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—
4
—
LOCK-OUT
TAG
ON
OFF
MAIN
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
Fig. 3 — To Shut Unit Off
TWO-STAGE GAS VALVE
SINGLE-STAGE VALVE
M1
P3
C2
O
F
F
ON
WR
O
F
F
ON
C
HI
M
R
E
P
L
A
C
E
S
C
R
E
W
L
O
3-Phase Models
581B036-072072
581B036-072115
581B048-072150
581B090-102125
581B090-120180
581B090-150224
581B120-150250
California Compliant 3-Phase
581B036-060071
581B036-060114
581B048,060149
Single Phase
581B036-060072
581B036-060115
581B048,060150
Low NO
x
581B036-060060N
581B036-060090N
581B048,060120N