Differential Enthalpy Control Wiring | Carrier 33CSPREMLK instruction

120 VAC LINE VOLTAGE

24 VAC

SECONDARY

24 VAC OUTPUT FROM N/C CONTACT WHEN THE OUTDOOR ENTHALPY IS LESS THAN THE INDOOR ENTHALPY

(ENABLE ECONOMIZER)

24 VAC OUTPUT FROM N/O CONTACT WHEN THE OUTDOOR ENTHALPY IS GREATER THAN THE

OUTDOOR ENTHALPY

(ENABLE ENERGY RECYCLER)

HI LOW GND 24	4-20 24-36
ENTHALPY VAC	mA	VDC
	IN	OUT

24-36 4-20 VDC mA

IN OUT

LEGEND

N/C — Normally Closed

N/O — Normally Open

33CSENTHSW

JUMPER SETTINGS FOR 33CSENTHSW

M3	M2	M1	OFF	100%	50%	0%

33CSENTSEN

JUMPER SETTINGS FOR 33CSENTSEN

M3	M2	M1	OFF	100%	50%	0%

Fig. 21 — Differential Enthalpy Control Wiring

Wiring Enthalpy Sensors — To wire the enthalpy sensor, per- form the following (see Fig. 24 and 25):

NOTE: To mount outdoor air sensor remotely, remove it from back of enthalpy control and follow steps 3 and 6.

1.Use a 2-conductor, 18 or 20 AWG, twisted pair cable to connect the return air enthalpy sensor to the differential enthalpy control. Use a 4-conductor, 18 or 20 AWG cable to connect the enthalpy control to the PremierLink con- troller and power transformer.

2.At the differential enthalpy control remove the factory- installed resistor from the SR and (+) terminals.

3.Connect the RED wire from the 2-conductor cable which originates from the return air enthalpy sensor to the SR (+) terminal. Connect the BLK wire to the SR (–) terminal.

4.Connect the following 4 wires from the 4-wire conduc- tive cable to the differential enthalpy controller:

a.Connect the RED wire to the 24 vac terminal (TR1) on enthalpy control and to pin 1 on 12-pin harness.

b.Connect the BRN wire to the 24 vac GND terminal (TR) on enthalpy sensor and to pin 4 on 12-pin harness.

c.Connect the ORN wire to J4-2 on PremierLink controller and to terminal 3 on enthalpy sensor.

d.Connect the RED wire to J4-1 on PremierLink controller and to terminal 2 on enthalpy sensor.

5.At the return air enthalpy sensor, strip 3 in. of jacket from

the cable and remove 1/2 in. of insulation from each conductor.

6.Connect the RED wire to (+) spade connector on the sensor. Connect the BLK wire to (S) spade connector on the sensor. Use wire nuts or closed-end crimp-type con- nectors to fasten the connections securely. See Fig. 22.

Economizer — The PremierLink™ controller will inter- face with the 40RM economizer. Economizers will contain a Honeywell actuator (Honeywell part number M7415).

An adapter (Honeywell part number Q769B or Q769C is preferred) must be used to enable the 4 to 20 mA signal from the PremierLink controller to control the position of the econo- mizer. Refer to Honeywell Q769B and Q769C accessory in- stallation instructions for wiring details.

Disconnect power supply before making wiring connec- tions to prevent electrical shock and equipment damage.

To avoid permanent damage to the PremierLink 4 to 20 mA connection, a signal loop isolator must be installed when using the Q769B adapter.