Install Instructions

93
IM-PR 566442 1114 (Design Manual)
Purging
Once tubing is filled with water, it must be
protected from freezing. This can be done by
waiting to purge and fill the tubing until the building
is ready to be conditioned, or by using a glycol
mixture within the tubing. Glycol mixtures may also
be needed in systems that are not used year-round
that may be exposed to freezing temperatures. Use
of a glycol solution will impact the heat transfer
capability of the fluid, so ensure that the design has
accounted for this. See Section 5.13.1, Pressure
testing, filling and purging, for more information on
filling and purging a glycol solution.
The purging procedure varies based on availability
of water. Assuming that water for filling and purging
is provided by the primary piping makeup water
system:
1. Remove the high-limit from any mixing valve.
The high-limit can be reinstalled and reset
after the purge is complete. For instructions
on setting the high-limit, see Section 4.2.3.
2. With manifold connected, close all manifold
circuit valves.
3. Close isolation ball valve on the return
header.
4. Attach a drain hose to the return header drain
valve.
5. Open circuit shutoff valves on supply and
return headers for first circuit to purge and fill
this circuit.
6. Once purge and fill for first circuit is
complete, close circuit shutoff valves on
supply and return headers.
7. Repeat steps 4 and 5 for each additional
circuit, one at a time.
8. Once last circuit is purged and filled, close
last circuit shutoff valve.
9. Open all circuit shutoff valves on supply and
return headers.
10. Close drain valve.
Where water for filling and purging is not provided
from primary piping:
1. Remove the high-limit from any mixing valve.
The high-limit can be reinstalled and reset
after the purge is complete. For instructions
on setting the high-limit, see Section 4.2.3.
2. Close isolation ball valves on supply and
return headers.
3. Connect fill hose/purge water source to drain
valve on supply header.
4. Attach a drain hose to the return header drain
valve.
5. Open drain valve on supply header to start
water flow into supply header.
6. Steps 5 through 10 are the same as if water
fill is from primary system.
NOTE: If the system must be purged again in
the future for any reason, the high-limit must be
reopened during purging for full flow.
4.2.2 Initial balancing
Many times it is not possible to design the system
using equal circuit lengths, so the system must
be balanced in order to ensure adequate flow to
each circuit on a manifold. The exception to this
is the Climate Mat, which is designed with circuits
of equal lengths. For all other applications, refer to
your design for detailed balancing flow rates.
Procedure:
1. Start with all valves wide open.
2. To decrease flow, turn the balancing valve
clockwise in small increments.
3. Balancing is complete when design flow rates
are achieved.
Figure 4-7 Locating balancing valves
Balancing
Valves