background image

PRODUCT DATA

60- 2026- 10

® U.S. Registered Trademark
Copyright © 2000 Honeywell •  All Rights Reserved 

C7027A, C7035, C7044A, C7927A

Minipeeper® Ultraviolet Flame Detectors

APPLICATION

The C7027A, C7035A, C7044A and C7927A Minipeeper® 
Ultraviolet Flame Detectors detect the ultraviolet radiation 
emitted by combustion flames. The flame detectors are used 
with Honeywell flame safeguard controls to provide flame 
supervision for gas, oil, or combination gas-oil burners.

FEATURES

C7027A, C7035A, and C7044A Flame Detectors are 
used with R7249A, R7290A, R7749B and R7849A,B 
Amplifiers and the appropriate Honeywell controls.

C7044A may also be used with the following 50 Hz 
Honeywell combustion controls/amplifiers:

R4341/R7323

R4343/R7323

R4344/R7323

C7027A has an integral collar threaded (internal 
1/2-14 NPSM) for mounting on a one-half-inch sight 
pipe.

C7035A has an integral collar threaded (internal 
1-11-1/2 NPSM) for mounting on a one-inch sight pipe.

C7035A housing meets Underwriters Laboratories Inc. 
requirements for rain tightness and complies with 
NEMA enclosure standards, types 4 and 4X.

C7044A mounts with a two screw bracket. The UV 
sensor tube is enclosed in a stainless steel housing.

C7044A has the capability of side or end viewing in 
flame monitoring applications.

Because of their compact size, the C7027A and 
C7044A are particularly suitable for blast tube 
mounting.

Properly installed, the C7027A and C7035A are 
pressure rated for 5 psi.

C7035A ultraviolet radiation sensor tube is field 
replaceable.

Two C7027A, C7035A or C7044A Flame Detectors can 
be wired in parallel for difficult flame sighting 
installations.

C7927A is used with only the R7851B Flame Amplifier 
and the appropriate Honeywell controls.

C7927A has an integral collar threaded (internal 
1/2-14 NPSM)  for mounting on a one-half inch sight 
pipe.

C7027A

C7035A

C7044A

C7927A

Contents

Application ........................................................................

1

Features ...........................................................................

1

Specifications ...................................................................

2

Ordering Information  ........................................................

2

Installation ........................................................................

4

Wiring (All Models—Fig. 10) .............................................

8

Adjustments and Checkout  ..............................................

9

Troubleshooting ................................................................ 12
Maintenance ..................................................................... 12

Summary of Contents for Minipeeper C7027A

Page 1: ...nting on a one inch sight pipe C7035A housing meets Underwriters Laboratories Inc requirements for rain tightness and complies with NEMA enclosure standards types 4 and 4X C7044A mounts with a two screw bracket The UV sensor tube is enclosed in a stainless steel housing C7044A has the capability of side or end viewing in flame monitoring applications Because of their compact size the C7027A and C7...

Page 2: ... rated for 221 F 105 C C7027A1064 has 24 ft 7 32 m leadwires Rear of detector has a clamp type connector for 1 2 in flexible metallic conduit Models are available with 1 2 in internally threaded spud connector instead of the clamp C7027A1114 has 44 in 1 118 m leadwires and 22 in 558 mm flexible conduit Dimensions See Fig 1 Replacement Part 129685 Flange Gasket NOTE The ultraviolet radiation sensin...

Page 3: ...ls C7027A1056 C7035A1049 C7035A1064 Accessory 118367A Swivel Mount provides adjustable positioning of the C7027A or C7035A Fig 3 Installation dimensions of C7044A in in mm C7044A Minipeeper Ultraviolet Flame Detector Flame Detection Housing has two openings to permit either side or end viewing Side viewing is 1 8 as sensitive as end viewing Mounting Bracket included in 4074BVK Bag Assembly secured...

Page 4: ... hours of continuous use within the flame detector s specified ambient temperature and voltage ratings Wearout of an ultraviolet radiation sensing tube results in failure of the UV sensor to properly discriminate between flame conditions The C7027A C7035A and C7044A Flame Detectors should only be used on burners that cycle on off periodically or in the absence of cycling are periodically checked f...

Page 5: ...ng the axis of the pilot flame The smallest pilot flame that can be sighted must be capable of igniting the main burner see Pilot Turndown Test page 9 2 Main flame only Sighting must be at the most stable part of the flame for all firing rates 3 Pilot and main flame Sighting must be at the junction of both flames Other Radiation Sources Sensed By The UV Detector Examples of radiation sources other...

Page 6: ...prayed on the body of the detector use a C7035A Internal threads in its base permit the use of waterproof flexible conduit for this type of application Prepare Hole In Wall Of Combustion Chamber Cut a hole of the proper diameter for the sight pipe in the wall of the combustion chamber at the selected location Flare the hole to leave room for small adjustments of the sighting angle The taper of the...

Page 7: ...separately onto the sight pipe before mounting the detector Fig 6 Mounting a C7027A or C7927A on a combustion chamber viewed from above C7035A mounting is similar Fig 7 Mounting dimensions of 136733 Heat Block in in mm Mounting a C7044A On a Blast Tube Fig 9 The C7044 is designed to be mounted on the blast tube of a burner The exact location should be determined by the burner manufacturer Contact ...

Page 8: ...properly supervise the combustion flame 1 Disconnect power supply before beginning installation to prevent electrical shock and equipment damage All wiring must comply with applicable electrical codes ordinances and regulations Use NEC Class 1 wiring 2 If the leadwires are not long enough to reach the terminal strip or wiring subbase make the required splices in a junction box 3 If splicing is nec...

Page 9: ...al location or before tightening the C7044A clamp screw complete both the adjustments and checkout tests that follow and any required by the burner manufacturer Uv Sensor Tube Test NOTE For initial burner lightoff consult the burner manufacturer instructions or the instructions for the flame safeguard control During the initial burner lightoff make sure the flame safeguard control starts i e the l...

Page 10: ... or voltage reading is desirable The flame signal must be above the minimum acceptable level for the flame safeguard control and associated amplifier as indicated in Table 1 Measure the flame signal for the pilot alone the main burner flame alone and both together unless monitoring pilot only when using an intermittent pilot or supervising the main flame only when using direct spark ignition Also ...

Page 11: ... the leads on the Q624 or Q652 Response to Other Ultraviolet Sources Some sources of artificial light produce small amounts of ultraviolet radiation Under certain conditions an ultraviolet detector will respond to them as if it is sensing a flame Do not use an artificial light source to check the response of an ultraviolet detector To check for proper flame detector operation test for flame failur...

Page 12: ...ll of the combustion chamber and the detector c add a shield or screen to reflect radiated heat away from the detector or d add cooling refer to Sight Pipe Ventilation page 6 4 Remove the detector and clean the viewing window with a soft clean cloth 5 Clean the inside of the sight pipe if one is used before reinstalling the detector 6 If the flame signal continues to be too low replace the plug in...

Reviews: