Detroit Radiant Products Company LD3 Series - Manual (Page 36)

36
LD3 Series 3.0 Installation • Gas Supply
Ball Valve w/ 1/8” NPT Inlet Tap
NEUTRAL EARTH
HOT
- 120V HEATER INPUT -
120V
G W1 W2 R
12”
CAUTION
!
When using a stainless steel flexible gas connector, do not attach the connector nuts directly to the gas
pipe supply. Connector nuts must be installed to an approved adapter.
Figure 3.24 • Gas Connection (Flexible Gas
Connection shown) • Side View
Stainless Steel
Gas Connector
5/8” O.D. Flare to
1/2” NPT Adapter
Figure 3.25 • Gas Connection (Flexible Gas
Connection shown) • End View
2 in. max displacement
3 inch minimum
Drip Leg/
Sediment Trap
Heater Movement
Burner Control
Box Side View
Ball Valve w/
1/8” NPT Inlet Tap
Connect the main gas supply line with an approved flexible connector or, if the authority having jurisdiction
requires rigid piping, the use of approved swing joints may be used. If swing joints are utilized, the heater
must be allowed to freely expand and contract without causing undue stress on the gas pipe.
The heater shall not be connected to the building piping system with rigid pipe or semi-rigid metallic tubing,
including copper. When using such material, an intermediate connection device that allows for the heater
expansion must be used.
The gas outlet must be in the same room as the appliance is installed, and must be accessible. It may not
be concealed within or run through any wall, floor or partition. When installing the heater in a corrosive
environment (or near corrosive substances), use a gas connector suitable for the environment. Do not use
the gas piping to electrically ground the heater.
Installation of the Gas Line to the Heater
1 Install a sediment trap / drip leg in the supply line at the lowest spot prior to the gas ball valve. The trap
length shall be at least three inches long. Ideally, the trap would be installed as close as possible to
the shut off.
2 Install manual shut off ball valve with optional 1/8” NPT Test connection towards the supply line. The
manual shut off ball valve must be located within 6 feet of the appliance’s service access door.
3 Install the 5/8 inch flare to ½” NPT adapter piece downstream of the gas valve as shown in Figure
3.24. This piece is typically included with the flexible gas connector, loosely installed on one of the
flare nuts.
NOTE: Keep flare surfaces clean and free of sealing compounds. Only the pipe threads
require sealing compounds.
4 Form the stainless steel flexible connector into a smooth C-shape, allowing approximately 12 inches
between the flexible connector’s end nuts (see Figure 3.24). The connector must reach from the gas
supply to the appliance without stretching, kinking, or twisting.
5 Attach the flexible connector to the 5/8” flare adapter on the gas line and the other end to the 5/8”
flare on the heaters inlet pipe. DO NOT connect the connector flare nuts directly to pipe threads. Use
only the adapters provided. DO NOT kink, twist or over-torque the connector when installing.
45°
45°
Burner Control Box End View
5/8” O.D. Flare to
1/2” NPT Adapter