Honeywell Automobile Parts vc7900 User Manual

VC7900 Series  
Modulating Control Valves  
PRODUCT DATA  
(2) With integral 1 meter (nominal 39") leadwire cable-  
VC7931. OR  
(3) With intergral 1 meter plenum-rated leadwire cable and 3/8”  
flexible conduit connector (low voltage only)- VC7934  
VC7934 meets UL94-5V requirements for installation in return  
air plenums.  
Operating ambient temperature: 0 to 65 °C (32 to 150 °F)  
(VC7934 is 60 °C [140 °F] max.)  
Shipping & storage temperature: -40 to +65 °C (-40 to  
+150 °F)  
Atmosphere:  
The VC7900 Series Modulating Control Valves provide  
optimum control of hot and/or chilled water flow in various  
heating and cooling applications.  
Non-condensing, non-corrosive, non-explosive.  
VC7934 meets UL94-5V requirements for installation in return  
air plenums.  
The VC hydronic valve consists of a valve body and  
replaceable characterized cartridge assembly. When used with  
a Honeywell VC7900 actuator, the valve provides proportional  
flow in either diverting or mixing applications. They are  
designed to provide sinusoidal valve actuator travel, and  
therefore operate silently and resist water hammer. The  
VC7900 series valve actuator is used with any 0-10 Vdc  
controller.  
Min. & max. fluid temperatures: Max. – 4 Bar (60 psi)  
Operating pressure differential: Max. – 4 Bar (60 psi)  
Pressure rating:  
Static – 20 Bar (300 psi)  
Burst – 100 Bar (1500 psi)  
Valve material: Body of bronze; cartridge of Ryton™  
(polyphenylene sulphide) & Noryl™ (polyphenylene oxide);  
O-ring seals of EPDM rubber; stainless steel stem.  
SPECIFICATIONS  
Flow Characteristics: Linear  
Supply Voltage:  
Colour coded label  
24V, 50-60Hz; Class 2 circuit  
Blue  
The specifications above are nominal and conform to generally  
acceptable industry standards. Honeywell is not responsible for  
damages resulting from misapplication or misuse of its  
products.  
Control Signal:  
Nominal 0/2 to 10 Vdc (actual 2 to 9 Vdc)  
Input impedance 47.5 k ohms  
Accessories and Replacement Parts:  
Power consumption: 4 Watts Max. at nominal Voltage (during  
valve position change). Use 24 V Class 2 transformer and  
provide 6 VA for transformer and connection wire sizing.  
40007029-002: Wrench for removing VC cartridge  
VCZZ1100: 2-way characterized cartridge, unit pack  
VCZZ6100: 3-way characterized cartridge, unit pack  
Maximum Duty Cycle: 15%  
Table 1. Series 70, 0/2-10 Vdc Actuator  
Nominal timing: Opens in 2 minutes @ 60 Hz  
Voltage  
Nominal  
Electrical  
Model Series  
VC7930  
(50/60 Hz)  
Stroke Timing  
Connection  
Actual Full Stroke Timing is 140 sec  
Note: Timing is approximately 20% longer @ 50 Hz  
24 Vac  
120 seconds at  
60 Hz  
6-pin Molex™  
1 meter cable  
VC7931  
Electrical termination (3 versions available):  
(1) Molex™ (header # 39-30-1060). Requires mating connector  
(receptacle/housing # 39-01-2060)- VC7930. OR  
VC7934  
24 Vac plenum-  
rated  
150 seconds at  
50 Hz  
1.5 m plenum-  
rated cable  
NOTE: Timing is approximately 20% longer @ 50 Hz.  
95C-10831-04  
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VC7900 SERIES MODULATING CONTROL VALVES  
Put the VC actuator manual lever in the manual open  
or the fully open (down) position to allow initial system  
flushing with the actuator mounted. This may be done  
without electrical hook-up. Alternatively, reusable  
flush caps, part # 272866B, may be purchased sepa-  
rately for use in initial flushing of dirty hydronic sys-  
tems.  
