameters:

• Enable/Disable – This allows Outdoor Reset to

be enabled/disabled. The default setting is Enabled.

• Maximum Ambient Temperature – The

outdoor temperature at which the Pennant will limit
the boiler outlet temperature to the Minimum Water
Temperature.

• Minimum Ambient Temperature – The outdoor

Screen 11. Warm Weather Quick Start Screen

The Warm Weather Quick Start Screen allows
adjustment of the following parameters:

• Temp Min – Upon an active warm weather

shutdown condition, this is the temperature at which
the Pennant will reset the shutdown condition to
satisfy a heat demand.

• Temp Max – This is the temperature at which the

warm weather shutdown condition will occur.

• Feature Options – This parameter provides the

ability to either disable warm weather shutdown or
upon a warm weather condition, congure the Pennant
to shut down immediately or to shut down after the
current heat demand is satised.

Page 10

LAARS Heating Systems

2.D.5 Anti-Short Cycle

To navigate to the Anti-Short Cycle Quick Start
Screen, touch the Anti-Short Cycle Icon on the Quick
Start Screen.

Screen 12. Anti-Short Cycle Quick Start Screen

The Anti-Short Cycle Quick Start Screen allows
adjustment of the following parameter:

• Cycle Time – The amount of time after a heat

demand is satised that the Pennant will wait to satisfy
the next active heat demand.

NOTE: Anti-Short Cycle Time does not apply to

DHW/DHW3 heat demands.

2.D.6 Time & Date

To navigate to the Time & Date Quick Start
Screen, touch the Time & Date Icon on the Quick Start
Screen.

Screen 13. Time & Date Quick Start Screen

The Time & Date Quick Start Screen allows
adjustment of the following parameters:

• Hour – The hour that will be displayed in the

upper banner on each screen, and the time captured in
the date/time stamp for lock-out conditions displayed

on the history screen.

• Minute – The minute that will be displayed in the

upper banner on each screen, and the time captured in
the date/time stamp for lock-out conditions displayed

on the history screen.

• Month – The month that will be displayed in the

upper banner on each screen, and the date captured in
the date/time stamp for lock-out conditions displayed

on the history screen.

• Day – The day that will be displayed in the upper

banner on each screen, and the date captured in the
date/time stamp for lock-out conditions displayed on

the history screen.

• Year – The month that will be displayed in the

upper banner on each screen, and the date captured in
the date/time stamp for lock-out conditions displayed

on the history screen.

Pennant (500-2000), User's Manual

Over Current Recommendations (Amps)

Pennant

Pump Only

Size

Without

Pump

With

Pump

Taco

B & G

500

15

20

15

15

750

15

20

15

15

1000 20

25 –Taco

30 – B & G

15 15

1250

25

30

15

15

1500

25

30

15

15

1750

25 – 15

20

2000

25 – 20

20

SECTION 3 Electrical Connections

3.A Installation Warnings

WARNING

This appliance must be electrically grounded
in accordance with the requirements of the authority
having jurisdiction or, in the absence of such
requirements, with the latest edition of the National
Electrical Code, ANSI/NFPA 70, in the U.S. and with
the latest edition of CSA C22.1 Canadian Electrical
Code, Part 1, in Canada. Do not rely on the gas
or water piping to ground the metal parts of the
boiler. Plastic pipe or dielectric unions may isolate
the boiler electrically. Service and maintenance
personnel, who work on or around the boiler may

be standing on wet oors could be electrocuted by

an ungrounded boiler. Electrocution can result in
severe injury or death.

Single pole switches, including those of safety
controls and protective devices, must not be wired in
a grounded line.

All electrical connections are made at the
power terminals, which are located at the rear of the
appliance, or at the input/output terminal strips which
are located on the right side of the appliance.

All internal electrical components have been
prewired. No attempt should be made to connect
electrical wires to any other location except the
terminal blocks.

Page 11

3.B.2 Pump Power

The pump circuit is identied by three 12 AWG
wires: black with a white stripe (L2), white (N2), and
green (Ground).

If desired, an installer can change the pump
mounted single service units to use a separate circuit
for the pump. Instructions to make this change are
found in the Installation Manual (Doc 1373)

Table 3. Circuit Protection

3.B Line Voltage Connections

Incoming power must be protected by the
appropriate circuit breaker (fuse) and installed by a
qualied electrician or authorized/qualied personnel.
Recommended over current protection ratings are
shown in Table 3.

