York D7CG 048 User Manual
DISCONNECT SWITCH BRACKET FOR UNITS
WITH OPTIONAL BELT-DRIVE BLOWER
WITH OPTIONAL BELT-DRIVE BLOWER
A special bracket for mounting a field-supplied disconnect
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
blower compartment taped to the top of the blower housing.
Install the bracket on the left hand side of the unit as shown in
Figure 9. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Matching holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
blower compartment taped to the top of the blower housing.
Install the bracket on the left hand side of the unit as shown in
Figure 9. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Matching holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
GAS PIPING
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length
of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or
of gas flow required, specific gravity of the gas and the length
of run. “National Fuel Gas Code” Z223-1992 (in the U.S.A.), or
the current Gas Installation Codes CAN/CGA-B149.1 and .2 (in
Canada) should be followed in all cases unless superseded by
local codes or gas company requirements. Refer to Table 3.
Canada) should be followed in all cases unless superseded by
local codes or gas company requirements. Refer to Table 3.
CAUTION: Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
dangerous operation. Verify proper operation after
servicing.
FIG. 2 - TYPICAL FIELD WIRING
R E F E R TO E LE C T R IC A L DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
R E F E R TO E LE C T R IC A L DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
TABLES TO SIZE THE DISCONNECT
SWITCH, WIRING & OVERCURRENT
PROTECTION.
TYPICAL POWER WIRING
TYPICAL CONTROL WIRING
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
ADD
JUMPER
JUMPER
1
24 VOLT THERMOSTAT 2TH07701024. IF THE 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 OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.
TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL COMPRESSOR
AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024.
COOLING / HEATING (24 VOLT THERMOSTAT)
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)
24 VOLT
TRANSFORMER
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
ADD
JUMPER
JUMPER
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.
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.
COOLING / HEATING (24 VOLT ELECTRONIC THERMOSTAT)
24 VOLT
TRANSFORMER
UNIT TERMINAL
STRIP TB1
THERMOSTAT
1
TERMINALS
ADD
JUMPER
JUMPER
ADD
JUMPER
JUMPER
4
2
3
4
NOT
USED
USED
TO REMOTE SENSOR
2TH04702224 IF USED
2TH04702224 IF USED
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)
TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
2
SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
3
SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
ELECTRIC HEATER.
4
REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR
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.
OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE
THERMOSTAT SWITCHES TO THE SET-BACK POSITION.
Length in Feet
Nominal Iron Pipe Size
1/2 in.
3/4 in.
1 in.
1-1/4 in.
10
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
100
132
92
73
63
56
50
46
43
40
38
73
63
56
50
46
43
40
38
278
190
152
130
190
152
130
115
105
96
90
84
79
90
84
79
520
350
285
245
215
195
180
170
160
150
350
285
245
215
195
180
170
160
150
1,050
730
590
500
440
400
370
350
320
305
590
500
440
400
370
350
320
305
Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3
inch water column and 0.6 specific gravity gas).
inch water column and 0.6 specific gravity gas).
TABLE 3 - PIPE SIZING
530.18-N8Y
Unitary Products Group
5