Enviro VB09-36, Установка, эксплуатация и обслуживание

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FORM ET145.18-IOM1 (115)
ENVIRO-TEC 12
12. Ensure that individual unit shut-off valves remain closed
until the circulating loop system has been cleaned and
flushed.
B. SUPPLY AND RETURN PIPING
1. Install a drain valve, shut-off / balancing valves, flow
indicators, and drain tees at the base of each supply and
return riser to enable system flushing, balancing, and
servicing.
2. Install strainers at the inlet of each circulating pump.
3. Insulate loop water piping that runs through
unconditioned areas of the building, or outside the
building. When loop water temperature is maintained
between nominal operating limits of 60-90
o
F, piping will
not sweat or suffer undue heat loss at conditioned space
temperatures.
4. Install vents in piping loop as required to bleed residual
air from the piping system during filling and servicing.
5. Refer to the following diagrams for determining what riser
shut-off valves and hose kits are required for job specific
site conditions.
A. Factory supplied risers will come with the
appropriate hose kits with NPSH type fittings (see
Diagram A). Before attaching hoses check that the
female end gasket is not missing and free of
damage or debris. See Table 3 below for
information on replacement gaskets.
B. For field supplied risers we recommend ordering the
appropriate NPSH type field hose kits from the
factory, complete with shut-off valves. Shut-off
valves are to be field sweat connected to risers (see
Diagram B).
C. Legacy chassis with NPT type connections and
matching risers with NPT shut-off valve connections
require a special hose kit complete with NPT to
NPSH swivel adapter on the shut-off valve and
chassis connection (see Diagram C) to mate to
factory hoses.
C. HOSES
Ensure the correct hose set is matched with the compatible
unit size, see Table 2. When installing NPSH factory provided
hoses installer must follow these procedures when installing
hoses:
1. Inspect for missing or damaged hose gasket, see Table 3
for replacement gasket part numbers.
2. Tighten by hand screw connections to male NPSH fitting
on shut-off valve. Hold ferrule stationary when tightening.
3. Tighten by hand then using a back up wrench tighten a
further quarter (1/4) turn only. Do not over-tighten!
When installing hoses do not apply a twist or
torque load on the hose.
When tightening hoses hold ferrule stationary by
hand while tightening the screw connections. Avoid
tight bends or water flow and high pressure drops
may occur.
Hose gasket does not require extreme tightening to
obtain a seal. DO NOT OVERTIGHTEN or damage to
gasket or sealing surface will occur. Do not apply
thread sealant.
Table 2: Chassis Hoses
CHASSIS MODEL HOSE TYPE
09/12/15/18 1/2” NPSH FEMALE-FEMALE
24/30/36 3/4" NPSH FEMALE-FEMALE
Table 3: Replacement Hose Gaskets
REPLACEMENT GASKETS FOR NPSH HOSE KITS
Part No. Description
VSGK-UFHW-050 1/2" RUBBER GASKET
VSGK-UFHW-075 3/4" RUBBER GASKET
HOSES MUST BE HAND TIGHTENTED THEN
FURTHER TIGHTENED NO MORE THAN 1/4 TURN.
DO NOT APPLY EXCESSIVE FORCE!
ALWAYS USE A BACK-UP WRENCH WHEN
TIGHTENING HOSES TO VALVES! OTHERWISE
VALVE SOLDER JOINT MAY FAIL LEADING TO
PROPERTY DAMAGE OR SERIOUS INJURY!