Carrier RHW036-060, Installation Instructions Manual, Page: 12 / 44

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Specifications subject to change without notice.
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Fig. 13 — Economizer Filter Installation
Step 9 — Units with Hinged Panels Only
If the unit does not have hinged panels, skip this step and
continue at Step 10 below.
Relocate latch shipped inside the compressor compartment
behind the hinged compressor door to location shown in
Fig. 14 after unit installation.
Fig. 14 — Compressor Door Latch Location
Step 10 — Install External Condensate Trap
and Line
The unit has one
3
/
4
-in. condensate drain connection on the
end of the condensate pan and an alternate connection on
the bottom. See Fig. 15. Unit airflow configuration does not
determine which drain connection to use. Either drain con -
nection can be used with vertical or horizontal applications.
Fig. 15 — Condensate Drain Pan (Side View)
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a
1
/
2
-in.
square socket drive extension) and install it in the side
drain connection.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 16.
NOTE: If the alternate bottom drain is not used check the
drain plug for tightness prior to setting the unit on the roof
curb.
Fig. 16 — Condensate Drain Piping Details
All units must have an external trap for condensate drain -
age. Install a trap at least 4-in. (102 mm) deep and protect
against freeze-up. If drain line is installed downstream from
the external trap, pitch the line away from the unit at 1-in.
per 10 ft (25 mm in 3 m) of run. Do not use a pipe size
smaller than the unit connection (
3
/
4
- in.).
Step 11 — Make Electrical Connections
NOTE: Field-supplied wiring shall conform with the limita -
tions of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional powered convenience outlet, the
power source leads to the convenience outlet’s transformer
primary are not factory connected. Installer must connect
these leads according to required operation of the conve -
nience outlet. If an always-energized convenience outlet op -
eration is desired, connect the source leads to the line side
of the unit-mounted disconnect. (Check with local codes to
ensure this method is acceptable in your area.) If a de-ener -
gize via unit disconnect switch operation of the convenience
outlet is desired, connect the source leads to the load side
of the unit disconnect. On a unit without a unit-mounted dis -
connect, connect the source leads to compressor contactor
C and indoor fan contactor IFC pressure lugs with unit field
power leads. See Convenience Outlets on page 14 for pow -
er transformer connections.
The field power wires are connected to the unit at line-
side pressure lugs on compressor contactor C and indoor
fan contactor IFC (see wiring diagram label for control
box component arrangement) or at factory-installed
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
COMPRESSOR DOOR OUTDOOR COIL
LATCH
DRAIN
(FACTORY-IN
S TALLED)
PLUG
CONDEN S ATE PAN ( S IDE VIEW)
S TANDARD
S IDE DRAIN
ALTERNATE
BOTTOM DRAIN
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Unit cabinet must have an uninterrupted, unbroken
electrical 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 compartment, or conduit approved for electrical
ground when installed in accordance with NEC; ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical
Code CSA [Canadian Standards Association] C22.1),
and local electrical codes.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap is recommended.
MINIMUM PITCH
1˝ (25 mm) PER
1
0´ (
3 m) OF LINE
BA S E RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
S EE NOTE
3 ˝ (76 mm)
MIN