york unit standard or ambiant control

[rmtech]

could someone please explain the difference between the settings on a york condensor that askes if you want ambiant or standard control.

thanks

[Brian_UK]

Don't know which model you are asking about but have taken the following from a YCUL document found via Google.

YCUL CONDENSING UNIT AMBIENT
CONTROL
The standard units are designed to operate in outdoor
ambient temperatures of 25°F (-3.9°C) to 115°F (46.1°C).
When the YCUL operates with an economizer system,
experience suggests that the low ambient control should
be programmed to the 40 F to 45 F range. Extremely
low loads will cause refrigerant control and compressor
cycling problems. (See the hot gas bypass section 3)
For those applications where these units can operate
below 25°F or with economizer systems below the 40 F
outdoor range, the YCUL must include the optional low
ambient kit. For operation above 115°F, the optional
high ambient kit is needed for operation up to 125°F.

+
Hope this helps.

[sedgy]

hi rmtec,
I seam to remember york had a very unusual controle on number one condencer fan it went the wrong way on start up, as the hphg went up the number one fan using a second macanical interlocking contactor changed direction, then, went in the < correct direction < as did all the rest of the fans, hope this helps

[johntheboy]

On some machines York used a reverse cycled fan (down Draft) on start up so under low ambient conditions to prevent overcondensing as in reverse the air flow is greatly reduced. If you look in the electrical panel you should see an extra contactor for the first stage fan. That means it is fitted for low ambient.