Lennox 13HPX Series Unit Information page 18

3. Check condensate line and clean if necessary.
Indoor Unit
1. Clean or change filters.
2. Lennox blower motors are prelubricated and permanent-
ly sealed. No more lubrication is needed.
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
Motor nameplate__________Actual__________.
At the beginning of each heating or cooling season, the
system should be cleaned as follows:
V − BRAZING
Before brazing remove access panels and any piping pan-
els to avoid burning off paint. Be aware of any components
ie, service valves, reversing valve, pressure switches that
may be damaged due to brazing heat.
When making line set connections, use 1 to 2 psig dry nitro-
gen to purge the refrigerant piping. This will help to prevent
oxidation into the system.
WARNING
Danger of explosion: Can cause equipment damage,
injury or death. When using a high pressure gas
such as dry nitrogen to pressurize a refrigeration or
air conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9 to 13.8
kPa).
1 − .Cut ends of copper square (free from nicks or dents).
Debur the ends. The pipe must remain round, do not
pinch end of line.
2 − Wrap wet rag around any components that may be da-
maged.
3 − Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper to copper brazing or 45 percent
silver alloy for copper to brass or copper to steel braz-
ing) which are rated for use with R−22 and R−410A re-
frigerant.
4 − After brazing quench the joints with a wet rag to prevent
possible heat damage to any components.
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