3.B.1 Main Power

All non-pump mounted Pennants require a
single 120-volt supply. Pump mounted Pennant
sizes 500-1500 also use a single 120-volt supply, and
Pennant sizes 1750-2000 require two separate 120-volt
supplies.

Pennant sizes 500-1500 main power (L1, N1, and
Ground) shall be connected to the three wires supplied.
This main power circuit is identied by three solid
colored wires (10 AWG) – black (L1), white (N1), and
green (Ground).

Pennant sizes 1750-2000 main power (L1,
N1, and Ground) is identied by three solid colored
wires (10 AWG) – black (L1), white (N1), and green
(Ground). The pump circuit is identied by three 12
AWG wires.

3.B.3 Boiler/Heater Pump

Conversion to a separate pump circuit requires
bringing in a separate circuit for the pump and
removing the three jumper wires within the internal
wiring of the 120-volt portion of the Pennant (see
Figure 3). This action should only be performed by
qualied personnel, with the power disconnected from

the unit.

To rewire the pump circuit, bring in a separate
120-volt circuit (L2, N2, and Ground). Remove
the jumper wires shown in Figure 3. Connect the
incoming line voltage (L2) to the main power switch
using a ¼” female insulated push on terminal. From
the other side of the main power switch, connect to
the main power terminal block, in the rear of the unit,
using a ¼” female insulated push on terminal. This
will be in the same position where the line voltage
jumper terminated. Connect N2 and Ground to the
main terminal block, in the rear of the unit, using ¼”
female insulated push terminals. These connections
will also be the same positions where the neutral and
ground jumpers were terminated.

Page 12

terminals 7 and 8 of the input terminal strip.

DHW/DHW3: Connect the aquastat or end switch
(isolated contact only) wires to terminals 5 and 6 of the
input terminal strip. If preferred, a DHW tank sensor
can be used in lieu of an aquastat to generate a heat
demand, refer the Installation Manual (Doc 1373)

NOTE: The heat demand contacts must be dry
contacts. The Pennant controller heat demand voltage
is 24VDC.

3.C.1.c Field Inputs (Open/Closed)

Field Input 1: Field Input 1, if used, is connected
across terminals 9 and 10 of the input terminal strip.
When connected, Field Input 1 controls the Auxiliary
Dry Contact. If Field Input 1 is open, the Auxiliary
Dry Contact is open. If Field Input 1 is closed, the
Auxiliary Dry Contact is closed. Only dry contacts
can be connected to Field Input 1.

LAARS Heating Systems

Figure 3. Removing Jumpers.

3.B.4 Auxiliary Power Output

The Auxiliary Power Output, if used, is controlled
by Field Input 2. When Field Input 2 is closed,
line voltage is supplied at terminal 7 and neutral on
terminal 8 of the output terminal strip. This output is
rated for 250VAC, 2.5A maximum.

3.C Low Voltage Connections

Route all wires through the knockouts on the right side
of the Pennant. Connect low voltage wiring to the
input and output terminals shown in Figure 4. Connect
all wiring as shown on the wiring diagram.

3.C.1 Field Wiring - Inputs

3.C.1.a Safety Interlocks

Field Interlock: If the Field Interlock is utilized,
remove the jumper from the terminals 1 and 2 of the
input terminal strip and wire the interlock to these
terminals. Only dry contacts can be connected to the
Field Interlock terminals.

NOTE: Safety chain voltage is 24VDC.

3.C.1.b PNCH/PNCV Heat Demands

CH1/DHW1: Connect the thermostat/aquastat or end
switch (isolated contact only) wires to terminals 3 and
4 of the input terminal strip.

CH2/DHW2: Connect an additional thermostat/
aquastat or end switch (isolated contact only) wires to

Field Input 2: Field Input 2, if used, is connected
across terminals 11 and 12 of the input terminal strip.
When connected, Field Input 2 controls the Auxiliary
Power Output. If Field Input 2 is open, the Auxiliary
Power Output is off. If Field Input 2 is closed, the
controller turns power on at the Auxiliary Power
Output.

NOTE: The controller applies 24VDC to the Field
Inputs to detect the status of the contacts.

