Honeywell R4795A Manual page 7

Fig. 6—Flame detector wiring.
FLAME ROD
F
X
G
X
C7012 ULTRAVIOLET DETECTOR
C7027, C7035, OR C7044
1
ULTRAVIOLET FLAME DETECTOR
C7027, C7035, AND C7044 FLAME DETECTOR LEADS ARE COLOR
1
CODED BLUE AND WHITE. THE BLUE LEAD MUST BE CONNECTED
TO THE F TERMINAL AND THE WHITE LEAD MUST BE CONNECTED
TO THE G TERMINAL. THIS CIRCUIT IS DC AND THE UV SENSING
TUBE IS POLARITY SENSITIVE. REVERSING THE LEADS EVEN
MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE.
Mounting R4795 On Subbase
Make sure that the power supply is disconnected.
Loosen the thumbscrew and remove the cover (see Fig. 8).
Position the R4795 over the Q270 Subbase. Start all ten
mounting screws and tighten uniformly. These screws com-
plete electrical circuits (terminal 1 excepted) and hold the
R4795 to the subbase.
PHOTOCELL
F
X
G
X
BLUE
F
X
YELLOW
G
X
BLACK
POWER
BLACK
SUPPLY
BLUE
F
X
WHITE
G
X
M8686
Fig. 7—Alarm terminal connections.
ALARM TERMINALS (OPTIONAL)
N.O.
COM
N.C.
IF A LINE VOLTAGE ALARM IS USED, THE R4795 MUST BE
1
MOUNTED IN A SUITABLE ENCLOSURE.
POWER SUPPLY MUST MATCH THE ELECTRICAL RATINGS OF THE
2
ALARM. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CAUTION
Do not overtighten the mounting screws because
damage to the circuit board can result. Maximum
recommended torque is 10 lb-in. (1.13 N•m).
Replace cover and securely tighten thumbscrew.
Fig. 8—R4795 and Q270 Subbase.
Q270
SUBBASE
TERMINAL
BLOCKS
PURGE TIMER
7
R4795A
INSTALLATION
R4795
L1
(HOT)
ALARM
2 POWER
SUPPLY
LINE OR
L2
LOW VOLTAGE
ALARM
1
M8687
CAPTIVE MOUNTING
SCREWS (10)
SAFETY SWITCH
RESET BUTTON
IN COVER
COVER
THUMBSCREW
AMPLIFIER
M8688
60-2285—7