Specifications

3. Supplemental heater and circulator pump should be shut off. All drains and vents should be opened to
completely drain down the system. Short circuited supply and return runouts should now be connected
to the conditioner supply and return connections. Teflon tape is recommended over pipe dope for pipe
dope for pipe thread connections. Do not use sealers at the swivel flare connections of hoses.
4. Trisodium phosphate was formerly recommended as a cleaning agent during flushing. However, many
states and localities ban the introduction of phosphates into their sewage systems. The current
recommendation is to simply flush linger with warm 80°F (27℃) water.
5. Refill the system with clean water. Test the litmus paper for acidity, and treat as required to leave the
water slightly alkaline (pH 7.5 to 8.5). The specified percentage of antifreeze may also be added at this
time. Use commercial grade antifreeze designed for HVAC systems only. Do not use automotive
grade antifreeze.
6. Set the system control and alarm panel heat add setpoint to 70°F (21℃) and the heat rejection setpoint
to 85°F (29℃). Supply power to all motors and start the circulating pumps. After full flow has been
established through all components including the heat rejecter (regardless of season) and air vented
and loop temperatures stabilized, each of the conditioners will be ready for check test and start-up and
for air and water balancing.
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