Lubrication Control; Shutdown; Before Initial Start-Up; Job Data Required - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

Lubrication Control

As part of the pre-start checks executed by the controls, the oil
sump temperature is compared to the evaporator saturated re-
frigerant temperature. If the oil temperature is less than 140F
(60C) and less than evaporator saturated refrigerant tempera-
ture plus 50F (27.8C), the start-up will be delayed until either
of these conditions is no longer true. Once this temperature is
confirmed, the start-up continues.
The oil heater relay is energized whenever the chiller compressor
is off and the oil sump temperature is less than 140F (60C) or
the oil sump temperature is less than the evaporator saturated re-
frigerant temperature plus 53F (29.4C). The oil heater is turned
off when either of the following conditions is true:
• Oil sump temperature is more than 152F (66.7C)
• Oil sump temperature is more than 144F (62.2C) and
more than the evaporator saturated refrigerant temperature
plus 55F (30.6C)
The oil heater is always off when the compressor is running.
The oil pump is also energized for 30 seconds after each 30
minutes of oil heat relay being energized in order to stir the oil
for more evenly distributed heating. For 19XR6/7 the oil pump
stir frequency has options.
A B
A — START INITIATED: Pre-start checks are made; evaporator pump
started.*
B — Condenser water pump started (5 seconds after A).
C — Water flows verified (30 seconds to 5 minutes maximum after B). Chilled
water temperatures checked against control point. Guide vanes checked
for closure. Oil pump started; tower fan control enabled.
D — Oil pressure verified (15 seconds minimum, 300 seconds maximum
after C).
E — Compressor motor starts; compressor ontime and service ontime start,
15-minute inhibit timer starts (10 seconds after D), total compressor starts
advances by one, and the number of starts over a 12-hour period
advances by one.
F — SHUTDOWN INITIATED — Compressor motor stops; compressor
ontime and service ontime stop, and 1-minute inhibit timer starts.
G — Oil pump and evaporator pumps de-energized (60 seconds after F). Con-
denser pump and tower fan control may continue to operate if condenser
pressure is high. Evaporator pump may continue if in RECYCLE mode.
O/A — Restart permitted (both inhibit timers expired: minimum of 15 minutes
after E; minimum of 1 minute after F).
*
Auto Restart After Power Failure Timing sequence will be faster.
Fig. 16 — Control Timing Sequence for Normal Start-Up

Shutdown

The unit can be stopped locally using the HMI by pressing the
green Start/Stop icon . The Unit Start/Stop screen is dis-
played. Press Confirm Stop (see Fig. 17).
C D E
F G O/A
Fig. 17 — Confirm Stop

BEFORE INITIAL START-UP

Job Data Required

• list of applicable design temperatures and pressures (prod-
uct data submittal)
• chiller certified prints
• starting equipment details and wiring diagrams
• diagrams and instructions for special controls or options
• 19XR Installation Instructions

Equipment Required

• mechanic's tools (refrigeration)
• digital volt-ohmmeter (DVM)
• true RMS (root mean square) digital multimeter with
clamp-on current probe or true RMS digital clamp-on am-
meter for at least 480 vac
• electronic leak detector
• absolute pressure manometer or wet-bulb vacuum indicator
(see Fig. 18)
• insulation tester for compressor motor rated at motor design
voltage
Fig. 18 — Electronic Micron Gage

Remove Shipping Packaging

Remove any packaging material from the unit and starter.

Open Oil Circuit Valves

Check to ensure the oil filter isolation valves are open by re-
moving the valve cap and checking the valve stem.
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