Specifications

Specifications
Specification Value
MH Fluid Cooler — Specifications: Options
27
requires no oil changes for the first five
(5) years of operation. The gearbox bear-
ings shall be rated at an L
10A
service life
of 100,000 hours or greater. The gear
sets shall have AGMA Quality Class of 9
or greater.
Ultra Quiet Fan: MHF7107 only.
7. 1 Replace paragraph 7.1 with the follow-
ing: Fan(s) shall be axial design, incorpo-
rating wide-chord acoustic geometry, cor-
rosion and fire resistant marine grade alu-
minum blades and aluminum hubs. Blades
shall be resiliently mounted to fan hub and
individually adjustable. Fan(s) shall be driv-
en through a one-piece multi-groove, solid
back V-type belt, sheaves (pulleys), and
tapered roller or deep groove ball bear-
ings. Bearings shall be rated at an L
10
life
of 90,000 hours, or greater. Both motor
and fan sheaves (pulleys) shall be all cast
aluminum to prevent premature corrosion.
Dry Cooling Operation:
4.2 Add the following in the Coil section:
An extended surface tube bundle shall be
included in the plenum section of the fluid
cooler to enable part-load seasonal dry
operation. The finned tube bundle shall be
constructed of fully welded box headers
and finned tube circuits, and shall be hot-
dip galvanized after fabrication. Minimum
design operating pressure shall be 150
psi. The coil shall be warranted against
any failure caused by defects in materials
and workmanship for a period of eighteen
(18) months from the date of shipment.
Extended Geareducer Lube-Line with
Dipstick:
7. 1 Add the following paragraph to the
Mechanical Equipment section:
An
external oil level dipstick shall be located
adjacent to the motor at the fan deck
surface and shall be accessible from a
portable maintenance ladder.
Fan Cylinder Extension:
7. 1 Add the following paragraph to the
Mechanical Equipment section:
Fan
cylinder extensions shall be provided to
elevate the fan discharge to a height of
___ ft above the fan deck level.
Water
Distribution
System
Coil
Eliminators
Hot Fluid In
Redistribution Pump
Cold Fluid Out
MX75 Fill
Coil Louvers
Warm Air
Warm Air
Air In
Air In
Finned Tube
Bundle
(optional)
■ For more severe cases requiring the lowest possible sound levels, inlet sound
attenuator sections and/or the Marley “Ultra Quiet” fan may offer additional
sound reduction. The Ultra Quiet fan is available on MHF7107 models only.
Tower dimensions may increase slightly, obtain current sales drawings from your
Marley sales representative for accurate dimensions.
■The dipstick option is accessible from a portable maintenance ladder on one
and two cell installations only. Maintenance considerations recommends this
option be combined with the ladder and guardrail option on installations of
three or more cells since the dipstick cannot be reached without accessing the
fan deck.
■Extensions are available in 1'-0 increments to a maximum height equal to the
diameter of the fan. Such extensions may be considered necessary in order to
elevate the discharge beyond the bounds of an enclosure. Discuss applicability
with your local Marley sales representative.