heatcraft-refrigeration-p h-im-fl1a User Manual

Field Wiring

WARNING: All wiring must be done in accordance with

applicable codes and local ordinances.

The ﬁeld wiring should enter the areas as provided on the unit.

The wiring diagram for each unit is located on the inside of the

electrical panel door. All ﬁeld wiring should be done in a profes-

sional manner and in accordance with all governing codes.

Before operating unit, double check all wiring connections,

including the factory terminals. Factory connections can vibrate

loose during shipment.

1. The nameplate on the unit is marked with the electrical

characteristic for wiring the unit.

2. Consult the wiring diagram in the unit cooler and in the

condensing unit for proper connections.

3. For air cooled condensers, due to multiple low amp motors,

we recommend using time delay fuse protection instead of

circuit breakers.

Check Out and Start Up

After the installation has been completed, the following points

should be covered before the system is placed in operation:

(a) Check all electrical and refrigerant connections. Be

sure they are all tight.

(b) Check high and low pressure controls, pressure

regulating valves, oil pressure safety controls, and all

other safety controls, and adjust if necessary.

and adjust.

(d) Wiring diagrams, instruction bulletins, etc. attached

to the condensing units should be read and ﬁled for

future reference.

(e) All fan motors on air cooled condensers, evaporators,

etc. should be checked for proper rotation. Fan motor

mounts should be carefully checked for tightness and

proper alignment.

(f) Electric and hot gas evaporator fan motors should be

temporarily wired for continuous operation until the room

temperature has stabilized.

(g) Observe system pressures during charging and initial

operation. Do not add oil while the system is short of

refrigerant unless oil level is dangerously low.

(h) Continue charging until system has sufﬁcient refrigerant

for proper operation. Do not overcharge. Remember that

bubbles in a sight glass may be caused by a restriction

as well as a shortage of refrigerant.

(i) Do not leave unit unattended until the system has

reached normal operating conditions and the oil charge

has been properly adjusted to maintain the oil level at the

center of the sight glass.

CAUTION: Extreme care must be taken in starting compressors

for the ﬁrst time after system charging. At this time,

all of the oil and most of the refrigerant might be in

the compressor creating a condition which could

cause compressor damage due to slugging.

Activating the crankcase heater for 24 hours prior

to start-up is required. If no crankcase heater is

present, then directing a 500 watt heat lamp or

other safe heat source on the lower shell of the

compressor for approximately thirty minutes will be

beneﬁcial in eliminating this condition which might

never reoccur.

WARNING: Scroll compressor is directional dependent.

If noisy, change phase of input wiring.

Refrigerant Charging Instructions

1. Install a liquid line drier in the refrigerant supply line

between the service gauge and the liquid service port

of the receiver. This extra drier will insure that all refrigerant

supplied to the system is clean and dry.
2. When initially charging a system that is in a vacuum, liquid

refrigerant can be added directly into the receiver tank.
3. Check serial data tag attached to the unit for refrigerant

capacity. System refrigerant capacity is 90% of receiver

capacity. Do not add more refrigerant than the data tag

indicates. Weigh the refrigerant drum before charging so

an accurate record can be kept of the weight of refrigerant

put in the system.
4. Start the system and ﬁnish charging until the sight glass

indicates a full charge and the proper amount has been

weighed in. If the refrigerant must be added to the system

through the suction side of the compressor, charge in

vapor form only. Liquid charging must be done in the

high side only or with liquid metering devices to protect

the compressor.