10
ELECTRICAL
It is important that the electrical power is not turned on at this time. Double check all connections and then
turn the power on. The display that is provided with the Munchkin should now be reading the outlet
temperature. Note: see Part 6/Startup Procedure section in the manual to change the temperature setting
or run the heater.
PART 3. GAS CONNECTION
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than 14” water column (350 mm), ½ pound
pressure (3.5 kPa), and a minimum of 3.5” water column. The entire piping system, gas meter and
regulator must be sized properly to prevent pressure drop greater than 0.5” as stated in the National
Fuel Gas Code. This information is listed on the rating plate.
It is very important that you are
connected to the type of gas as noted on the rating plate.
“LP” for liquefied petroleum, propane gas
or, “Nat” natural or city gas. All gas connections must be approved by the local gas supplier, or utility
in addition to the governing authority, prior to turning the gas supply on. The nipple provided for the
399VWH is 1
1
/
4
” with a mandatory 1 x 1
1
/
4
reducing coupling (provided). Threaded into the branch of
a 1
1
/
4
” tee and a drip leg fabricated as per the national fuel gas code. The 199VWH has a
3
/
4
” gas supply
nipple with a
1
/
2
x
3
/
4
reducing coupling (provided) which is to be threaded into the branch of a
3
/
4
” tee.
You must ensure that the entire gas line to the connection at the Munchkin is no smaller than 1
1
/
4
”
for the 399VWH and
3
/
4
” for the 199VWH.
Once all the inspections have been performed, the piping
must be leak tested. If the leak test requirement is a higher test pressure than the maximum inlet
pressure, you must isolate the Munchkin from the gas line. In order to do this, you must shut the gas
off using factory and field-installed gas cocks (following the lighting instructions in Part 6 Section B.)
This will prevent high pressure. Failure to do so may damage the gas valve. In the event the gas valve
is exposed to a pressure greater than
1
/
2
PSI, 14” water column, the gas valve must be replaced.
Never
use an open flame (match, lighter, etc.) to check gas connections.
*NOTE: The tank sensor is used only on single Munchkin, single tank applications. For multiple
applications, a mechanical control must be used.
n
WARNING
Failure to follow all precautions could result in fire, explosion or death!
