Magic Aire HCA Series, Инструкция по установке, эксплуатации и обслуживанию

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035-000049-001 Page 13 HCA IOM 1.1 8-28-2017
Fig. 7 — Condensate
Drain
INSTALLATION
Condensate Drain — Install a trapped condensate
drain line at unit drain connection. HCA units have a 3/4
in. FPT condensate drain connection, or alternately a
3/4” male PVC pipe outlet for the condensate drain con-
nection.
WARNING! To prevent excessive build-up of conden-
sate in drain pan, adequate trap clearance (trap depth)
must be provided beneath the unit as indicated in Fig. 6.
Measure maximum design negative static pressure up-
stream from the fan. Referring to Fig. 7, height “H” must
be 1” larger than the fan inlet static pressure Iinches
w.g.) at the design operating conditions. Prime enough
water in trap to prevent losing seal when starting up the
unit. After the fan is running with the design fan inlet
(negative) pressure, the elevation of the water on the
unit side of the trap will be 1” below the drain invert.
Provide freeze-up protection as required to insure relia-
ble condensate drainage. Freeze protection measures
are customer-supplied and installed.
Water Coil Piping Recommendations
Water coils are piped by connecting the supply
at the bottom and the return at the top. This is
“counterflow” piping arrangement and is nec-
essary to achieve rated thermal performance.
CAUTION! Piping the other way
(parallel) will result in reduced thermal
performance!
Coil Venting: Water coils are not provided with
venting devices. Insure that the circulating
water system has proper air venting capability.
If vents are required at the coil, install them in
the field piping attached to the return (upper)
connection.