Install Instructions

the body “O” ring and the “soft seat” remain in position
(inspect the body “O” ring and the “soft seat” for any
nicks or cuts and replace as necessary).
4. Reinstall the body bolts and torque to 50 ft lbs.
REPLACING STEM PACKING
If a leak develops at the stem packing nut, turn nut clock-
wise until the leak stops.
If the leak persists you will need to replace the stem pack-
ing, this may be accomplished while valve is under full sys-
tem pressure.
1. Record valve setting utilizing memory clip.
2. Remove retaining rings and calibration name plate.
3. Turn valve stem counter-clockwise until the valve is fully
open and will not turn any further.
4. Remove packing nut, located at base of stem by turning
counter clockwise.
5. Remove old packing and replace it with two new packing
rings with the ring joints positioned 180 degrees apart.
6. Replace packing nut and tighten as required.
7. Reinstall calibration name plate and retaining rings.
8. Reposition valve stem per recorded setting in step one.
FLOW METER OPERATION
1. Remove caps from the valves at the HI and LO pressure
taps.
2. Connect the high pressure hose (red) of the differential
pressure gauge to the upstream of HI pressure connec-
tion on the MPV and the low pressure hose (green) to the
downstream of LO pressure connection.
Note: Hose ends to be connected require valve depres-
sors. Check opposite end of hose if not visible inside
hose end. Valves are opened automatically as the hose
end is screwed on.
3. Prepare the differential pressure gauge as per instruc-
tions in the Gauge Kit.
4. The flow can be determined by reading the differential
pressure indicated at the gauge, noting the valve open-
ing from the scale and pointer and transferring this data
to the Flow Chart (published separately).
5. When flow readings are complete, follow directions sup-
plied with differential pressure gauge.
6. Replace metal caps on valves at the HI and LO pressure
taps.
NOTE: In order to achieve optimal accuracy when using
any differential pressure flow measuring device, it is recom-
mended that a minimum of 10 diameters of straight pipe
(sized to the device) be installed upstream of the device and
a minimum of 5 diameters of straight pipe be installed
downstream of the device.
Do it Once. Do it Right.
™
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: [phone] FAX: [phone].
TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: [phone]. FAX: [phone].
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
WARNING: Hot water leakage can occur
from readout valves during hookup of readout
kit. Follow the instructions in instruction manuals
supplied with readout kits for safe use. Keep eyes pro-
tected with safety glasses. Make sure that readout
valves are not leaking before removing safety cap.
Failure to follow this instruction can result in serious per-
sonal injury or death and property damage.
Taco, Inc. will repair or replace without charge
(at the company’s option) any product or part
which is proven defective under normal use
within one (1) year from the date of start-up or
one (1) year and six (6) months from date of
shipment (whichever occurs first).
In order to obtain service under this warranty, it
is the responsibility of the purchaser to prompt-
ly notify the local Taco stocking distributor or
Taco in writing and promptly deliver the subject
product or part, delivery prepaid, to the stocking
distributor. For assistance on warranty returns,
the purchaser may either contact the local Taco
stocking distributor or Taco. If the subject prod-
uct or part contains no defect as covered in this
warranty, the purchaser will be billed for parts
and labor charges in effect at time of factory
examination and repair.
Any Taco product or part not installed or operat-
ed in conformity with Taco instructions or which
has been subject to misuse, misapplication, the
addition of petroleum-based fluids or certain
chemical additives to the systems, or other
abuse, will not be covered by this warranty.
If in doubt as to whether a particular substance
is suitable for use with a Taco product or part, or
for any application restrictions, consult the
applicable Taco instruction sheets or contact
Taco at [401-942-8000].
Taco reserves the right to provide replacement
products and parts which are substantially similar
in design and functionally equivalent to the defec-
tive product or part. Taco reserves the right to
make changes in details of design, construction,
or arrangement of materials of its products with-
out notification.
TACO OFFERS THIS WARRANTY IN LIEU OF
ALL OTHER EXPRESS WARRANTIES. ANY
WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR
FITNESS IS IN EFFECT ONLY FOR THE DURA-
TION OF THE EXPRESS WARRANTY SET
FORTH IN THE FIRST PARAGRAPH ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TACO.
TACO WILL NOT BE LIABLE FOR ANY SPE-
CIAL, INCIDENTAL, INDIRECT OR CONSE-
QUENTIAL DAMAGES RESULTING FROM THE
USE OF ITS PRODUCTS OR ANY INCIDENTAL
COSTS OF REMOVING OR REPLACING
DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific
rights, and the purchaser may have other rights
which vary from state to state. Some states do
not allow limitations on how long an implied war-
ranty lasts or on the exclusion of incidental or
consequential damages, so these limitations or
exclusions may not apply to you.
LIMITED WARRANTY STATEMENT
WARNING: Hot system fluid leaking from
valves can cause burns. Avoid contact with
leaking system fluid when servicing any valve.
Failure to follow this instruction can result in serious
personal injury or death and property damage.
CAUTION: Safety glasses should be worn.