Installation Of The Gas Line To The Heater - Modine Manufacturing MRL Series Installation And Service Manual

MRL Series

Installation of the Gas Line to the Heater

Install a sediment trap / drip leg in the supply line at the lowest spot prior to the gas ball valve. The trap
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length shall be at least three inches long. Ideally, the trap would be installed as close as possible to the
shut off. NOTE: For high pressure gas above 14" W.C., a high pressure regulator and ball valve must be
utilized and located upstream of the flex connector.
Install manual shut off ball valve with optional 1/8" NPT. Test connection towards the supply line. The
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manual shut off ball valve must be located within 6 feet of the appliance's service access door.
Install the 5/8" flare to ½" NPT adapter piece downstream of the gas valve as shown in Figures 3.14-
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3.15. 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.
Form the 1/2" x 24" stainless steel flexible gas connector into a smooth C-shape, allowing approximately
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12 inches between the flexible connector's end nuts (see Figure 3.14). The connector must reach from
the gas supply to the appliance without stretching, kinking, or twisting.
Attach the flexible connector to the 5/8" flare adapter on the gas line and the other end to the 5/8" flare
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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.
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 3.14 • Gas Connection (Flexible Gas Connection Shown)
NOTE: Do not exceed 14" W.C. to the appliance.
Adapter
2" max displacement
12"
Heater Movement
Adapter
Stainless Steel Gas Connector,
formed into smooth C-Shape
In Canada, the infrared heater shall only be connected with a Type I hose connector that is (a) certified as
being in compliance with the Standard for Elastomeric Composite Hose and Hose Couplings for Conducting
Propane and Natural Gas, CAN/CGA 8.1 ; and (b) of a length of 36 ± 6 in (90 ± 15 cm).
CAUTION
!
Ball Valve / Inlet Tap
Drip Leg/
Sediment Trap
SERVICE ACCESS PANEL
IGNITER & FLAME SENSE COMPARTMENT
1. Turn off gas & electricity.
2. Remove cover by lifting top
cover upward and outward.
CAUTION: HOT SURFACE.
KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.
Burner
Control Box
3.0 Installation • Installation of the Gas Line to the Heater
Ball Valve / Inlet Tap
Burner Control Box
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45°
45°
Horizontal
Remove cap to clean
sediment trap