Honeywell Q348A- User Manual

PILOT BURNER/IGNITER-SENSOR
MUST BE RIGIDLY POSITIONED
RELATIVE TO MAIN BURNER

M3271

G. S. • Rev. 7-93 • ©Honeywell Inc. 1993 • Form Number 60-0653—8

Q345A, Q348A, Q348B, Q362A,Q373A

and Q381A Pilot Burner/Igniter-Sensors

Application

These pilot burner/igniter-sensors provide pilot flame

ignition and sensing in intermittent pilot systems. They
consist of a target type pilot burner with a combination
spark igniter and flame sensor mounted in place of the
thermocouple.

Installation

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to

follow instructions can damage product or cause a
hazardous condition.

2. C h e c k r a t i n g s g i v e n i n i n s t r u c t i o n s a n d o n

product to make sure product is suitable for your
application.

3. Make sure installer is a trained, experienced

service technician.

4. A f t e r c o m p l e t i n g i n s t a l l a t i o n , u s e t h e s e

instructions to check out product operation.

WARNING

FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH.
Follow these warnings exactly:
1. Disconnect power supply before wiring

to prevent electrical shock or equipment
damage.

2. To avoid dangerous accumulation of fuel

gas, turn off gas supply at appliance service
v a l v e b e f o r e s t a r t i n g i n s t a l l a t i o n a n d
perform Gas Leak Test after completion of
installation.

3. Do not bend pilot tubing at the control or

p i l o t a f t e r c o m p r e s s i o n n u t h a s b e e n
tightened. Gas leakage at the connection may
result.

Follow appliance manufacturer instructions if avail-

able; otherwise, use instructions provided below.

LOCATION

1. Position pilot burner/igniter-sensor for easy

access and observation. In replacement applications,
replace pilot burner/igniter-sensor with an identical unit
and position new pilot burner/igniter-sensor in the same
location and orientation as the original one.

Fig. 1—Mount pilot burner/igniter-sensor on
main burner.

PILOT BURNER/
IGNITER-
SENSOR
JUST RIGHT

PILOT BURNER/
IGNITER-
SENSOR
TOO LOW

PILOT BURNER/
IGNITER-
SENSOR
TOO HIGH

MAIN BURNER
FLAME WILL
IMPINGE ON
IGNITION-
SENSOR

IGNITION
FLAME WILL
IMPINGE ON
MAIN BURNER

IGNITION FLAME
JUST MISSES
MAIN BURNER

M3273

Fig. 2—Location of pilot burner/igniter-sensor.

2. Mount pilot burner/igniter-sensor on main burner.

Mounting surfaces other than the main burner may shift,
bend, or warp as furnace expands and contracts while
operating. See Fig. 1.

3. Mount pilot burner/igniter-sensor so the pilot flame

remains properly positioned with respect to the main
burner flame. See Fig. 2.

4. S u p p l y p i l o t f l a m e w i t h a m p l e a i r f r e e o f

combustion products.

5. Do not impinge pilot flame on adjacent parts.

Do not impinge main burner flame on pilot burner/
igniter-sensor.

6. Do not expose pilot flame to falling scale, which

could impair main burner ignition.

7. Do not expose pilot burner/igniter-sensor to main

burner rollout while igniting or extinguishing.

8. Do not expose pilot flame to drafts that push or

pull pilot flame away from the igniter-sensor.

NOTE: The Q381A Pilot Burner/Igniter-Sensor is for

horizontal mounting only. Mounting bracket must
remain vertical.