3.C.1.d Temperature Sensors

System Supply: The system supply sensor, if used, is
connected to terminals 14 and 15 of the input terminal
strip. When connected, the controller automatically
detects the presence of this sensor. If installed, the
Pennant controls the staging of the burners to maintain
the system supply temperature to the heat demand set
point. The system supply temperature is shown on
the home screen above the red system input arrow, see
Figure 1 on page 4. This sensor is supplied loose
with the Pennant and is installed in the piping or tank

per the suggested piping diagrams.

System Return: The system return sensor, if used, is
connected to terminals 16 and 17 of the input terminal
strip. When connected, the controller automatically
detects the presence of this sensor. There is no control
logic associated with this sensor. When connected,
this temperature is shown on the home screen above
the blue system output arrow. This sensor is supplied
loose with the Pennant and is installed in the piping or

tank per the suggested piping diagrams.

Domestic Hot Water (DHW): The DHW sensor, if
used, is connected to terminals 18 and 19 on the input

Pennant (500-2000), User's Manual

Figure 4. Input and Output Terminal Strips

Page 13

Detail

3.C.2 Field Wiring - Outputs

3.C.2.a Dry Contacts

terminal strip. When connected, the Pennant will use
this sensor to perform the DHW thermostat function.
The controller automatically detects the presence
of this sensor and initiates a call for heat when the
DHW temperature drops below the DHW set point
by the value of the DHW On Hysteresis (DHW Set
Point – DHW On Hysteresis = DHW heat demand).
The DHW heat demand is satised when the DHW
temperature rises above the DHW set point by the
value of the DHW Off Hysteresis (DHW Set Point +
DHW Off Hysteresis = DHW heat demand satised).
When connected, this temperature is shown on the
home screen below the faucet icon. This sensor is
supplied loose with the Pennant and is installed in the

tank per the suggested piping diagrams.

Outdoor: The outdoor sensor, if used, is connected to
terminals 20 and 21 of the input terminal strip. When
connected, the controller automatically detects the
presence of this sensor. If installed, options such as
outdoor reset and warm weather shutdown can be
enabled through the display.

3.C.1.e Analog (BAS) Input

Building Automation System (BAS): The BAS input,
if used, is connected to terminals 22 and 23 of the
input terminal strip. When making the connection,
adhere to the polarity designations shown on the label

or wiring diagram. The input signal can be

0 – 10 VDC or 4 – 20 mA, and can be used to control
the ring rate or set point.. The factory default setting
is for a 0 – 10VDC signal. Congure for 4 – 20 mA
by placing a jumper on CN20 on the control board, see

Figure 5.

Run: These contacts, when used, are connected to
terminals 1 (common), 2 (normally closed), and 3
(normally open) of the output terminal strip. The
controller closes the normally open set of contacts
whenever the Pennant is running. This is typically
used by a BAS to verify the Pennant is satisfying a heat
demand. Contact ratings are 250VAC, 0.6A maximum.

Alarm: These contacts, when used, are connected
to terminals 4 (common), 5 (normally closed), and
6 (normally open) of the output terminal strip. The
controller closes the normally open set of contacts
whenever the Pennant is locked out or power is turned
off. Contact ratings are 250VAC, 0.6A maximum.

DHW Pump: When connecting a domestic hot water
(DHW) pump, use terminals 9 and 10 of the output
terminals strip. As this is a dry contact, the DHW
pump contact must be wired with either the DHW
pump supply voltage or DHW pump relay coil voltage.
DHW pump functionality is congured using the touch
screen. Contact ratings are 250VAC, 1.5A maximum.

System Pump: When connecting a system pump, use
terminals 11 and 12 of the output terminal strip. As
this is a dry contact, the system pump contact must
be wired with either the system pump supply voltage
or the system pump relay coil voltage. System pump
functionality is congured using the touch screen.
Contact ratings are 250VAC, 1.5A maximum.

AUX: These contacts, when used are connected to
terminals 13 and 14 of the output terminal strip. The
controller closes this contact when Field Input 1 is
closed; otherwise, this contact remains open. Contact
ratings are 250VAC, 1.5A maximum.

