Converting Horizontal Discharge Units To Downflow (Vertical) Discharge - Carrier 50HS018 Installation, Start-Up And Service Instructions Manual

CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE — The 50HS
units are shipped in a horizontal configuration. To convert a
horizontal unit for downflow (vertical) discharge, perform
the following steps:
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
1. Open all electrical disconnects before starting any serv-
ice work.
2. Remove indoor coil access panel (Fig. 12). Save screws.
3. Locate lances in basepan insulation that are placed over
the perimeter of the vertical duct opening cover
(Fig. 13).
4. Using a straight edge and sharp knife, cut and remove
the insulation around the perimeter of the cover. Re-
move the screws securing the cover to the basepan and
slide out the cover. Discard the cover (Fig. 14).
5. Remove indoor blower access panel (Fig. 15). Save screws.
6. Disconnect indoor-fan motor leads from indoor-fan
relay and unit contactor (Fig. 16). Carefully disengage
wire tie containing indoor-fan motor leads from the unit
control box.
7. Remove screws (Fig. 17) securing indoor blower hous-
ing to blower shelf and carefully slide out blower hous-
ing. On sizes 018-042 there is a filler bracket attached
to the blower shelf; remove this filler bracket and retain
for later use.
8. Locate lances in basepan insulation that are placed over
the perimeter of the vertical discharge opening cover
(Fig. 18).
9. Using a straight edge and sharp knife, cut the insulation
around the perimeter of the cover. Remove the screws
securing the cover to the basepan and slide out the cover
(Fig. 19). Discard the cover. Install filler bracket re-
moved in Step 7, if any.
10. If unit ductwork is to be attached to vertical opening
flanges on the unit basepan (jackstand applications only),
do so at this time.
11. It is recommended that the basepan insulation around
the perimeter of the vertical opening be secured to the
basepan with aluminum tape to prevent the insulation
from tearing or bunching up when the blower housing is
installed in the vertical discharge position.
12. Orient blower housing for vertical airflow (blower mo-
tor adjacent to horizontal duct opening) and slide into
vertical opening making sure the flanges on the blower
side plates engage the tabs in the unit basepan.
Resistance will be felt as the blower housing contacts
the basepan insulation; this can be overcome by apply-
ing a slight force to the base of the blower. Continue
sliding blower in until hole in side plate flange aligns
with the hole in the basepan.
Secure using screws removed in Step 7. Reconnect indoor-
fan motor leads and insert wire tie back into unit control
box (Fig. 16).
13. Cover the horizontal duct openings. Duct covers can be
ordered as an accessory or be field-fabricated as shown
in Fig. 20.
14. Reinstall the indoor coil and indoor blower access
panels.
15. After completing unit installation, perform all safety checks
and power up unit.
Fig. 12 — Indoor Coil Access Panel
Fig. 13 — Basepan Insulation Over
Vertical Duct Opening
Fig. 14 — Insulation and Cover Removed
from Vertical Duct Opening
11
ACCESS PANEL
SCREWS