Munchkin 399M Installing, Operating & Maintaining page 10

removing the cap and installing the manometer. The gas pressure must remain between 7" and 14"
during stand-by (static) mode and while in operating (dynamic) mode. If an in-line regulator is used,
it must be a minimum of 10 feet from the Munchkin. It is very important that the gas line is prop-
erly purged by the gas supplier or utility. Failure to properly purge the lines or improper line siz-
ing, will result in ignition failure. This problem is especially noticeable in NEW LP installations and
also in empty tank situations. This can also occur when a utility company shuts off service to an area
to provide maintenance to their lines. This gas valve must not be replaced with a conventional gas
valve under any circumstances. As an additional safety feature, this gas valve has a flanged con-
nection to the Venturi and blower.
MUNCHKIN BURNERTECH GAS VALVE
INLET PRESSURE TAP
(NOTE: INLET GAS PRESSURE CAN
BE MEASURED TO ASSURE
PROPER GAS SUPPLY)
Failure to follow all precautions could result in fire, explosion or death!
C a b r o n C O p p m
M o n o x d i e
C a b r o n C O
2 %
D o i x d i e
Fig. 3-2
10
110 VOLT AC ELECTRICAL CONNECTION
THROTTLE ADJUSTER
(NOTE: IF FOR ANY REASON THE THROTTLE
NEEDS TO BE ADJUSTED,
IT IS VERY IMPORTANT THAT A " COMBUSTION
ANALYZER " BE USED TO ENSURE SAFE AND PROPER OPERATION
TURN THE ADJUSTER TO THE (+) TO INCREASE GAS
OR TO THE (-) TO DECREASE THE GAS SUPPLY.
THIS ADJUSTMENT COULD AFFECT THE CO/CO % LEVELS.
MAKE SURE THE LEVELS CORRESPOND TO THE CHART IN
FIG. 3-2 COMBUSTION SETTINGS)
WARNING
C O M B U
I H G H I F I R N G R A T E S a n d L
N t a r u l a G s a
o l w
0 – 2 0 p p m 7 0
8 1 - 2 / % – 9 1 - 2 / % 8 1 -
OUTLET PRESSURE TAP
(NOTE: A NEGATIVE READING WILL BE
MEASURED WHILE THE FAN IS
IN OPERATION)
2
S I T O N S E T I T N G S
O W I F I R N G R A T E S O N A L
h g i h
p p m – 1 3 5 p p m 0 –
2 / % – 9 1 - 2 / % 9 1 - 2 / %
GAS CONNECTION
VENTURI
L M O D E L S
P o r p a n e L P
o l w h g i
2 0 p p m 8 0 – 1 5 0
– 1 0 1 - 2 / % 9 1 - 2 / % –
Fig. 3-1
h
p p m
1 0 1 - 2 / %