Brochure

Bulletin-MC-INST-MMA-0615
Warranty & Engineering Data
MACON CONTROLS
NON-ELECTRIC
THERMOSTATICALLY
CONTROLLED RADIATOR
VALVES
APPLICATION
The Valve Body is used with the Thermostatic
Head to provide automatic control of baseboard
units, convectors, or standing radiators in hot
water systems and in 2-pipe steam heat systems.
For 1-pipe steam systems, a 1-pipe steam radiator
adapter assembly is available. A temperature
sensitive element in the head modulates the valve
in response to room temperature. Neither the
valve nor the thermostatic head requires the use
of electric power.
INSTALLATION
CAUTION
1. Installer must be a trained, experienced
serviceperson.
2. When installing the valve body, the arrow
must be in the direction of flow.
3. Always conduct a thorough checkout when
installation is complete.
IMPORTANT
1. On Straight-through body models, do not
install with thermostatic head directly above
valve body. On angle body models, assemble
with thermostatic head on the far side of the
valve from the heating surfaces to minimize
the effects of radiant heat.
2. If boiler for 1-pipe steam system is cycled by
a space thermostat in one zone, do not apply
a radiator valve to the radiator in that zone.
3. Do not apply a radiator valve in 1-pipe steam
systems that do not use steam air vent valves
venting to atmosphere on each radiation unit.
LOCATION
The valve may be used to control radiators,
baseboard units or convectors in single or multi-
zone hot water systems. The valve is used in 1-
pipe (monoflo) or 2-pipe heating systems. When
the valve is used to control a single radiator,
baseboard unit or convector, the valve is installed
on the inlet side (Fig. 1A). When a valve is used
to control a series of radiators or baseboards, the
valve should be installed on the return side of the
series run (Fig. 1B). In a multi-zone heating
system with a single radiator, baseboard unit, or
convector in each zone, a valve is installed on the
inlet side of each radiator in each zone (Fig. 1C
and 1D). In a multi-zone heating system with a
series of radiators or baseboards in a single zone,
install the valve on the return side of the series
run (Fig. 1D). In a 1-pipe steam system, a
vacuum breaker must be installed between the
steam vent and the radiator (Fig. 9).
IMPORTANT
The location of the valve depends on the location
of the thermostatic head. Be sure the thermo-
static head is NOT located where it is subject to
drafts, exposed to direct sunlight, or covered by
draperies or curtains. Note: When installing the
Thermostatic Head for remote mounting, the
hole in the mounting surface must be plugged
with suitable insulation to insure that it receives
minimal radiated heat and properly senses room
temperature.
VALVE BODY INSTALLATION
The valve body must be installed within the
following specified limits:
Max. Static Pressure: 145 psig
Max. Differential Pressure: 20 psig
Sug. Differential Pressure: .5 to 2.9 psi
Max. Steam Pressure: 15 psig
Max. Water Temperature: 250°F
When installing the valve body in water and 2-
pipe steam systems, the arrow must point in the
direction of flow. For valve bodies with NPT
threads, use new, properly reamed pipe, free of
chips. Valve distortion or malfunction may result
from excess pipe within the valve body.
For valves with sweat fittings:
IMPORTANT
Insert assembly MUST be removed from valve
bodies with sweat fittings before installation to
avoid heat damage to rubber components
(Fig. 2).
1. Use steel wool to thoroughly clean areas
inside of valve into which copper tubing fits
and approximately ¾ inch(19mm) at ends of
tubing.
2. Apply small amount of solder flux around
outside ends of tubing.
3. Insert both pieces of tubing completely into
valve body.
4. Use a propane torch to heat valve body at the
general area in which tubing is fitted.
Note: The hole in cover must be at least as
large as the knurled setting knob on the
thermostatic head to allow for baseboard
cover removal.
5. When valve body and tubing reach melting
temperature of solder, apply solder to joint.
Solder should draw evenly around fitting.
6. Do not disturb until solder sets up.
7. After cooling reinstall insert and visibly
inspect for leaks with water supply turned
on.
8. If leak is found, drain water and repeat
soldering procedure. Remember, only a
clean, fluxed joint which is free from water
will accept solder.
Note: Protective cap on body may be used to
manually operate valve before head is installed.
THERMOSTATIC HEAD
INSTALLATION
Models MTW
Direct Mounting on Radiator
Use the following procedure (Fig. 3):
1. Install the valve body on the radiator.
2. Remove the protective dust cover from the
valve body. Do not discard it.
3. Open thermostat to highest number.
4. Install the thermostatic head to the valve
body, do not over tighten thermostat nut,
finger tighten, snug 1/4 turn with wrench.
Fig. 3 Typical Installation of Valve (Angle
Body) on Radiator
Direct Mounting on Radiator
Use the following procedure (Fig. 4):
1. Install the valve body on the baseboard unit.
2. Cut a hole in the baseboard unit directly in
front of the valve connection.
Note: The hole must be at least as large as
the knurled setting knob on the thermostatic
head to allow for base board cover removal.
3. Remove the protective dust cover from the
valve body.
4. Open thermostat to highest number.
5. Install the thermostatic head to the valve
body, do not over tighten thermostat nut,
finger tighten, snug 1/4 turn with wrench.
6. Replace the baseboard cover.
7. Install pipe collar (collar not supplied)
around the insulating sleeve.
