AAON LZ Series, Installation Operation & Maintenance

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7. Close the system-isolating valve.
8. Open suction isolating valve.
9. Switch on unit, initially both pumps will
run. As the pressure reaches the pump
control switch threshold, the pumps will
switch off.
10. Check all piping for leaks following
shipping.
11. Crack open system valve. The pressure
will fall and the pump will start and
maintain pressure.
Powered agitation (Ultra model only):
A solenoid valve is fitted to provide powered
agitation of the mixture. Automatically this
valve is periodically opened and the duty
pump starts creating circulation through the
pump and mixing tank. Automatic mixing is
inhibited when there is a system demand for
makeup.
A switch is provided for manual agitation
when adding glycol to the mixing tank.
Topping up with glycol:
The mixing tank is calibrated in liters and US
gallons. The normal top up level is 53 US
gallons (200 liters).
1.
Calculate the amount of water needed and
add or drain to the correct level.
2. Add the required amount of glycol.
3. Operate the manual-agitating switch.
4. Check the mixture percentage.
The unit is now ready for service.
Flo-Trex Combination Valve
Introduction
The Flo-Trex combination valves are
designed for installation on the discharge side
of centrifugal pumps, and incorporate three
functions in one valve:
1.
Drip-tight shut-off valve
2. Spring closure design, Non-slam check
valve
3. Flow throttling valve
Armgrip Flange Adapter Installation
1. Position the two halves of the Armgrip
flange adapter on the valve body ensuring
that the lugs on each half of the flange
adapters are located between the anti-
rotation lugs on the valve body (as
shown).
Insert two bolts of specified size (Table A1)
to secure the halves of the flange adapter to
the valve body (as shown).