Allied EL072XP Informasi Unit - Halaman 13

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NOTE - Remove cores from service valves if not already done.

OUTDOOR UNIT

VACUUM PUMP

NITROGEN

C- Refrigerant Charge

The ELXP units have a factory holding charge of 2 pounds

of HFC-410A in each circuit. Additional refrigerant will

need to be added during installation. Charge using the

HFC-410A charging information label provided in the unit.

The HFC-410A charging information label in the unit ap-

plies to Indoor and Outdoor unit with same full load ca-

pacity, see table below. For all other unit matches, please

contact Commercial Application department for Charging

Procedure Information (form # 508349-01).

V- SEQUENCE OF OPERATION

COOLING MODE

First Stage Cooling Call

Y1 thermostat demand from Air handler energizes 24VAC

signal to TB14-C1 connection.

TB14-C1 voltage energizes CMC1-O terminal. CMC1 de-

frost board energizes the L1 reversing valve solenoid.

TB14-C1 voltage passes through N.C. K8-2 contacts en-

ergizing CMC1-Y1 terminal.

CMC1 energizes the CMC1-Y1 OUT terminal energizing

the K1 compressor contactor (assuming S87 low pres-

sure switch and S4 high pressure switch remain closed).

Then, energized CMC1-Y1 OUT voltage passes through

CMC1 N.C. fan relay energizing K10 fan relay.

K1-1 closes, energizing B1 compressor on low speed.

K1-2 opens to de-energize HR1 crankcase heater.

K10-1 closes, energizing outdoor fan B4 and B5.

NOTE – When high voltage power is applied to unit, K1-2

N.C. energizes HR1 crankcase heater.

MICRON GAUGE

A34000 1/4 SAE

TEE WITH

SWIVEL

COUPLER

Connect low side of manifold gauge set with 1/4 SAE in-line tee to suction line

service valve

Connect high side of manifold gauge set to liquid line service valve

Connect micron gauge available connector on the 1/4 SAE in-line tee.

HFC-410A

Connect the vacuum pump (with vacuum gauge) to the center port of the

manifold gauge set. The center port line will be used later for both the

HFC-410A and nitrogen containers.

FIGURE 10

Page 13

TO SUCTION

SERVICE VALVE

Second Stage Cooling Call

Y2 thermostat demand from Air handler energizes 24VAC

signal to TB14-C2 connection.

TB14-C2 signal passes though K8-3 N.C. energizing K67

Stage 2 Relay.

K67-1 closes, energizing L34 Solenoid shifting B1 com-

pressor to high speed.

HEATING MODE

Heating Call

W1 thermostat demand from air handler energizes 24VAC

signal to TB14-H1 connection.

TB14-H1 signal energizes K8 transfer relay.

K8-2 closes, energizing CMC1-Y1 terminal.

CMC1 energizes the CMC1-Y1 OUT terminal energizing

the K1 compressor contactor (assuming S87 low pres-

sure switch and S4 high pressure switch remain closed).

Then, energized CMC1-Y1 OUT voltage passes through

CMC1 N.C. fan relay energizing K10 fan relay.

K1-1 closes, energizing B1 compressor on low speed.

K1-2 opens to de-energize HR1 crankcase heater.

K10-1 closes, energizing outdoor fan B4 and B5.

K8-3 closes, energizing K67 Stage 2 relay.

K67-1 closes, energizing L34 solenoid shifting B1 com-

pressor to high speed.

NOTE – When high voltage power is applied to unit, K1-2

N.C. energizes HR1 crankcase heater.

MANIFOLD

GAUGE SET

TO LIQUID

LINE SERVICE

VALVE

RECOMMEND MINIMUM

3/8" HOSE