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Step 5 — Install Flue Hood (48HJ Rooftop Sec-
tions Only) —
Refer to the 48HJ installation instructions for
information on installing the flue hood.
Step 6 — Install Gas Piping (48HJ Rooftop Sec-
tions Only) —
Refer to the 48HJ installation instructions for
information on installing the gas piping.
Step 7 — Install External Trap For Condensate
Drain —
The condensate from the rooftop unit along with
condensate from the upper coil of the energy recovery section
is internally piped to the condensate pan in the lower section of
the energy recovery section. For this reason, the bottom drain
on the rooftop unit CANNOT be used for a condensate drain.
The
3
/
4
-in. drain connection on the energy recovery section is
located near the bottom left of the exhaust air section. See
Fig. 5A and 5B. The energy recovery section must have a
field-fabricated, external, P-trap installed for condensate drain-
age. Trap must be at least 4-in. deep to protect against freeze-
up. If the drain line is installed downstream from the external
trap, pitch the line away from the unit at 1-in. per 10-ft of run.
Do not use a pipe smaller than the connection (
3
/
4
-in.).
Step 8 — Make Electrical Connections
FIELD POWER SUPPLY — All units except 208/230-v
units are factory wired for the voltage shown on the nameplate.
Unit cabinet must have an uninterrupted, unbroken electri-
cal ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control com-
partment, or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code), ANSI/NFPA, latest edition, and local electrical
codes. Do not use gas piping as an electrical ground. Fail-
ure to follow this warning could result in the installer being
liable for personal injury of others.
Fig. 6A — Rigging Label — COBRA™ Energy Recovery Unit — Sizes 48/50HJ004-007
MAX WEIGHT A B C
lb kg in. mm in mm in. mm
48HJ004 w/62AQ060 890 404 95.6 2428.20 57.38 1457.30 33.35 847
48HJ004 w/62AQ100 905 411 95.6 2428.20 57.38 1457.30 33.35 847
48HJ005 w/62AQ060 900 409 95.6 2428.20 57.38 1457.30 33.35 847
48HJ005 w/62AQ100 915 415 95.6 2428.20 57.38 1457.30 33.35 847
48HJ006 w/62AQ060 920 418 95.6 2428.20 57.38 1457.30 33.35 847
48HJ006 w/62AQ100 935 425 95.6 2428.20 57.38 1457.30 33.35 847
48HJ007 w/62AQ060 995 452 95.6 2428.20 57.38 1457.30 42.12 1070
48HJ007 w/62AQ100 1010 459 95.6 2428.20 57.38 1457.30 42.12 1070
50HJ004 w/62AQ060 795 361 95.6 2428.20 57.38 1457.30 33.35 847
50HJ004 w/62AQ100 810 368 95.6 2428.20 57.38 1457.30 33.35 847
50HJ005 w/62AQ060 805 365 95.6 2428.20 57.38 1457.30 33.35 847
50HJ005 w/62AQ100 820 372 95.6 2428.20 57.38 1457.30 33.35 847
50HJ006 w/62AQ060 825 375 95.6 2428.20 57.38 1457.30 33.35 847
50HJ006 w/62AQ100 840 381 95.6 2428.20 57.38 1457.30 33.35 847
50HJ007 w/62AQ060 880 400 95.6 2428.20 57.38 1457.30 42.12 1070
50HJ007 w/62AQ100 895 407 95.6 2428.20 57.38 1457.30 42.12 1070