157650-UIM-B-1105
Unitary Products Group
3
OUTDOOR THERMOSTATS
(All installations of this heat pump in Manufactured Homes built
per HUD standards SHALL have an outdoor thermostat installed at
the time of installation by the installer. In accordance with HUD
std. 3280.714 (a) (1) (ii). Outdoor thermostat, Part number 3024-
6881/D shall be used and should be ordered at your nearest UPG
Parts Source). See last page of these instructions. Select the proper
location for mounting the outdoor thermostat (see instructions packed
with outdoor thermostat).
INDOOR UNITS
Install the indoor coil in the furnace or air handler according to the
installation instructions packed with each component.
REFRIGERANT LINES
IMPORTANT: Do not remove protective caps from couplings until pre-
charged lines are routed and ready for final connection. Protective caps
prevent dirt from entering couplings and contaminating system when
connected together.
1.
Check size and length of pre-charged refrigerant lines before
installing.
a.
Check the size of the pre-charged refrigerant lines to insure
that they are correct for the model being installed.
b.
Check the final routing of the tubing, and insure tubing will be
of adequate length, with allowance for connection at the coil
and outdoor unit.
The line set part number, size, and length are shown in the tabular data
sheet. Do not use any line sets other than those shown.
2.
Copper tubing will work-harden.
a.
The pre-charged tubing should be handled carefully.
b.
Do not bend or work the tubing any more than necessary.
(The larger size tubing 3/4" for example, will work-harden
rapidly as it is formed. As the tubing becomes harder, it is
more susceptible to kinking and damage).
3.
Forming Copper.
a.
No attempt should be made to bend the suction line in a
shorter radius than 12". See Figure 2.
4.
How to dispose of excess tubing.
a.
Tubing may be longer than required. Coil excess tubing
nearer the indoor coil rather than the outdoor unit.
b.
Excess tubing must be coiled horizontally so the flow of
refrigerant is from top to bottom of the coil and toward the
outdoor unit. Another method is to form a horizontal “U” large
enough to take care of excess. See Figure 3.
5.
Slope tubing toward outdoor unit.
a.
When the coil is above the outdoor unit, the suction line
should be sloped with a fall of a least 1/4" per foot toward the
outdoor unit.
b.
When the outdoor unit is above the coil, the tubing should be
sloped downward along lateral distance to the bottom, or
from the vertical riser.
6.
Insulation of suction line.
a.
Standard suction lines come pre-insulated from the factory
with 3/8" closed cell insulation, adequate for average installa-
tions.
NOTE: In regions of extreme temperatures and humidity, additional
insulation may be required to prevent excessive condensation and seri-
ous loss of capacity.
b.
Do not insulate liquid and suction lines together.
c.
Liquid lines should not be insulated.
d.
Liquid lines should not be in bare contact with suction line.
See Figure 4.
FIGURE 2: Minimum Suction Line Form
12”
12”
Center Point
FIGURE 3: Excess Tubing
FIGURE 4: Insulation of Vapor Line
Liquid refrigerant under pressure. Liquid refrigerant can cause
severe frostbite. To avoid possible loss of sight and/or frostbite
use eye protection (safety glasses or safety face shield). Wearing
leather gloves will offer protection to hands.
Liquid
Line
Incorrect
Correct
Tape
Sheet Metal Hanger
Insulated Vapor Line
