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INSTALLATION OF SUPPLY AND RETURN HOSE
KIT — Follow these piping guidelines.
1. Install a drain valve at the base of each supply and return
riser to facilitate system flushing.
2. Install shutoff/balancing valves and unions at each unit to
permit unit removal for servicing.
3. Place strainers at the inlet of each system circulating
pump.
4. Select the proper hose length to allow slack between con-
nection points. Hoses may vary in length by +2% to –4%
under pressure.
5. Refer to Table . Do not exceed the minimum bend radius
for the hose selected. Exceeding the minimum bend radi-
us may cause the hose to collapse, which reduces water
flow rate. Install an angle adapter to avoid sharp bends in
the hose when the radius falls below the required mini-
mum.
NOTE: Piping must comply with all applicable codes.
Table 3 — Metal Hose Minimum Bend Radii
HOSE DIAMETER (in.)
1
/
2
3
/
4
1
Insulation is not required on loop water piping except where
the piping runs through unheated areas or outside the building
or when the loop water temperature is below the minimum ex-
pected dew point of the pipe ambient. Insulation is required if
loop water temperature drops below the dew point.
CAUTION
Do not bend or kink supply lines or hoses.
Pipe joint compound is not necessary when Teflon* thread-
ed tape is pre-applied to hose assemblies or when flared-end
connections are used. If pipe joint compound is preferred, use
compound only in small amounts on the male pipe threads of
the fitting adapters. Prevent sealant from reaching the flared
surfaces of the joint.
NOTE: When anti-freeze is used in the loop, assure that it is
compatible with Teflon tape or pipe joint compound employed.
Maximum allowable torque for brass fittings is 30 ft-lb. If a
torque wrench is not available, tighten finger-tight plus one
quarter turn. Tighten steel fittings as necessary.
Optional pressure-rated hose assemblies designed specifi-
cally for use with Carrier units are available. Similar hoses can
be obtained from alternate suppliers. Supply and return hoses
are fitted with swivel-joint fittings at one end to prevent kink-
ing during installation.
CAUTION
Backup wrench is required when tightening water connec-
tions to prevent water line damage.
MINIMUM BEND RADII (in.)
1
2
/
2
4
1
5
/
2
Refer to Fig. 8 for an illustration of a supply/return hose kit.
Male adapters secure hose assemblies to the unit and risers. In-
stall hose assemblies properly and check them regularly to
avoid system failure and reduced service life.
CRIMPED
(2 ft LENGTH STANDARD)
Fig. 8 — Supply/Return Hose Kit
Step 8 — Wire Field Power Supply
To avoid possible injury or death due to electrical shock,
open the power supply disconnect switch and secure it in
an open position during installation.
Operating the unit with improper line voltage or with
excessive phase imbalance is hazardous to the unit and
constitutes abuse and is not covered under warranty.
All field wiring must comply with local and national fire,
safety and electrical codes. Power to the unit must be within the
operating voltage range indicated on the unit's nameplate.
Properly sized fuses or HACR circuit breakers must be in-
stalled for branch circuit protection. See unit nameplate for
maximum fuse or breaker size. The unit is provided with a con-
centric knock-out for attaching common trade sizes of conduit;
route power supply wiring through this opening. Always con-
nect the ground lead to the grounding lug provided in the con-
trol box and power leads to the line side of compressor contac-
tor as indicated on the wiring diagram. See Fig. 9 and 10 for
control box layout. See Tables 4-6 for additional electrical data.
Units supplied with internal electric heat require two sepa-
rate power supplies: Unit compressor and electric heat, blower
motor and control circuit. Refer to Fig. 11-18. See data plate for
minimum circuit ampacities and maximum fuse/breaker sizing.
11
SWIVEL
BRASS
FITTING
RIB
LENGTH
WARNING
CAUTION
BRASS
FITTING
MPT
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