Raypak 337A, 406A, 206A, 407A, 336A B149.1 and B149.2, Gas Supply Connections, Draft Hood Heater

The discharge opening must be a minimum of 2 ft ver- tically from the roof surface and at least 2 ft higher than any part of the building within 10 ft. Vent stack shall be at least 5 ft in vertical height above the drafthood out- let. The vent cap location shall have a minimum clear- ance of 4 ft horizontally from, and in no case below, unless a 4 ft horizontal distance is maintained, from electric meters, gas meters, regulators and relief equipment.

The weight of the vent stack or chimney must not rest on heater drafthood. Support must be provided in compliance with applicable codes. The heater top and drafthood must be readily removable for maintenance and inspection. Vent pipe should be adequately sup- ported to maintain proper clearances from combustible construction.

Type "B" double-wall or equivalent vent pipe is recom- mended. However single-wall metal vent pipe may be used as specified in the latest edition of the National Flue Gas Code ANSI Z223.1 (Canada - CAN/CGA-

B149.1 and B149.2).

GAS SUPPLY CONNECTIONS

Fig.# 8090.1

Gas piping must have a sediment trap ahead of the heater gas controls, and a manual shut-off valve locat- ed outside the heater jacket. All gas piping should be tested after installation in accordance with local codes.

10' OR LESS

VENT CAP

2' MIN

2' MIN

5' MIN

VENT PIPE

CAUTION: The heater and its manual shut-off valve must be disconnected from the gas supply during any pressure testing of that system at test pressures in excess of 1/2 psig (3.45 kPa). Dissipate test pressure in the gas supply line before reconnecting the heater and its manual shut off valve to gas supply line. FAIL-

URE TO FOLLOW THIS PROCEDURE MAY DAM- AGE THE GAS VALVE. OVER PRESSURIZED GAS VALVES ARE NOT COVERED BY WARRANTY. The heater and its gas connections shall be leak tested before placing the appliance in operation. Use soapy water for leak test. DO NOT use open flame.

DRAFT HOOD

HEATER

NOTE: Do not use Teflon tape on gas line pipe thread. A flexible sealant suitable for LP gases is recommended.

A minimum of 7 in. WC and a maximum of 14 in. WC upstream pressure under load, and no-load conditions must be provided for natural gas or a minimum of 12 in. WC and a maximum of 14 in. WC for propane

Fig.# 8119.2 gas.

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