Desert Aire SelectAire Plus SP Series, Инструкция по установке и эксплуатации, Страница: 22 / 110

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Desert Aire - SP Manual
Figure 9 - SP Roof Curb Unit Showing Condensate Drain Location
Connect the trap to a main drain line with 1/4” of downward pitch per linear foot of run. Support the drain
pipe every five feet to prevent sagging.
The SelectAire Plus™ units are equipped with internal condensate traps to allow for proper unit function.
These are conservatively sized to handle the negative static pressure that was specified at the time of
order. Do not install a second trap external to the equipment as this may cause a pocket
of air to be formed and result in backup of water into the pan and will result in equipment or
building damage.
Internal condensate traps require priming before unit operation. Pour enough water into each evaporator
drain pan until water comes out of the condensate drain line.
There is a drain pan located under the internal reheat condenser coil that is for purposes of draining the
water away during cleaning of the reheat coils. For convenience this is piped to the same drain as the
condensate. If you wish to use the drain pan during cleaning, ensure that the cleaning solutions and
the contamination to be washed from the coils will not cause any issues for the existing drain system. If
the condensate is being recycled in any manner or the system leads to a sanitary sewer system, draining
the products of the cleaning process may not be appropriate. If the drain is to be used, open the valve
that allows water from the lower coil pan to enter the condensate system and proceed with the cleaning
process. Note that once complete, the valve must be returned to a closed position to provide for proper
operation of the condensate traps when the unit is turned on.
See Section 2.10 for condensate line instructions for auxiliary gas heating if equipped.