INSTALLATION  
When Installing This Product...  
1. Read these instructions carefully. Failure to follow them  
could damage the product or cause a hazardous condi-  
tion.  
2. Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
3. Installer must be a trained, experienced service-person.  
4. Always conduct a thorough checkout when installation is  
completed.  
5. While not necessary to remove the actuator from the  
body, it can be removed for ease of installation. The actu-  
ator can be installed in any position to suit the most con-  
venient wiring direction. Actuator latching mechanism  
works only when the lengths of the actuator and the  
valve body are parallel to each other.  
Do not use boiler additives, solder flux and wetted  
materials which are petroleum based or contain min-  
eral oil, hydrocarbons, or ethylene glycol acetate.  
Compounds which can be used, with minimum 50%  
water dilution, are diethylene glycol, ethylene glycol,  
and propylene glycol (antifreeze solutions).  
COMPRESSION MODELS  
For compression fitted models, tighten the compression nuts  
enough to make a watertight seal. TAKE CARE NOT TO OVER  
TIGHTEN. Maximum torque limit is 45 Nm (33 ft-lb) for the  
22 mm compression fitting, and 65 Nm (48 ft-lb) for the 28 mm  
compression fitting.  
6. An extra 25 mm head clearance is required to remove  
the actuator.  
CAUTION  
SWEAT MODELS  
1. Disconnect power supply before connecting wiring  
to prevent electrical shock and equipment damage.  
2. On 24V systems, never jumper the valve coil termi-  
nals, even temporarily. This may damage the thermo-  
stat.  
On sweat fitted valves, the cartridge is shipped loose to avoid  
being damaged during the solder operation.  
1. Remove valve actuator from body and solder the con-  
necting pipes in accordance with normal soldering prac-  
tices.  
PLUMBING  
2. After soldering and valve has cooled, remove cartridge  
assembly from plastic bag, insert into the valve body and  
tighten down with enclosed wrench (part# 40007029-  
002) until it bottoms out. DO NOT OVER TIGHTEN  
(maximum torque is 4.5Nm [40 in-lb]). The top surface of  
the cartridge will be flush with the top edge of the body  
casting.  
The valve may be plumbed in any angle but preferably not with  
the actuator below the horizontal level of valve body. Make sure  
there is enough room around the actuator for servicing or  
replacement.  
For use in diverting applications, the valve is installed with the  
flow water entering through bottom port AB, and diverting  
through end ports A or B. In mixing applications the valve is  
installed with inlet to A or B and outlet through AB.  
3. Replace valve actuator.  
TO INSTALL REPLACEMENT ACTUATOR  
Mount the valve directly in the tube or pipe. Do not grip actuator  
while making and tightening up plumbing connections. Either  
hold valve body in your hand or attach adjustable spanner  
(38 mm or 1-1/2") across the hexagonal or flat faces on the  
valve body. (Figure 5).  
IMPORTANT  
Installation of a new actuator does not require drain-  
ing the system provided the valve body and valve car-  
tridge assembly remain in the pipeline.  
1. Check replacement part number and voltage ratings for  
match with old device.  
2. Disconnect power supply before servicing to avoid elec-  
trical shock or equipment damage.  
3. Disconnect leadwires to actuator, or depress tab on  
Molex™ connector and remove. Where appropriate,  
label wires for rewiring.  
4. The actuator head is automatically latched to the valve.  
To remove, press up on the latch mechanism located  
directly below the white manual open lever with thumb  
(See Figure 6). Simultaneously press the actuator down  
towards the body with moderate hand force and turn the  
actuator counter-clockwise by 1/8 turn (45 degrees). Lift  
actuator off the valve body.  
M29716  
Fig. 5. Plumbing of the VC valve.  
IMPORTANT  
NOTE: The actuator can also be installed at right  
angles to the valve body but in this position the  
latch mechanism will not engage.  