Page 14

LAARS Heating Systems

JUMPER

4 - 20mA

ANALOG

INPUTS

NO JUMPER

0 - 10VDC

JUMPERS

4-20 mA

JUMPERS

0 - 10VDC

ANALOG OUTPUTS

Figure 5. Analog Input and Output Jumper Placement

3.C.2.b Cascade RS485

Prior to wiring Pennant units for cascade operations,
select one Pennant as the lead boiler/heater. Other
Pennants connected to the lead boiler/heater will be
referred to as lag units.

Communication between lead and lag units is
accomplished using RS485. When wiring Pennant
units for cascade operations, use terminals 22 (B), 23
(A), and 24 (GND) of the output terminal strip. Use
2-wire twisted pair, shielded w/drain, communication
cable between units. Referring to Figure 6, connect
one end of the twisted pair wires to A (terminal 23),
and the other to terminal B (terminal 22), and the
drain wire to GND (terminal 24). Connect the other
end of the cable to the next Pennant, matching the
termination wiring on the previous unit, except for
GND. Only connect the drain wire to ground on one
end of the cable to avoid ground loop issues. If more
than two Pennant units are cascaded together, daisy
chain the wiring from Pennant to Pennant, keeping the
cables as short as possible.

A system supply sensor must be installed and
connected to the lead boiler, see System Supply in
Section 5.3.1.4 – Temperature Sensors. The lead
boiler will use this system supply sensor as the
temperature control sensor for cascade operations.

CH1/DHW1 terminals are used to initiate a heat
demand at the lead boiler, refer to CH1/DHW1 in Heat
Demands of the Installation Manual (Doc 1373).

3.C.2.c BAS RS485

These terminals, when used, are for RS485 serial
communication with a BAS system using BACnet
MS/TP or Modbus protocols. Use 2-wire twisted pair,
shielded w/drain, communication cable between the
BAS and Pennant.

3.C.2.d 24VAC

There are terminals for 24VAC on the output terminal
strip. These terminals are reserved for Pennant low­temp units or a low water cuto-off option kit.

Pennant (500-2000), User's Manual

3.D Cascade Wiring Connections

Page 15

TB2-22

TB2-24

TB2-23

TB2-22

TB2-24

TB2-23

TB2-22

TB2-24

TB2-23

Figure 6. Cascade Wiring Connections

TB2-19

TB2-21

RS485 B

RS485

GND

TB2-20

BAS

RS485 A

TB2-19

TB2-21

RS485 B

RS485

GND

TB2-20

BAS

RS485 A

TB2-19

TB2-21

RS485 B

RS485

GND

TB2-20

BAS

RS485 A

Figure 7. Cascade BAS Wiring Connections

For the complete list of wiring diagrams and logic diagrams, please see the
Installation and Operating Manual. Document 1373

SECTION 4 Burner Set Up

4.A Set Up for 0 to 2500 Feet Altitude

The Pennant appliance utilizes a modular design

to achieve its stage-ring. The setup must be
checked before the unit is put in operation.
Problems such as failure to start, rough ignition,
strong exhaust odors, etc. can be due to improper
setup. Damage to the Pennant resulting from
improper setup is not covered by the limited
warranty.

1. Using this manual, make sure the installation
is complete and fully in compliance with the
instructions.

2. Determine that the appliance and system are
lled with water and all air has been bled from
both. Open all valves.

3. Observe all warnings on the Operating
Instructions label and turn on gas and electrical

power to appliance.

4. Switch on the appliance power switch located on
the right side of the unit.

5. The Pennant will enter the start sequence, as long
as the unit is being called for heat. The blower
and pump come on for pre-purge, then the ignitor
warm-up sequence starts and after the ignitor
warm-up is complete and all safety devices are
veried, the gas valves open. If ignition doesn’t
occur, check that there is proper gas supply. Wait
5 minutes and start the unit again. During initial
start up, air in the gas line may cause the Pennant
to "lock out" during the rst few trials for ignition.
Depending on the ignition modules installed, the
manual reset button on the ignition modules may
need to be depressed to restart the Pennant.

6. With the unit running, verify the supply gas
pressure, manifold gas pressure, and CO2
according to the Table 4

Page 16

6. With the unit running, verify the supply gas pressure, manifold gas pressure, and CO2 according to the

table below.

