ICP CHS180, Installation, Start-Up And Service Instructions Manual

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Split System Heat Pumps Installation Instructions
6
WARNING
Recover R--22 holding charge before removing
runaround liquid piping loop. Failure to recover
holding charge before removing piping loop
could result in equipment damage and severe
injury.
MAKE PIPING CONNECTIONS
1. Open service valves in sequence:
a. Discharge service valve on compressor.
b. Suction service valve on compressor.
c. Liquid line valve.
2. Remove 1/4 --in. flare cap from liquid valve Schrader
port.
3. Attach refrigerant recovery device and recover
holding charge.
4. Remove runaround loop.
5. Connect system liquid line from liquid connection of
outdoor unit(CHS) to indoor unit liquid line
connections. Select proper field-- supplied bi--flow
filter driers and install in the liquid line. See Fig. 2.
Install a field--supplied liquid moisture indicator
between the filter drier(s) and the liquid connections
on the indoor unit. Braze or silver alloy solder all
connections.
Pass nitrogen or other inert gas through piping while
making connections to prevent formation of copper oxide.
(Copper oxides are extremely active under high
temperature and pressure. Failure to prevent collection of
copper oxides may result in system component failures.)
VAPOR LINE PIPING PROCEDURE -- Connect system
vapor line to the vapor line stub on the outdoor unit and the
vapor stubs on the indoor unit. At the indoor unit, construct
vapor piping branches as shown in Fig. 3 for good mixing of
the refrigerant leaving the indoor coil during cooling. This
will ensure proper TXV (thermostatic expansion valve)
bulb sensing. Where vapor line is exposed to outdoor air,
line must be insulated. See Table 3 for insulation
requirements.
Table 3 -- Insulation for Vapor Line Exposed to Outdoor Conditions
Length of Exposed Vapor Line* Insulation Thickness
feet meter inches mm
10 3 3/8 10
25 8 1/2 13
35 11 3/4 19
50 15 3/4 19
*Recommended vapor line insulation for piping exposed to outdoor conditions to prevent loss of heating during heating
cycle. When vapor line goes through interior spaces, insulation should be selected to prevent condensation on cooling
cycle. Heating capacity should be reduced 1000 Btuh (295 W) if over 35 ft (11 m) of vapor line with 3/4 in. (19 mm) insulation
is exposed to outdoor conditions.
+Closed cell foam insulation with a thermal conductivity of: 0.28 Btu
•
in./ft 2
•
h
• °
F (0.04W/m
• °
C).
Fig. 3 — Location of Sight Glass(es) and Filter Driers (Typical)
LEGEND
TXV -- Thermostatic Expansion Valve