Laars Pennant PNCP, Installation And Operation Instructions Manual

LAARS Heating Systems

Page 22

“inducer” terminals F1 and F2 of the (Fenwal) ignition
module. The 24V power to the T’STAT terminal of
the ignition module(s) are routed through the safety
interlocks.

The ladder diagram for models 1250, 1500, 1750

and 2000 is shown in Figure 13. These models have
two ignition modules, each with its own blower, and
each controlling part of the input so that startup at
reduced input is provided. The blowers are energized
by the ignition modules indirectly via switching
relays. When either ignition module receives a call for
heat, it switches its blower to high speed and the
blower of the idle ignition module to low speed.

The wiring schematic for the Pennant 500 – 1000

is shown in Figure 14, and the schematic for the 1250
– 2000 models is shown in Figure 15. All 24V wiring
is routed through the diagnostic PC board. Wiring
harnesses connect between the diagnostic PC board
and the control components, indicator board, or field
wiring terminal strip. The diagnostic board contains
LEDs that indicate open status of the safety interlocks,
and quick-connect terminals that provide tests points
for checking voltage/continuity at various points in the
control circuit.

Certain control elements that may need to be

rewired in the field are connected via the field wiring
terminal strip rather than to the diagnostic PC board.
These include the low-water cutoff (LWCO), external
alarm, and water flow switch.

SECTION 9.
Replacement Parts

Only genuine Laars replacement parts should be used.

9.1 General Information

To order or purchase parts for the Laars Pennant,

contact your nearest Laars dealer or distributor. If they
cannot supply you with what you need, contact
Customer Service (see back cover for address,
telephone and fax numbers).

9.2 Parts List

Model

Model

Model

Model

Model

Model

Model

Item

Description

500

750

1000

1250

1500

1750

2000

Sheet Met

al Component

s

See Figure 9

1

Panel, Jacket, Side Lef

t

5C3420

5C3420

5C3420

5C3420

5C3420

5C3420

5C3420

2

Panel, Jacket, Side Right

5C3520

5C3520

5C3520

5C3520

5C3520

5C3520

5C3520

3

Panel, Jacket, Front

5C3320

7C3320

10C3320

12C3320

3

Panel, Jacket, Front, Lef

t

15C3320

17C3320

20C3320

4

Panel, Jacket, Front, Right

15C3320

17C3320

20C3320

5

Panel, Jacket, Rear

5C3220

7C3220

10C3220

12C3220

15C3220

17C3220

20C3220

5A

Panel, Jacket, Rear

, Filter Enclosure

15C3026

15C3026

15C3026

6

Panel, Jacket, 

T

o

p

5C3021

7C3021

10C3021

12C3021

6

Panel, Jacket, 

T

op, Lef

t

15C3021

17C3021

20C3021

7

Panel, Jacket, 

T

op Right

15C3025

17C3025

20C3025

8

Control Door

, 

Access

5C3010

5C3010

5C3010

5C3010

5C3010

5C3010

5C3010

9

Plate, Gas Pipe Seal

5C3304

5C3304

10C3304

20C3304

20C3304

20C3304

20C3304

(2)

(2)

(2)

(2)

(2)

(2)

(2)

10

Plate, Cover

, W

iring

5C3502

5C3502

5C3502

5C3502

5C3502

5C3502

5C3502

1

1

Plate, V

ent

5C3004

5C3004

10C3004

20C3004

20C3004

20C3004

20C3004

1

2

Cover

, V

ent Plate

20C3006

20C3006

20C3006

20C3006

13

Plate, Cover

, Filter

5C3002

5C3002

5C3002

20C3002

20C3002

20C3002

20C3002

14

Collar

, V

ent

5C3100

7C3100

10C3100

15C3100

15C3100

15C3100

20C3100

1

5

Air Filter 

Assembly

R2014701

R2014701

R2014703

R2014704

R2014704

R2014704

R2014705