Fig. 4 Typical Installation of Direct Mount
Thermostatic Head in Baseboard
Models B46000 (ENTL) Fig. 5
Remote Wall Mounting
The Thermostatic Sensor is remote mounted
from the valve on a plasterboard wall.
IMPORTANT
When selecting a location to mount the thermo-
static head, remember it must not be subject to
drafts, exposed to direct sunlight, or covered by
draperies or curtains. To mount the thermostat on
a wall, use the following procedure (Figs. 5 & 8):
1. Select a location to mount the thermostatic
head. In making the selection, locate the wall
studs. Unnecessary and troublesome work
can be avoided by mounting the thermostatic
head and running the capillary between 2
wall studs.
2. After selecting a location, prepare two
openings 1½ inches in diameter. Prepare one
opening near the actuator behind the base-
board unit or convector and one at the
thermostatic head location.
Note: Capillary is 6’6” long.
3. Open thermostat to highest number.
4. Install the thermostatic head to the valve
body, do not over tighten thermostat nut,
finger tighten, snug 1/4 turn with wrench.
5. Replace the baseboard unit or convector
cover.
Important: Do not mount thermostat directly
over cover.
Fig. 5 Typical Wall Mounting of ENTL
Installation for Convectors
*Important: Do not mount sensor directly over
baseboard unit.
Fig. 6 Typical Wall Mounting of MTWZ
Installation for Baseboard
Models MTWZ (Fig. 7)
Remote Sensor Mounting
Use the following procedure (Fig. 6 & 7):
1. Install the valve body on the radiator.
2. Remove the protective dust cover from the
valve body.
3. Open thermostat to highest number.
4. Install the thermostatic head to the valve
body, do not over tighten thermostat nut,
finger tighten, snug 1/4 turn with wrench.
5. Select a sensor location.
Note: When selecting a location, remember
that the sensor must not be exposed to drafts
or direct sunlight, or covered by curtains or
draperies.
7. Mount the sensor guard to the wall with 2
screws (not supplied).
8. Snap the sensor bulb into place on the sensor
guard base.
9. Snap the sensor guard cover into place on
the sensor guard base.
Models B56000-ENTLZ (Fig. 8)
Remote Wall Mounting
Use the following procedure (Fig. 8):
1. Select a location on the wall to mount the
dial. In making the selection, locate the wall
studs and mount the dial so the capillary can
be flush mounted.
2. After selecting a location, drill 2 holes 1½
inches in diameter, one at the dial location,
the other behind the baseboard or convector
unit. Note: Each capillary is 6’6” long.
*Important: Do not locate sensor behind
curtains, drapes or in direct sunlight.
Fig. 7 Typical Free Standing Radiator
Installation
3. Feed the actuator through the hole at the dial
location behind the wall and out through the
second hole.
4. Install the valve body.
5. Remove the protective cover from the valve
body.
6. Open thermostat to highest number.
7. Install the thermostatic head to the valve
body, do not over tighten thermostat nut,
finger tighten, snug 1/4 turn with wrench.
8. Secure the dial to the unit cover with 4
screws (not supplied). Snap cover into place.
9. Mount the sensor below the radiation in the
return air. Note: Secure the sensor guard
base to the wall with 2 screws (not sup-
plied). Snap the sensor bulb into place. The
sensor guard cover may be used if desired.
Remote Mounting on Unit Cover
Use the following procedure (Fig. 8):
1. Install the valve body.
2. Select a location for the dial and drill a 1½
inch diameter hole at the location.
3. Feed the actuator through the hole to the
valve body.
4. Remove the protective cover from the valve
body.
5. Install the actuator on the valve body.
*Important: Do not locate sensor behind
Tunstall Corporation
118 Exchange St
Chicopee, MA 01013
Ph. 413-594-8695 • Fax [phone]
www.maconcontrols.com
Contact your local distributor for parts
Fig. 1 Valve Location in Single and
Multi-zone Hot Water Heating.
curtains, drapes or in direct sunlight.
Fig. 8 Typical Wall Mounting of ENTLZ
Installation for Convectors
CHECKOUT
When the installation is complete, rotate the dial
until steam or water flow is detected. After the
room temperature has stabilized (4 or 5 hours),
reset the dial to the desired setting between 1 and
7 for MTW Series. (See chart on back page for
temperature settings.) The set point will vary
with the location of the sensor. A floor level
sensor on a baseboard radiator will control at a
different set point than a wall level sensor.
Note: Repositioning of the actuator head may be
necessary for convenient visibility of the index
mark. Loosen the union between the actuator
head and the valve body. Turn the actuator head
to the desired position and retighten the actuator
nut.
SERVICE (All Models)
Recalibration
The thermostatic head is factory calibrated and
should not need calibration. If, however, you feel
that recalibration is required please contact
factory.
CAUTION
Be careful not to damage “O” rings.
Insert Replacement
1. Relieve system pressure and drain below
level of valve.
2. Remove thermostatic head.
3. Unscrew insert.
4. Screw new insert into body.
5. Replace thermostatic head and refill system.
ONE-PIPE STEAM SYSTEMS (Fig. 9)
Be sure boiler is cycled.
Keep pressure as low as possible (1-1/2 psi
recommended).
1. Use direct or remote Thermostat with one-
pipe steam valve.
2. Install as shown in Fig. 9. Note: Steam air
vent must be mounted in upright position.
Vacuum breaker required.
3. If the boiler is being cycled by a space
thermostat, do not install a valve in this
Fig. 2 NT Series Insert