York D7CG 048 Typical Field Wiring, Disconnect Switch Bracket For Units, Pipe Sizing, Gas Piping

530.18-N8Y

TYPICAL CONTROL WIRING

COOLING / HEATING (24 VOLT THERMOSTAT) COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)

THERMOSTAT1		THERMOSTAT	1
TERMINALS
		TERMINALS		UNIT TERMINAL
UNIT TERMINAL
				STRIP TB1
STRIP TB1					24 VOLT
	ADD				TRANSFORMER
ADD
	JUMPER			2
JUMPER
24 VOLT
TRANSFORMER		4		3
		NOT
	ADD	USED		4
	JUMPER

			TO REMOTE SENSOR
1 24 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER,			2TH04702224 IF USED
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD	1	ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)
TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL COMPRESSOR
		TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER
AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
		J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.	2	SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)	3	SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
		ELECTRIC HEATER.

THERMOSTAT1

4 REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR

TERMINALS

ADD

JUMPER

UNIT TERMINAL

STRIP TB1

P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY

OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE

THERMOSTAT SWITCHES TO THE SET-BACK POSITION.

1 ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).

IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND

10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE

SCROLL COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE

ECONOMIZER ON A SECOND STAGE OF COOLING, USE THERMOSTAT 2ET04700224.

24VOLT

TRANSFORMER

CAUTION: Label all wires prior to disconnection when servic- ing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

TYPICAL POWER WIRING

REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, WIRING & OVERCURRENT PROTECTION.

REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, WIRING & OVERCURRENT PROTECTION.

FIG. 2 - TYPICAL FIELD WIRING

DISCONNECT SWITCH BRACKET FOR UNITS		the current Gas Installation Codes CAN/CGA-B149.1 and .2 (in
WITH OPTIONAL BELT-DRIVE BLOWER		Canada) should be followed in all cases unless superseded by
A special bracket for mounting a field-supplied disconnect		local codes or gas company requirements. Refer to Table 3.
		TABLE 3 - PIPE SIZING
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
				Nominal Iron Pipe Size
blower compartment taped to the top of the blower housing.		Length in Feet
Install the bracket on the left hand side of the unit as shown in			1/2 in.	3/4 in.	1 in.	1-1/4 in.
		10	132	278	520	1,050
Figure 9. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used		20	92	190	350	730
for mounting the bracket. Screws should be loosened only -		30	73	152	285	590
NOT REMOVED.	Matching holes in the bracket have	40	63	130	245	500
elongated keyways	allowing easy installation. Re-tighten	50	56	115	215	440
screws after bracket is in place to ensure panels will remain		60	50	105	195	400
		70	46	96	180	370
leak tight.
		80	43	90	170	350
GAS PIPING
		90	40	84	160	320
Proper sizing of gas piping depends on the cubic feet per hour		100	38	79	150	305
of gas flow required, specific gravity of the gas and the length		Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3
of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or		inch water column and 0.6 specific gravity gas).

Unitary Products Group 5