Ventilation air, Supply piping, Condensate piping – Mammoth V-Cube Slim Split F-Series Sizes 830 and 840 User Manual

Page 11

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Mammoth V-Cube Slim Split IOM, MAMM-VCS-IOM-3FA (September 2013) 11

Figure 12: Clearances - Units Without Waterside Economizer

SERVICE CLEARANCE

FILTER ACCESS

36.0 [914]

42.0 [1067]

]

SERVICE CLEARANCE

Ductwork and Attenuation

Discharge ductwork is normally used with the V-Cube

Slim™. Return air ductwork may also be required.
All ductwork should conform to industry standards of

good practice as described in the ASHRAE Systems

Guide.
The discharge duct system will normally consist of a flex-

ible connector at the unit connection, a transition piece

to the full duct size, a short run of duct, and elbow with

vanes, and a trunk duct teeing into a branch duct with

discharge diffuses. The transition piece must not have

angles totaling more than 30° or severe reduction in air-

flow performance can result.
Do not connect the full duct size to the unit. Use a transi-

tion piece sized according to the discharge collar on the

unit to get to the full duct size. With metal duct material,

the sides of the elbow and entire branch duct should be

internally lined with acoustic fibrous insulation for sound

attenuation. Glass fiber duct board material is more

absorbing and may permit omission of the canvas con-

nector.
Return air ductwork (if used) should be connected to the

unit using the filter section flange.

Ventilation Air

Outside air may be required for ventilation. Refer to local

codes. The temperature of the ventilation air must be

controlled so that the mixture of outside air and return

air entering the unit is within application limits. It is rec-

ommended that the ventilation air inlet be closed during

unoccupied periods (i.e. night setback).
The ventilation air system is typically a separate building

subsystem with distribution ductwork. Simple introduction

of the outside air into each return air plenum chamber

reasonably close to the unit air inlet is recommended.

Do not duct outside air directly to the unit inlet. Provide

sufficient distance for the thorough mixing of outside and

return air.

Supply Piping

NOTE: Read all Supply Piping instructions before proceeding.

All units should be connected to supply and return piping

in a two-pipe, reverse-return configuration. A reverse-

return system is inherently self-balancing and requires

only trim balancing where multiple quantities of heat

pumps with different flow and pressure drop charac-

teristics exist in the same loop. Check for proper water

balance by measuring differential temperature reading

across the water connections.
Avoid dissimilar metal fittings as they may corrode. If the

use of dissimilar metals cannot be avoided, use dielectric

isolation at that connection point
Supply and return shutoff valves are recommended at

each unit. A flow control device to limit fluid flow through

the unit should be connected to the water outlet.
No unit should be connected to the supply and return pip-

ing until the water system has been cleaned and flushed

completely. After the cleaning and flushing has taken

place, the initial connection should have all valves wide

open in preparation for the water system flushing.

Condensate Piping

Condensate piping can be steel, copper, or PVC. Each

unit includes a minimum of two stainless steel conden-

sate connections; one in each coil cabinet section.
The condensate disposal piping must be trapped. The

piping must be pitched away from the heat pump not less

than ¼” per foot. The unit is supplied with a 1-¼” male

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