Service manual

ROBERTS-GORDON SECTION 9: VENTING AND DUCTING pg 21
Section 9. Venting and Ducting
General Requirements
Heater must be vented in accordance with the proper
national and local codes. Partial information relating to
these specifications is provided in this section with regard
to size and configurations for venting arrangements.
United States: refer to ANSI Z223.1 - latest revision.
Canada: refer to CAN/CGA-B149.1 and B149.2
The pump may vent to the outdoors either vertically or
horizontally (see Figures 21 & 22). For horizontal venting:
1. Vent must exit building not less than seven feet (2.1 m)
above grade when located adjacent to public walkways.
2. Vent must terminate at least three feet (1 m) above
any forced air inlet located within ten feet (3 m).
3. Vent shall terminate at least four feet (1.2 m) below,
four feet (1.2 m) horizontally from or one foot (0.3 m)
above any door, window or gravity air inlet into
building.
4. Locate vent terminal at least 12 inches (30 cm) from
any opening through which vent gases could enter a
building.
5. Use only corrosion resistant materials for the
discharge line from the pump to the point of discharge.
6. Vent terminal opening must extend beyond any
combustible overhang.
7. Install vent terminal at a height sufficient to prevent
blockage by snow.
8. Protect building materials from degradation by flue
gases.
9. Any portion of flue pipe passing through a combustible
wall must be dual insulated or an approved thimble
must be used.
Manifold Pipe Requirements
Manifold pipe, when specified on the layout drawing, is
used to connect radiant tubing to the vacuum pump.
When more than one burner is connected to a pump, a
special connection point is utilized, such as a cross or tee
section (see Figure 19). It is recommended that 4" O.D.
(10 cm) aluminized or coated tubing be used for manifold
pipe. Reflectors are not required, but may be used over
manifold pipe. Manifold pipe must be supported properly,
with at least one tube and reflector hanger per 10 ft. (3m)
section.
Maximum manifold pipe lengths are:
From end of radiant tubing section to connection point
junction:
• 20 ft. (6 m) for EV-80, EV-110, and EV-140 burners.
• 30 ft. (9 m) for EV-170 and EV-200 burners.
From connecting point junction to vacuum pump inlet:
• 10 ft. (3 m) for all burners
Venting the Vacuum Pump
The exhaust connection from the vacuum pump is 4" (10
cm) diameter.
Connect one of the flexible isolation boots
provided to the flue pipe. Connections to flue pipe larger
than 4" O.D. (10 cm) require use of an appropriate “taper
pattern reducer” (not supplied).
Figure 19. Tailpipe Connection Points
20"
10"
20"
20"
Porcelain Coated Cross
P/N 0133092D
Aluminized Steel Cross
P/N 01330903
Porcelain Coated Tee
P/N 0133022D
Aluminized Steel Tee
P/N 01330203
Carbon Monoxide Hazard
Vented heaters must be vented outdoors.
Vented heaters must be installed
according to the installation manual.
Failure to follow these instructions will
result in death or injury.
WARNING