Manifold Arrangements - Modine MDB Série Manuel D'installation Et De Maintenance

installation

manifold arrangements

WarninG
For indoor units, where required by Code, use a dedicated
line for venting gas to the outside of the building.
The standard ETL manifold arrangement is designed to meet
ANSI standards and is designed for a gas inlet pressure of 8" to
14" water column. Optional 1-5 psig manifolds are available.
All Modine Manufacturing standard ETL manifold options
comply to IRI safety requirements.
Controls supplied for IRI manifolds are in accordance with
correspondence received from Industrial Risk Insurers dated
November, 1995.
Optional manifold arrangements are available to comply with
Factory Mutual (FM) requirements.
Fm manifolds
All Modine Manufacturing standard ETL manifolds up to
and including 2,500,000 Btu/Hr meet FM safety control
requirements.
Units required to comply with FM requirements that are
selected with manifold inputs greater than 2,500,000 Btu/Hr
require the selection of an optional FM manifold to satisfy FM
safety requirements.
For units selected to meet FM requirements, if there is to be
any form of blocked inlets in the entering air stream, such as
filters or inlet dampers (potential gas traps to the outside),
the optional FM with restriction manifold must be selected,
regardless of Btu/Hr input. Intake screens or vertical inlet
ductwork (above the unit inlet opening) are not considered
blockages, while inlet dampers are considered to be blockages.
The FM less restriction option may only be used when inlet
restrictions do not exist.
Controls supplied for FM manifolds are in accordance with
correspondence received from Factory Mutual dated November,
1995.
table 9.1 - component listing for Figures 9.1
through 9.4
ref. component
1 Auxiliary Gas Shut-Off Valve
2 Combination Main Gas Valve
3 High and Low Gas Pressure Switch
4 Main Air Flow Proving Switch
5 Main Gas Pressure Regulator
6 Main Gas Shut-Off Valve
7 Main Gas Valve
8 Modulating Valve
9 Motorized Main Gas Valve
10 N/A
11 Orificed Pilot Needle Valve
12 Pilot Gas Pressure Regulator
13 Pilot Gas Shut-Off Valve
14 Pilot Gas Valve
15 Plugged Test Port
16 Redundant Main Gas Valve
Figure 9.1 - typical manifold component arrangements
standard, iri, & Fm arrangement - up to 400,000 Btu/hr
15 15
6
START OF FACTORY
FURNISHED AND PIPED
COMPONENTS
*
5
2, 5, 11, 13, 14
* Required and field installed when gas pressure exceeds 14" wc (1/2 psi)
Figure 9.2 - typical manifold component arrangements
standard, iri, & Fm arrangement - over 400,000 Btu/h
and up to 720,000 Btu/hr
15
6
START OF FACTORY
FURNISHED AND PIPED
COMPONENTS
*
5
2, 5
15 13
* Required and field installed when gas pressure exceeds 14" wc (1/2 psi)
Figure 9.3 - typical manifold component arrangements
standard & iri arrangement - over 720,000 Btu/hr
Fm (less & With restriction) - up to 2,500,000 Btu/hr
5
START OF FACTORY
FURNISHED AND PIPED
COMPONENTS
6
13
15 12
Figure 9.4 - typical manifold component arrangements
Fm (less & With restriction) - over 2,500,000 Btu/hr
START OF FACTORY
FURNISHED AND PIPED
COMPONENTS
6
5
13 14
15 12
The manifold arrangements shown in Figures 9.1 through 9.4
are typical and may not match the unit supplied. Refer to the
manifold piping diagram that shipped with the unit for actual
arrangement.
7-500.10
1 15
8
12
1
8
15
16
15
12 14 11
16
7
15 1 15
8
14 11
3
9 16 1
1 1 2 8
15 15
For FM Less Restriction:
j Solenoid Valve replaces Motorized Valve
11
k Not Required
4
4
15
4
15
4
15
9 9