Gas Line Leak Testing; Electrical Wiring - State Water Heaters 301 Series Instruction Manual

GAS LINE CONNECTION
1. The water heaters covered by this manual are shipped from the
factory with 3/4 inch supply gas connections. The supply gas
line must not be smaller than 3/4 inch. Connect the supply gas
line to the water heater's 24-volt gas valve in accordance with
all applicable local and national code requirements.
2. Depending on the developed equivalent length and/or the
number of appliances connected to a common main, the size
of the supply gas line may have to be increased, see
(page 40). If the supply gas line must be resized larger
Sizing
to accommodate increased supply gas line lengths or multiple
appliances use reducer couplings and short pipe nipples to
increase the supply gas line.
Note: Make the transition to the larger supply gas line as
close to the supply gas connection as possible.
3. Apply thread sealing compounds (pipe dope/Teflon tape)
sparingly and only to the male threads of the pipe joints. Do
not apply sealing compound to the first two threads. Use pipe
dope or Teflon ® tape marked as being resistant to the action of
liquid petroleum (LP/propane) gases.
LOW GAS PRESSURE
SWITCH
COMBUSTION
BLOWER
Figure 55. Supply Gas Line Connection
4. Use only a smooth jaw adjustable wrench as a back up on the
body of the 24-volt gas valve when tightening the first pipe
nipple into the body of the valve. DO NOT use a standard
pipe wrench (Stillson wrench) with metal tooth jaws as this may
permanently damage the valve.
5. Use a standard pipe wrench (Stillson wrench) as a back up
on the first pipe nipple installed above when connecting other
fittings and pipe in the supply gas line to prevent the 24-volt
gas valve on the water heater from twisting during installation.
6. To prevent damage, care must be taken not to apply too much
torque when connecting the supply gas line to the water heater.
7. Install a sediment trap as shown in
8. Install a Main Gas Shutoff valve in the supply gas line as shown
in (page 40).
Figure 54
Note: If overheating occurs or the gas supply fails to shut
off, turn off the Main Gas Shutoff valve to the water
heater.
Gas Line
SUPPLY GAS CONNECTION
FACTORY INSTALLED
TEE FITTING
(page 40).
Figure 54
41

GAS LINE LEAK TESTING

Any time work is done on the gas supply system perform a leak
test to avoid the possibility of fire or explosion.
Fire and Explosion Hazard
1. For test pressures exceeding 1/2 psi (3.45 kPa) disconnect
the water heater and its Main Gas Shutoff Valve from the gas
supply piping system during testing, see
The gas supply line must be capped when disconnected from
the water heater.
2. For test pressures of 1/2 psi (3.45 kpa) or less, the water heater
need not be disconnected, but must be isolated from the supply
gas line by closing the Main Gas Shutoff Valve during testing.
3. Paint all supply gas line joints and connections upstream of the
water heater with a rich soap and water solution to test for leaks.
Bubbles indicate a gas leak. Do not use matches, candles, flame
or other sources of ignition for this purpose.
4. Repair any leaks before placing the water heater in operation.
PURGING
Gas line purging is required with new piping or systems.
Purging should be performed per the current edition of
or
National Fuel Gas Code CAN/CSA B149.1 Natural Gas and Propane
.
Installation Code

ELECTRICAL WIRING

All electrical work must be installed in accordance with the
,
Electrical Code ANSI/NFPA 70
and local requirements.
C22.1
When installed, the water heater must be electrically grounded in
accordance with local codes or, in the absence of local codes, with
the ,
National Electrical Code ANSI/NFPA 70
, C22.1.
Code CSA
If any of the original wire as supplied with the water heater must
be replaced, it must be replaced with 105°C rated wiring or its
equivalent, except in the burner housing. In this case 200°C rated
wire must be used.
DEDICATED POWER WIRING AND BREAKERS
Dedicated power supply wires, neutral wires, ground wiring, and
dedicated circuit breakers often prevent electrical line noise and
are required when installing the water heater.
Note: This water heater should not be connected to
an electrical supply with a Ground Fault Circuit
Interrupter (GFCI) or Arc Fault Circuit Interrupter
(AFCI) with Integral GFCI protection as defined in
, and
NFPA 70 CSA C22.1
Use joint compound or Teflon tape
compatible with propane gas.
Leak test gas connections before
placing water heater in operation.
Disconnect gas piping at main
gas shutoff valve before leak
testing heater.
Install sediment trap in
accordance with NFPA 54 or
CAN/CSA B149.1.
(page 40).
Figure 54
NFPA 54
National
or the
Canadian Electrical Code
or the
Canadian Electrical
.
UL 943
the
,
CSA