White Rodgers 37-6334a User Manual
Operator: Save these instructions for future use!
CAUTION
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
The compact zone valves are 2-way straight through, available
as a normally open or normally closed valve. The zone valves
come with or without a SPST normally open auxiliary switch and
feature a swing-type ball valve, which is designed to rotate which
causes the ball plug to seat on a different section of its surface
on each closing. They are available in several piping options,
sweat, NPT, inverted flare and flare fitting end connections for
standard copper tubing, for use with 2-wire thermostats. These
zone valves provide a low cost system of zoned temperature
control wherever hot water is the heating medium. In new
construction, the piping system can be laid out to produce any
number of independent temperature controlled zones by use of
these valves. In existing buildings, a variety of zone combinations can be obtained, depending on the particular piping layout.
Each zone requires one zone valve and one thermostat, but only
one circulator is normally required for the entire system.
This compact zone valve is intended for use with a low voltage
system; do not use this zone valve with a millivolt or line voltage
system. If in doubt about whether your wiring is millivolt, line or
low voltage, have it inspected by a qualified heating contractor
or electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
COMPACT ZONE VALVES
2-WIRE, 2-WAY
For use on systems up to 142 PSI
INST ALLA TION INSTRUCTIONS
DESCRIPTION
Flare Fittings
Available Separately
PRECAUTIONS
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box, until installation is complete.
CAUTION
To prevent injuries from scalding always drain system
before installing or removing valve. To avoid gear damage
operate lever slowly.
All guarantees are void if these specifications are exceeded.
Maximum System Pressure: 142 PSI
Differential Across Valve: 20 PSI
Maximum Water Temperature: 230°F
Minimum Water Temperature: 41°F
Maximum Ambiant Temperature: 140°F
Approx. Time Cycle: 10 seconds from full close to full open;
4 seconds from full open to full close.
Electrical Rating:
Valve motor – 0.35A @ 25VAC, 50/60 Hz., 6 W nominal
Auxiliary switch: 3.0A Max. @ 25VAC
Thermostat: Use two-wire heating thermostat, .35A heat
anticipation is required.
Flow Coefficient - Cv Rating:
1/2" valves – 3.5 Cv (3.0 Kv)
3/4" valves – 3.5 Cv (3.0 Kv)
1" valves – 3.5 Cv (3.0 Kv)
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 Reavis Road
St. Louis, MO 63123-5398
www.white-rodgers.com
WARNING
Do not use on circuits exceeding specified voltages.
Higher voltages will damage control and could cause
shock or fire hazard.
SPECIFICATIONS
MOUNTING POSITIONS:
Upright or 0° to 90° from upright
UPRIGHT
Fig. 1 Zone valve mounting positions
LEFT OR RIGHT
INLET
UP OR DOWN
360°
MAN
AUTO
PART NO. 37-6334A
0142
OPERATION
The schematic drawing Fig. 2 is for a normally closed valve.
As shown, the valve is closed and the thermostat is satisfied.
When the thermostat closes its contacts, the valve begins to
open as a circuit is made from the transformer to the motor and
thermostat, back to the transformer.
Shortly after the valve begins to open, the auxiliary switch
closes (providing a low voltage auxiliary circuit for starting
burner and/or circulator). After an elapsed time of about 10
seconds, the valve reaches the full open position. The valve
motor now remains energized to keep the valve in the open
position.
When the thermostat is satisfied, the circuit through the valve
motor is broken and a return spring begins to close the valve.
Just before the valve reaches the closed position, the auxiliary
switch opens to stop burner and/or circulator.
TYPE 'Z' ZONE VALVE
N.O. CONTACT
AUX. SWITCH
MOTOR
INTERNAL WIRING
EXTERNAL WIRING
A B
BLACK
BLACK
BROWN
BLUE
GREEN
2-WIRE HEATING
THERMOSTAT
Fig. 2
A
HOT
LINE
N
TRANSFORMER
B
VALVE CLOSED
VALVE OPEN
Fig. 3 Operation for normally close (N.C.) valve
PIPING
The two most commonly used piping systems are
shown below. Plan 1 is popular for new installations,
while plan 2 is frequently used when converting twopipe systems.
PLAN 2
A common main supplies all
zones, with a water valve installed
on the riser to each zone.
Fig. 4
PLAN 1
Water valves installed at the boiler
header to provide a separate
supply to each zone.
INSTALLATION
ALL GUARANTEES ARE VOID IF THE VALVE IS NOT ASSEMBLED ACCORDING TO THESE INSTRUCTIONS.
1. Disconnect electric power before connecting wiring to prevent
electrical shock or equipment damage.
2. Select suitable valve location. Valve may be installed in any
position, except upside down. The arrow on the side of the
body indicates direction of flow throught the valve. (“A” is
inlet, “B” is outlet)
3. Mount valve directly in the tube or pipe, as follows:
NOTE
For normally closed (N.C.) models, with sweat fittings,
set the manual lever to the "MAN" position before
applying heat to the fittings. This will protect the plug
ball inside the valve by removing it from the seat. After
installation, place manual lever in the "AUTO" position.
Flare fitting models
Use new, properly reamed pipe, free from chips. The valve
body is threaded for standard 5/8 in. OD copper, 45° SAE
flare-fitting nuts. These nuts are not furnished with the valve
and must be obtained separately.
Sweat copper models
Use new, properly reamed pipe, free from dents or corrosion.
Sweat the joints, keeping the outer surface free from solder.
DO NOT use silver solder because of the high melting
temperatures required.
NPT pipe models
Use new pipe that is properly chamfered, reamed and free of
burrs and chips. If using old pipe, be sure it is clean and free
of rust, scale, burrs, chips and old pipe joint compound.
Apply pipe joint compound or teflon tape, only to the male
threads of the pipe joint. DO NOT apply compound or teflon
tape to the first two threads. If using a vise or open-end
wrench to hold the valve while installing piping, do not tighten
excessively, as this may damage the valve.
4. Support piping with a pipe hanger on each side of valve.
Fig. 5
729
WIRING
All wiring should be done according to local and national electrical codes
Follow any specific wiring instructions provided by the boiler
manufacturer. If none are supplied, the following diagrams offer
typical wiring installations using 2-wire heating thermostats
(.35A Heat-Anticipation) and other related controls.
A 40VA Transformer will handle up to 4 zone valves. A 20VA will
handle up to 2 zone valves.
2
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