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� WARNING! �
WARNING! To prevent injury or death due to electrical shock
or contact with moving parts, open unit disconnect before
servicing unit.
System Cleaning and Flushing - Cleaning and flushing
the unit is the single most important step to ensure proper
start-up and continued efficient operation of the system.
Follow the instructions below to properly clean and flush
the system:
1. Verify that electrical power to the units is
disconnected.
2. Install the system with the supply hose connected
directly to the return riser valve. Use a single length of
flexible hose.
3. Open all air vents. Fill the system with water. Do
not allow system to overflow. Bleed all air from
the system. Check the system for leaks and repair
appropriately.
4. Verify that all strainers are in place. Start the pumps
and systematically check each vent to ensure that all
air is bled from the system.
5. Verify that makeup water is available. Adjust makeup
water appropriately to replace the air which was bled
from the system. Check and adjust the water/air level
in the expansion tank.
6. Set the boiler (when used) to raise the loop
temperature to approximately 85° F. Open a drain at
the lowest point in the system. Adjust the makeup
water replacement rate to equal the rate of bleed.
7. Refill the system and add trisodium phosphate in
a proportion of approximately one pound per 150
gallons of water. Reset the boiler (when used) to raise
the loop temperature to about 100°F.
8. Circulate the solution for a minimum of eight to
24 hours. At the end of this period, shut off the
circulating pump and drain the solution. Repeat
system cleaning if necessary.
9. When the cleaning process is complete, remove the
short-circuited hoses. Reconnect the hoses to the
proper supply and return the connections to each of the
Rooftop Units. Refill the system and bleed off all air.
� CAUTION! �
CAUTION! To avoid possible damage to piping systems
constructed of plastic piping, DO NOT allow loop temperature
to exceed 115° F.
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
Start-Up Procedure
10. Add antifreeze to the system in climates where
ambient temperature falls below freezing, using the
proportion of antifreeze shown in Table 5. The volume
of antifreeze required will vary based on outdoor
design temperature.
11. Test the system pH with litmus paper. The system
water should be slightly alkaline ( pH 7.5 to 8.5).Add
chemicals as appropriate to maintain acidity levels.
12. When the system is successfully cleaned, flushed,
refilled and bled, check the main system panels,
safety cutouts, and alarms. Set the controls to
properly maintain loop temperatures.
� CAUTION! �
CAUTION! Do Not use "Stop-Leak" or any similar chemical
agent in this system. Addition of these chemicals to the loop
water will foul the system and will inhibit unit operation.
Table 5: Percent Antifreeze Required By Volume
Minimum Ambient Temperature
Antifreeze
0°F
Methanol
25%
Propylene Glycol
26%
Ethylene Glycol
24%
Note: The manufacturer strongly recommends all piping
connections, both internal and external to the unit, be
pressure tested by an appropriate method prior to any
finishing of the interior space or before access to all
connections is limited. Test pressure may not exceed
the maximum allowable pressure for the unit and all
components within the water system. The manufacturer
will not be responsible or liable for damages from water
leaks due to inadequate or lack of a pressurized leak
test, or damages caused by exceeding the maximum
pressure rating during installation.
� CAUTION! �
INSTALLER CAUTION! After making water connections on
units equipped with Condenser Hot Water Reheat, ensure
the three union nuts on the internal three-way valve are tight.
JRE - Series
R e v . : A u g u s t 1 9 , 2 0 2 0
10°F
20°F
30°F
21%
16%
10%
23%
19%
9%
20%
16%
12%
35
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