By-Pass Sizing Calculator

Often with zoning systems a By-Pass is needed to relieve excess air when only a small zone or number of small zones cannot deliver the required air flow thru the HVAC System. A by-pass is often ducted back into the return air or into non-critical, common conditioned temperature areas such as entry ways, hallways, basements, etc.

Select your Maximum Total System Cubic Feet per Minute (CFM), then enter the CFM of your Smallest Zone to calculate the type of By-Pass Damper you require.

Note: If the By-Pass CFM amount is 30% or less of the Total System CFM, No By-Pass is required.

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SPRD08

The By-Pass Damper you are looking for is SPRD08.

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SPRD09

The By-Pass Damper you are looking for is SPRD09.

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SPRD10

The By-Pass Damper you are looking for is SPRD10.

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SPRD12

The By-Pass Damper you are looking for is SPRD12.

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SPRD14

The By-Pass Damper you are looking for is SPRD14.

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SPRD16

The By-Pass Damper you are looking for is SPRD16.

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RDM18-SPC

The By-Pass Damper you are looking for is RDM18 w/SPC.

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RDM20-SPC

The By-Pass Damper you are looking for is RDM20 w/SPC.

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ZDSM2020-SPC

The By-Pass Damper you are looking for is ZDSM2020 w/SPC.

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ZDSM2420-SPC

The By-Pass Damper you are looking for is ZDSM2420 w/SPC.

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ZDSM3024-SPC

The By-Pass Damper you are looking for is ZDSM3024 w/SPC.

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MMP2 – Single Stage Zone Control Panel


Description

Model: MMP2 (Plug-in-Play)

The Mini-MasterZone 2 Zone panel is an economical 2 zone only panel for single stage heating and cooling systems. Compatible with any 4/5 wire (Y-G-R-C-W) thermostats, this panel is the simplest zoning system yet, needed with Hydro-Air and electric Heating systems. Built-in LEDs indicate system status and indicators to show each zone’s call.  This panel features NEW color coded screw-less terminal blocks making wiring quick and simple.

The MMP2 controls only the New Plug-In Dampers.

When any zone calls for heating (or cooling), the panel accepts the first call, opens the damper to the calling zone, closes the dampers to the satisfied zones and activates the HVAC Unit. Any calls for the same mode, heating or cooling, will have their zone damper open and receive conditioned air. If an opposite call is made during this time, it will be held until the first mode calling is either satisfied or a maximum of 20 minutes expires, which then after an approximate 2 minute purge time, will switch over and satisfy the opposite call. Once all heating and cooling calls are satisfied the panel will accept fan only calls and cycle the dampers to supply air only to those zones with the Fan switch in the ON position. If there are no heat, cool or fan only calls, all dampers return to the open position.

  • Also available with By-Pass Eliminator (MMP2B) or with Kit (MMP2BK – includes BPE, ZPS and T24)

MMP2 Installation & Operating Instructions