Gas Connections - Lochinvar TNR-I&S-02 Installation & Service Manual

TNR-I&S-02

GAS CONNECTIONS

Connect this water heater only to the type of gas as shown on the
rating plate. Use clean black iron pipe or equivalent material approved
by local codes and ordinances. (Dirt and scale from the pipe can enter
the gas valve and cause it to malfunction). The inlet gas line must
have at least a 3 inch (7.62 cm) drip leg (sediment trap) installed as
close to the water heater's gas valve as possible. A ground joint union
must be installed in the gas supply line, as close to the water heater as
possible, to permit servicing of the water heater. Compounds used on
the threaded joints of the gas piping must be resistant to the action of
liquefied petroleum gases/propane gas. DO NOT apply pipe dope to
the gas valve inlet and make certain that no pipe dope has become
lodged in the inlet screen of the gas valve. Extreme care must be
taken to ensure no pipe dope enters the gas valve and to avoid
excessive torque when tightening the gas supply line to the gas valve.
Excessive torque may result in cracking of the gas valve housing. The
suggested maximum torque is 31.5 foot lbs. (4.4 kg-m). The
manufacturer of this water heater will not be liable for any damage or
injury caused as a result of a cracked gas inlet as a result of excessive
torque.
This water heater and its gas connection must be leak tested before
placing the water heater in operation. Check for gas leaks with a soap
and water solution and a brush or a commercial leak detector fluid.
NEVER USE A MATCH OR OPEN FLAME FOR TESTING!
The water heater is not intended for operation at higher than 14.0 inch
water column (½ psi) supply gas pressure. Higher gas supply pressures
require supplemental reducing service regulation. Exposure to higher
gas supply pressure may cause damage to the gas controls which
could result in fire or explosion. If overpressure has occurred such as
through improper testing of gas lines or emergency malfunction of the
supply system, the gas valve must be checked for safe operation.
Make sure that the outside vents on the supply regulators and the
safety vent valves are protected against blockage. These are parts of
the gas supply system, not the water heater.
The water heater and individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of the
system at test pressures in excess of ½ psi (3.5 kPa). The water
heater must be isolated from the gas supply piping system by closing
its manual shutoff valve during any pressure testing of the gas supply
system at test pressures equal to or less than ½ psi (3.5 kPa). The
supply line must be capped when not connected to the water heater.
If copper supply lines are used, they must be internally tinned and
certified for gas service.
WARNING
CAUTION
Figure 22
The gas supply lines must meet all requirements of the National Fuel Gas
Code ANSI Z223.1 (Latest Edition), or in Canada CAN/CGA B149.1 Natural
Gas Installation Code (Latest Edition) or CAN/CGA B149.2 Propane
Installation Code (Latest Edition).
GAS METER SIZE – NATURAL GAS ONLY
Be sure that the gas meter has sufficient capacity to supply the full rated
gas input of the water heater as well as the requirements of all other gas
fired equipment supplied by the meter. If the gas meter is too small, ask
the gas company to install a larger meter having adequate capacity.
GAS PRESSURE REGULATION
Main line gas pressure to the water heater should be between a maximum
14.0 inch W.C. and a minimum supply pressure as shown on the rating
plate. The inlet gas pressure must not exceed the maximum value.
BEFORE PLACING THE WATER HEATER IN OPERATION, CHECK FOR GAS
LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER MATERIAL ACCEPTABLE
FOR THE PURPOSE OF LOCATING GAS LEAKS.
DO NOT USE MATCHES, CANDLES, FLAME OR OTHER SOURCES
OF IGNITION FOR THIS PURPOSE.
ELECTRICAL CONNECTIONS
Turn off or disconnect the electrical power supply to the water heater
before servicing. Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.
All electrical wiring must be installed and grounded in accordance with
local codes, or in the absence of local codes, the National Electrical
Code, ANSI/NFPA 70 and/or CSA C22.2 Electrical Code.
The water heater must be wired to a 120 VAC, 60 Hz, 15A power supply.
The water heater should be connected to a GFI outlet and wired on a
separate circuit and breaker. If a flexible line cord and plug is permitted
by local code, then provide a three wire GFI grounding type receptacle
within reach of the line cord provided on the control box. DO NOT plug
the line cord into a receptacle that can have the power supply interrupted
by a switch that is used to control lights or another appliance.
1 4
Drip Leg
WARNING
WARNING