Carrier 19FA Betriebsanleitung PDF herunterladen (Seite 17)

HVAC Training

Page : 17 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

This modification will require two adjustments.

Change the oil sump temperature setpoint:

The se tpoint cha nge require s the chille r to be shutdow n w hile the controlle r is being a djusted.

Remove the cover from the oil sump temperature controller.

Adjust the oil sump temperature setpoint to 155°F ± 5°F.

Verify that the oil sump temperature controller is cycling the heater on and off to maintain

temperature.

Adjust lube oil cooler temperature control valve:

The control valve adjustment will require the chiller to be in operation while the oil cooler outlet

throttle valve is adjusted to the higher temperature range.

Remove the administrative control lock on the oil cooler outlet valve.

Adjust the oil cooler outlet valve to maintain oil sump temperature 155°F ± 5°F.

Replace the administrative control lock on the oil cooler outlet valve.

What could cause the chiller to trip on low oil pressure?

CRDR# 2934843 Document an occurrence of a U-2 Essential chiller trip due to restricted oil

flow.

On October 17, 2006, HVAC had completed maintenance on 2MECBE01, Essential C hiller and

returned the Chiller to Operations. This maintenance included replacement of the oil pump

filters.

Two filters are utilized on the oil pump. They are installed in tandem (i.e. one stacked

on top of the other). Loose woven felt gaskets are placed on the top and bottom of each

filter. The filters are inserted into the filter canister and rest on top of a spring. A cone

shaped tube slightly protrudes down from the mounting area; this assists in aligning the

upper filter and gasket onto the mounting area. Once aligned the technician must exert

upward pressure, to overcome the spring tension, while sliding the filter canister over the

O-ring seal and hold the filter canister housing against the mounting area. Next the

technician must screw on a collar to secure the assembly in place. Access to this work

area is restricted; piping and supports hamper access and obscure the technician vision.

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Carrier 19FA Betriebsanleitung Seite 17