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428 01 9702 01
Specifications subject to change without notice.
INSTALLATION
IMPORTANT
: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
R
−
410A refrigerant systems operate at higher pressures than
standard R
−
22 systems. Do not use R
−
22 service equipment
or components on R
−
410A refrigerant equipment.
PERSONAL INJURY AND EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and / or equipment damage.
DO NOT
operate the unit without a filter or with grille
removed.
CAUTION
!
COMPLETE PRE
−
INSTALLATION CHECKS
Unpack Unit
Move the unit to final location. Remove unit from carton, being
careful not to damage service valves and grilles.
Inspect Shipment
File a claim with the shipping company if shipment is damaged or
incomplete. Check the unit nameplates to ensure units match job
requirements.
Consider System Requirements
Consult local building codes and NEC for special installation
requirements.
Allow sufficient space for airflow clearance, wiring, refrigerant
piping, and servicing unit. Locate unit so that condenser airflow is
unrestricted on both sides.
Unit may be mounted on a level pad directly on base legs or
mounted on raised pads at support points.
Matching the Heat Pump to an Indoor Unit
The NH4H4 heat pump units can be matched to corresponding
indoor units. The NH4H4 unit can be matched with under
−
ceiling
and residential fan coils and evaporator coils. Refer to separate
indoor unit literature for more information.
Expansion Device
−
Ducted System Cooling Mode
A hard shutoff, thermostatic expansion valve (TXV) is required at
the indoor section of the system for proper operation of these
products. If the indoor section of the system is not equipped with a
hard shutoff TXV, refer to Spec Sheet for the correct TXV kit to be
installed. Follow the instructions in the kit for proper installation.
Check AccuRater Metering Device
−
Heating Mode
The correct AccuRater (bypass type) refrigerant control is required
for system capacity optimization. An AccuRater device with
field
−
replaceable piston is supplied with the outdoor unit (see Fig.
2).
Do not
interchange components between the AccuRater device
types. Matching of outdoor unit with indoor unit may require field
replacement of piston. Replace piston, if required, before
connecting refrigerant lines. See Fig. 2. Piston replacement
instructions are included in the indoor unit installation instructions.
After system installation is complete, see the Refrigerant Charging
section in this document to check and/or adjust refrigerant charge.
*
NOTE:
Piston Orientation - Install tapered end
of piston in the direction of the outdoor equipment
for proper heating operation
*
A07407b
Fig. 2
-
AccuRater (bypass type)
Metering Device Components
RIG AND MOUNT UNIT
Mounting on Ground
Mount unit on a solid, level concrete pad. Position unit so water or
ice from roof does not fall directly onto unit. Use field
−
provided
snow stand or ice rack where prolonged subfreezing temperatures
or heavy snow occurs.
If conditions or local codes require unit be fastened to a pad, 6
field
−
supplied tie
−
down bolts should be used and fastened through
slots provided in unit mounting feet.
Mounting on Roof
Mount unit on a level platform or frame at least 6 in. (152.4 mm)
above roof surface. Isolate unit and tubing from structure.
Clearance Requirements
Single Unit Applications: With coil facing wall: Allow 6” (152.4
mm) minimum clearance on coil side and coil end and 20” (504.0
mm) minimum clearance on fan side. Allow 24” (609.6 mm)
minimum clearance on compressor end for service.
With fan facing wall: Allow 8” (203.2 mm) minimum clearance on
fan side and coil end and 20” (504.0 mm) minimum clearance on
coil side. Allow 24” (609.6 mm) minimum clearance on
compressor end for service when units are stacked or there is less
than 40” (1016 mm) of clearance above the unit. If there is 40”
(1016 mm) clearance above unit and the top panel is accessible for
removal allow 8” (203.2 mm) minimum clearance on compressor
end for service.
Multi
−
unit Applications: Allow 24” (609.6 mm) minimum
clearance between fan and coil sides of multiple units. Arrange
units so discharge of one does not enter inlet of another. Allow 24”
(609.6 mm) minimum clearance on compressor end when units are
stacked or there is less than 40” (1016 mm) of clearance above the
unit. If there is 40” (1016 mm) clearance above unit and the top
panel is accessible for removal allow 8” (203.2 mm) minimum
clearance on compressor end for service.
When two units are installed end to end with the coil ends facing
each other allow 12” (304.8 mm) minimum clearance between
units.
IMPORTANT
: When installing multiple units, ensure the
discharge air from one unit is not drawn into another unit. When
installing single or multiple units in an alcove, roof well, or
partially enclosed area, ensure there is adequate ventilation to
prevent recirculation of discharge air.