Crown Boiler Mega-Stor Instructions d'exploitation télécharger pdf (Page 7)

IV. ZONE DESIGN

IMPORTANT



section for information on sizing, piping and circulators for the Mega-Stor zone.

In designing the Mega-Stor zone piping system the following points should be considered:

1) Circulator or Zone Valve Zoning? - Circulator zones are usually a better choice. Zone valves have a relatively high

 

valve with a minimal delay in opening, such as a motorized type.

2) Priority Zoning - Priority zoning is used to divert all boiler output to the Mega-Stor when its zone calls for heat re-

gardless of any simultaneous calls for heat from space heating zones. Priority zoning can be done using a 3-way zone

valve, or by using a relay to de-energize the heating zones when the Mega-Stor calls for heat. See the Piping and Wiring

Sections for more information on these zone systems.

3) Use Worksheet 1 to size piping and select a circulator for the Mega-Stor zone. To do this:

  

  

to all zones (zone manifolds, etc.).

  

  

  

selected. Enter the result in column (d).

d) Total column (d). This is the total pressure drop for the Mega-Stor zone.

e) Use Table 4.1 or a circulator manufacturer’s literature to select a circulator which will develop the required

  

TABLE 4.1: SELECTING A CIRCULATOR

AVAILABLE HEAD (FT. W.C.)

Select a circulator which has an Available Head greater than the pressure drop calculated using Worksheet 3.

Circulator

Flow

8.0 GPM 12.7 GPM

Taco 007 8.2 5.8

Taco 008 9.8 4.2

Taco 0014 17.5 15.2

Grundfos UPS 15-42F 9.0 5.0

Grundfos UP 26-64F 21.0 16.0

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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Crown Boiler Mega-Stor Instructions d'exploitation Page 7