🚀 go-pugleaf

philb@techbook.com (Phil Biehl) said ...
> Hi. In examining my hydronic (hot water basboard) furnace, I find that
> it is divided up into three zones. What I'd like to do is put in
> electrically operated valves that controlled via a microcontroller and
> three separate thermostats, one for each zone. I need to find a source
> for these valves that will fit 7/8" copper piping. 12 Volt coils would
> be nice but not absolutely necessary. 

The following is provided as technical info only, other manufacturers
exist. Prices are provided as reference only, etc...

\begin{quote}

HVAC Controls - Hydronic Controls.

1. "Honeywell" ZONE VALVES
    for Controlling the Flow of Hot and Cold Water.

    Features:
    * Long Life, Synchronous Motor - Virtually noiseless operation, and
      a smooth-opening feature that prevents water hammer. Motor can be
      easily replaced by removing one screw without having to drain
      system.
    * Switch up to 5 valves with one 40VA transformer - Save on
      multiple transformer installations. Each V8043 is rated at
      7.7VA(X5+38.5VA).
    * Manual opener with automatic recycle - In case of power failure
      valve can be opened manually for emergency heat.  Valve will return
      to "Auto" position when power is restored.
    * Forged brass body - because the rubber ball seat rotates out of the
      way, sweat fittings is accomplished without disassembling the valve.
      This makes for a very durable body.
    * Three O-Ring seal - Chance of seal leakage is practically
      nonexistant.  No other zone valve provides the degree of protection
      against leaks.

    Valves consist of an actuator motor and valve assembly.  Compact
    construction allows this valve to fit most anywhere including under
    baseboards.  Integral auxiliary end switch permits the sequencing of
    auxiliary equipment.  Patented rotating rubber ball seat never seats
    twice in same position which allows for a long life seal.

    Specifications: End switch - 4.4 amps (26.4 amps inrush) Pilot duty -
    50VA@24V.  18" wire leads. Current draw - 3.2 amps.

    MFG. Part #: V8043E1004
    Series: E
    De-energized Position: Normally Closed
    Pipe Connection: 1/2" Sweat
    Control Circuit: 24/50-60hz
    Dealer Price: (1) $59.27, (3) $56.31

    MFG. Part #: V8043E1012
    Series: E
    De-energized Position: Normally Closed
    Pipe Connection: 3/4" Sweat
    Control Circuit: 24/50-60hz
    Dealer Price: (1) $63.32, (3) $56.99

    MFG. Part #: V8043E1020
    Series: E
    De-energized Position: Normally Closed
    Pipe Connection: 1" Sweat
    Control Circuit: 24/50-60hz
    Dealer Price: (1) $71.74, (3) $64.57


2. White Rodgers Hydronic Zone Controls

    * 2-Wire or 2-way compact zone valves for maximum system pressure of
      150 PSI
    * For 24 VAC baseboard units, fan coils, convectors, etc.
    * Controls feature an adjustable flow valve and a unique spanner nut
      construction which makes them ideal for heating and cooling systems
    * Design allows power head to be assembled directly to valve body with
      no "swing distances", making installation and servicing easier
    * 2-wire thermostat controls a non-synchronous torque motor to open
      valve
    * valves have 3/4" I.D. sweat fitting
    * L36-637 valve includes an auxiliary switch which provides a low
      voltage (.35A at 24V) circuit to control burner/chiller, and/or
      circulator
    * 40 degree F to 250 degree F water temperatures
    * 18" leads on L36-636, push on connectors on L36-637
    * Shipping weight 2.5 lbs.

    White Rogers part #: 13A01-102
    Time Cycle: Open 30 Sec., Close 20 Sec.
    Friction DV Factor: 6.0
    Equivalent Ft. of Tubing: 22
    Order Stock #: L36-636
    Dealer Price: $55.58

    White Rogers part #: 13A02-102
    Time Cycle: Open 30 Sec., Close 20 Sec.
    Friction DV Factor: 6.0
    Equivalent Ft. of Tubing: 22
    Order Stock #: L36-637
    Dealer Price: $64.32
\end{quote}

from pages 255-256, catalog 173,
"Johnstone Supply Wholesale Net Price Book, Spring 1992"
Johnstone Supply, Inc.
PO Box 3010
Portland, Or 97208
(two offices in NC, no other offices listed)

It appears that hydronic systems are sensitive to pressure drops.  I
know that some designs have no circulator pumps.

Caution: Copper pipe is sold by both inside (ID) and outside diameter
(OD) measurements.

My dad used to service forced-air oil systems.

Jeff Bartlett