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SECTION 1 - INSTALLATION
FIGURE 19 - POSITION BLACK COVER
3. If the black cover is loose, position it in place and
slide it back onto the actuator (see Figure 19 on
page 28).
4. Secure the red cover back over the actuator as-
sembly.
5. Ensure the plastic tabs are secured to the metal
body bracket.
6. Connect the quick-connect terminals, and insert
the damper assembly into the discharge collector
box.
7. Fasten the assembly using the seven fasteners.
28
SYSTEM FLUSHING AND CLEANING
After the piping system is complete, and before con-
necting the refrigeration chassis, flush and clean the
risers This ensures a proper start-up and continued ef-
ficient operation of the system (see Figure 20 on page
29).
Flushing the System
1. Ensure the supply and return riser shut-off valves
are closed at each unit.
2. Using flexible hoses or piping, connect the supply
and return stub-outs in the unit located at the end
of the riser run(s).
If the building has more than ten floors, connect
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the supply and return stub-outs in the last two
units to divide the water flow and reduce pressure
drop at the pump (see Figure 20 on page 29).
3. Open the shut-off valves in the units that have had
the supply and return risers interconnected.
4. Fill the water circulation system with clean wa-
ter from the make-up water supply. Ensure the air
vents are open during initial filling. Do not allow
the system to overflow.
5. Close the air vents, and start the circulating pump.
6. Ensure that all air is bled from the system by
cracking each air vent.
Make-up water must be available in suf-
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ficient volume to replace the volume oc-
cupied by the air that is bled off.
7. When all the air is vented and the water is circu-
lating under pressure, check the entire system for
leaks. Repair any leaks as required.
8. Raise the temperature to approximately 85.0°F
by setting the loop temperature controls. Visually
check for any leaks that may have occurred due to
the increased heat. Repair any leaks as required.
9. Open the drain at the lowest point in the system.
The make-up water flow rate must be
equal to the rate of the drain bleed.
FORM 145.18-IOM1
ISSUE DATE: 8/30/2018
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