170761-UIM-B-0406
Unitary Products Group
3
ROOF INSTALLATION
When installing units on a roof, the structure must be capable of sup-
porting the total weight of the unit, including a pad, lintels, rails, etc.,
which should be used to minimize the transmission of sound or vibra-
tion into the conditioned space.
UNIT PLACEMENT
1.
Provide a base in the pre-determined location.
2.
Remove the shipping carton and inspect for possible damage.
3.
Compressor tie-down bolts should remain tightened.
4.
Position the unit on the base provided.
NOTE: Heat pumps will defrost periodically resulting in water drainage.
The unit should not be located where water drainage may freeze
and create a hazardous condition - such as sidewalks and
steps.
LIQUID LINE FILTER-DRIER
The heat pumps have a solid core bi-flow filter/drier located on the liquid
line.
NOTE: Replacements for the liquid line drier must be exactly the same
as marked on the original factory drier. See Source 1 for O.E.M.
replacement driers.
PIPING CONNECTIONS
The outdoor unit must be connected to the indoor coil using field sup-
plied refrigerant grade copper tubing that is internally clean and dry.
Units should be installed only with the tubing sizes for approved system
combinations as specified in Tabular Data Sheet. The charge given is
applicable for total tubing lengths up to 15 feet. See Application Data
Part Number 036-61920-001 for installing tubing of longer lengths and
elevation differences.
NOTE: Using a larger than specified line size could result in oil return
problems. Using too small a line will result in loss of capacity
and other problems caused by insufficient refrigerant flow. Slope
horizontal vapor lines at least 1" every 20 feet toward the out-
door unit to facilitate proper oil return.
OIL TRAPPING
When the outdoor unit is above the indoor coil oil trapping is necessary.
An oil trap should be provided for every 20 ft. of rise. See Figure 2.
PRECAUTIONS DURING LINE INSTALLATION
1.
Install the lines with as few bends as possible. Care must be taken
not to damage the couplings or kink the tubing. Use clean hard
drawn copper tubing where no appreciable amount of bending
around obstruction is necessary. If soft copper must be used, care
must be taken to avoid sharp bends which may cause a restriction.
2.
The lines should be installed so that they will not obstruct service
access to the coil, air handling system, or filter.
3.
Care must also be taken to isolate the refrigerant lines to minimize
noise transmission from the equipment to the structure.
4.
The vapor line must be insulated with a minimum of 1/2" foam rub-
ber insulation (Armaflex or equivalent). Liquid lines that will be
exposed to direct sunlight and/or high temperatures must also be
insulated.
Tape and suspend the refrigerant lines as shown. DO NOT allow tube
metal-to-metal contact. See Figure 3.
5.
Use PVC piping as a conduit for all underground installations as
shown in Figure 4. Buried lines should be kept as short as possible
to minimize the build up of liquid refrigerant in the vapor line during
long periods of shutdown
6.
Pack fiberglass insulation and a sealing material such as perma-
gum around refrigerant lines where they penetrate a wall to reduce
vibration and to retain some flexibility.
7.
See Form 690.01-AD1V for additional piping information.
Failure to do so or using a substitute drier or a granular type may
result in damage to the equipment.
Filter-Drier
Source 1 Part No.
Apply with Models
YMB / HC3A / HL3A
026 - 25512 - 000
All Sizes
FIGURE 2: Oil Trap
INDOOR
COIL
OUTDOOR COIL
20 Ft.
20 Ft.
10 In.
6 In.
FIGURE 3: Tubing Hanger
FIGURE 4: Underground Installation
Liquid
Line
Incorrect
Correct
Tape
Sheet Metal Hanger
Insulated Vapor Line
TO INDOOR COIL
TO O UTDOOR UNIT
LIQUID LINE
CAP
PVC
CONDUIT
INSULATED
VAPOR LINE