Natural Gas

Propane

Typical

7” w.c. (1.7kPa)

11” w.c. (2.7kPa)

Range

5” w.c. ≤ (supply pressure ) ≤ 13” w.c.

Manifold Gas Pressure

2.5” w.c. (0.62 kPa)

CO

8%

9.2%

Supply Gas
Pressure

2

Table 4. Supply Gas Pressure

7. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested.

To test:

(a) Close gas shutof

f valve with burner operating.

(b) The ame will go out and blower will continue

to run for the post pur

ge cycle. One additional
attempt to light will follow. Ignition will not occur
as the gas is off. The ignition control will lockout,
and will have to be reset before the unit will
operate.

(c) Open gas shutof

f valve. Restart the appliance.
The ignition sequence will start again and the
burner will start. The appliance will return to its
previous mode of operation.

NOTE: Sizes 1000–2000 have two ignition controls

and two ignitors, which work independently of one
another. If the ignition control for stages 1 and 2
fails to properly light the main burners for those
stages, the second ignition control will still be
active, and will be able to energize stages 3 and

4. This, of course, will only occur if all other safety

devices conrm that the unit will run in a safe

condition.

4.B Set Up for High Altitude
( >2500 Feet )

Pennant appliances may be operated at high altitude
(7700 ft., 2347 m) with a reduction in output of approx­imately 10%. At altitudes of less than or more than 7700
ft. (2347 m) the appliance will perform equally as well,
but with differing reductions in output. At elevations
higher than 7700 ft. (2347 m) the reduction in output
will exceed 10% and at elevations below 7700 ft. (2347
m) it will be less than 10%. High altitude adjustment
must not be made on appliances operating at elevations
below 2500 ft. (762 m).
No orice changes are required to adjust the
Pennant appliances for high altitude. High altitude
adjustment is accomplished by adjustment of the
gas valve manifold pressure and the air shutter(s).

LAARS Heating Systems

The required instruments used to assist in these
adjust-ments are a CO

or O2 Analyzer and a U-Tube

2

Manometer or other device capable of reading a
pressure of 2.5-3.0 inches w.c. (0.62-0.75 kPa).

Start the adjustment process by checking the

in the “as installed” condition. Adjust the air

CO

2

shutter(s) so that the CO

is about 8% or the O

2

about 6.8% for appliances operating on Natural Gas.
For appliances operating on LP Gas adjust the air
shutter(s) so that the CO

is about 9.2% or the O

2

about 6.8%. Appliances with two blowers should be
adjusted so that the air shutters below each blower are
open the same amount.

Once the CO

or O2 has been set, the manifold

2

pressure may be adjusted. Remove the 1/8 NPT plug
from the lower side of the gas valve that is to be
set and install a tting, hose and manometer. Start
the appliance and observe the manifold pressure.
Manifold pressure must be adjusted to 3.0 in. w.c.
(0.75 kPa) (for high altitude only, standard operating
pressure is 2.5 in. w.c. (0.62 kPa)). It is adjusted by
removing the slotted cap on the gas valve and turning
the adjustment screw (beneath the cap) clockwise to
increase pressure and replaced after the adjustments
have been completed and the tting, hose and
manometer have been removed and the 1/8" plug has
been replaced. Repeat this process until all gas valves

have been set. Note: The pressure can be set only

when the appliance is operating and only when the
particular gas valve being adjusted is energized by a
call for heat from the staging control.

After all of the gas valve manifold pressures have

been set, the CO

or O2 must be reset. CO2 or O

2

will have changed when the manifold pressure was
adjusted. Open the air shutter(s) to reduce the CO

to the values achieved previously.

O

2

The procedure is complete when all gas valves are

adjusted to a manifold pressure of 3.0 in. w
kPa) and the CO

is adjusted to 8.0% for Natural Gas

2

appliances or 9.2% for LP appliances. When using an

analyzer, the correct O2 is 6.8% for both Natural

O

2

Gas and LP appliances.

Caution

Should any odor of gas be detected, or if the

gas burner does not appear to be functioning
in a normal manner, close main shutof f valve,
do not shut off switch, and contact your heating
contractor, gas company, or factory representative.

is

2

is

2

2

2

.c. (0.75

or

Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax [phone]

www.Laars.com Printed in U.S.A. © Laars Heating Systems 1710 Document 1374

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