Leak Testing; Refrigerant Charging; Condensate Drain - Rheem RH1T2417STANAA Installation Instructions Manual

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3.9.4 LEAK TESTING

After all braze joints are completed, replace the valve core removed when purging with
nitrogen and then leak test the system by pressurizing to 150 psig with dry nitrogen and
allow the system to sit for at least 15 minutes (longer if possible) to assure the pressure
does not drop.
3.9.5 EVACUATION
If no leaks are detected, evacuate the system down to 500 microns or below before
charging the system or opening the service valves on the outdoor unit which will release
the charge stored in the outdoor unit into the line set and air-handler coil. Failure to
reach 500 microns of vacuum is a sign of a leak or excessive moisture inside the system.

3.9.6 REFRIGERANT CHARGING

Once the evacuation process is completed, break the vacuum with the refrigerant from a
refrigerant cylinder or with refrigerant stored in the outdoor unit by opening the outdoor
unit service valves. The charging process cannot be completed until the remaining
steps in the installation process are completed and the indoor air-flow is adjusted to the
proper level. See Section 4.7 for further details.
3.10 TXV SENSING BULB ATTACHMENT
IMPORTANT: DO NOT perform any brazing with the TXV bulb attached to the vapor
line. After brazing operations have been completed and the tubing has cooled to the
touch, clamp the TXV bulb securely on the vapor line at the 10 to 2 o'clock position (see
Figures 10 and 11) with the strap provided in the parts bag. Insulate the TXV sensing
bulb and suction line with the provided pressure sensitive insulation (size 4" x 7") and
secure with provided wire ties.
IMPORTANT: TXV sensing bulb should be located on a horizontal section of suc-
tion line, just outside of coil box. The copper sensing bulb must never be placed
on any aluminum tube as this will result in galvanic corrosion and eventual failure
of the aluminum tube.
FIGURE 10
BULB LOCATION
10 O'CLOCK
TXV
BULB
VAPOR LINE

3.11 CONDENSATE DRAIN

Consult local codes or ordinances for specific requirements.
IMPORTANT: When making drain fitting connections to the drain pan, use a thin layer of
Teflon paste, silicone or Teflon tape and install hand tight.
IMPORTANT: When making drain fitting connections to drain pan, do not overtighten.
Overtightening fittings can split pipe connections on the drain pan.
• Install drain lines so they do not block service access to front of the unit. Minimum
clearance of 24 inches is required for filter, coil or blower removal and service access.
• Although the condensate drain pan is designed is designed to be self draining, it is
recommended that the air-handler cabinet be pitched slightly downward toward the pri-
mary drain connection to assure the condensate drains completely from the drain pan.
The downward pitch should be approximately 1/8" per foot and in both axes.
2 O'CLOCK
TXV
BULB