For trouble-free operation of the product, good instal-  
lation practice must include initial system flushing,  
chemical water treatment, and the use of a 50 micron  
(preferably 5 micron) 10% side stream system filter(s).  
Remove all filter(s) before flushing. Limit flow through  
the filter to 5~10% of total system flow to prevent  
'starving' the system. Ensure filter cartridge is  
changed frequently enough to prevent clogging.  
5. Install the new actuator by reversing the process in (4).  
6. Reconnect leadwires or Molex™ connector.  
7. Restore power, and check out operation.  
3
95C-10831—04  
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VC7900 SERIES MODULATING CONTROL VALVES  
OPERATIONS  
2
WITH SERIES 70, 0/2 - 10 VDC CONTROLLER  
(refer to Fig. 7)  
In the VC7900, an electronic circuit compares the voltage of  
the feedback potentiometer to the signal voltage. If they are  
different, then the circuit closes the appropriate triac and  
drives the motor in the direction that will bring the circuit back  
into balance. In addition, the standard limit switches maintain  
the travel to the normal operating range.  
In a direct acting model, 2 V signal will be fully closed, and 9 V  
will be fully open. In a reverse acting model, 9 V is closed and  
2 V is open. However, because of the soft close off of the VC  
valve, initial (and final) movements of the actuator will not  
cause any significant changes in the valve stem position.  
Fig. 6. Latch Mechanism to detach Actuator  
MANUAL OPENER  
The manual opener can be manipulated only when in the up  
position. The motorized valve can be opened by firmly  
pushing the white manual lever down to midway and in. In this  
position both the “A” and “B” ports are open, and with auxiliary  
switch models the switch is closed. This "manual open"  
position may be used for filling, venting, or draining the  
system, or for opening the valve in case of power failure. The  
valve can be restored manually to the closed position by  
depressing the white manual lever lightly and then pulling the  
lever out. The valve and actuator will return to the automatic  
position when power is restored.  
On a loss of power, the actuator will remain in the last  
position, and will resume normal operation on power up. On  
loss of signal, a direct acting device will go to the closed  
default position. A reverse acting device will go to the open  
default position.  
NOTE: If the valve is powered open, it can not be manually  
closed unless actuator is removed.  
WIRING  
See figures 7A and 7B for single unit wiring details.  
Multiple valves may be connected in parallel to a single  
controller and transformer, up to the current rating of the  
controller and transformer.  
Fig. 8. Wiring Schematic of the VC7900 Series Actuator  
SERVICE  
This valve should be serviced by a trained, experienced  
service technician.  
1. If the valve is leaking, drain system OR isolate valve  
from the system. Do not remove body from plumbing.  
2. Check to see if the cartridge needs to be replaced.  
3. If the motor or other internal parts of the actuator is  
damaged, replace the entire actuator assembly.  
Fig. 7a.Connector Pin Configuration for Molex™ Models  
for 0-10 Vdc Controller (Series 70)  
NOTE: Honeywell hydronic valves are designed and tested  
for silent operation in properly designed and installed  
systems. However, water noises may occur as a  
result of excessive water velocity. Piping noises may  
occur in high temperature (over 212°F [100°C]) sys-  
tems with insufficient water pressure.  
Fig. 7b. Wiring Colour Code for Cable Models for 0-10 Vdc  
Controller (Series 70)  
CHECKOUT  
1. Raise the set point of the thermostat above room tem-  
perature to initiate a call for heat.  
2. Observe all control devices - 2 way valve should open.  
Port A in 3 way valve should open, and port B should  
close.  
3. Lower the set point of the zone thermostat below room  
temperature.  
4. Observe the control devices. 2 way valve should close.  
Port A in 3 way valve should close, and port B should  
open.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
® U.S. Registered Trademark  
© 2011 Honeywell International Inc.  
95C-10831—04 T.D. Rev. 02-11  
Printed in U.S.A.  
Golden Valley, MN 55422  
customer.honeywell.com  
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