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66324-YIM-B-1004

Unitary Products Group

15

SEQUENCE OF OPERATION

The unit is controlled by a conventional four wire heating/
cooling thermostat common to this class of equipment.

HEATING

When the thermostat calls for HEAT, the thermostat terminal
W is energized, energizing the combustion air blower.

After airflow is established, the air proving switch closes, the
hot surface ignitor is energized and the pilot valve opens
igniting the pilot flame.

The flame rod senses a flame and de-energizes the ignitor
opening the main gas valve and the main burners light.

30 seconds after the main burners light the circulating fan is
energized at the heating speed.

When the thermostat is satisfied, terminal W is de-energized,
de-energizing the ignition system closing the gas valve.

After a 5 second postpurge timing period, the combustion air
blower is de-energized and the heat fan off timing begins.

When this field selected heat fan off timing is completed the
circulating fan is de-energized.

If the primary, rollout and auxiliary limit switches open, the
thermostat and ignition system is de-energized and the gas
valve closes. The combustion blower and the circulating fan,
at heat speed, are energized.

The combustion blower remains energized for the 5 second
postpurge timing period if the primary, rollout and auxiliary
limit switches remake the contact (the rollout and auxiliary
limit switches must be manually reset). The circulating fan
remains energized for the selected heat delay off timing.

Normal operation of the system resumes.

COOLING

When the thermostat calls for COOL, the thermostat termi-
nals G and Y are energized signaling the compressor and
outdoor fan to run.

After a cool fan on delay timing of 2 seconds, the circulating
fan is energized at cooling speed.

When the thermostat is satisfied, terminals G and Y are de-
energized, de-energizing the compressor and outdoor fan.

After a cool fan off delay timing of 30 seconds the circulating
fan is de-energized.

CIRCULATING FAN

When the thermostat calls for FAN, the thermostat terminal G
is energized signaling the circulating fan to run at the heat
speed 2 seconds after the G terminal is energized.

If a call for HEAT occurs, the circulating fan continues to run
at the heat speed.

If a call for COOL occurs, the circulating fan switches to cool
speed after a 4 second delay.

When the thermostat ends the call for FAN, the thermostat
terminal G is de-energized, de-energizing the circulating fan.

START-UP

PRE-START CHECK LIST

Complete the following checks before starting the unit.

1.

Check the type of gas being supplied. Be sure that it is 
the same as listed on the unit nameplate.

2.

Make sure that the vent outlet air hoods has been prop-
erly installed.

OPERATING INSTRUCTIONS

1.

STOP! Read the information on the unit safety label.

2.

Set the thermostat to the OFF position.

3.

Turn off all electrical power to the unit.

4.

DO NOT try to light the burners by hand. This appliance 
is equipped with an ignition device which automatically 
lights the burners. 

5.

Remove the access panel.

6.

Turn the gas valve switch to the OFF position.

7.

Wait five (5) minutes to clear out any gas. If you then 
smell gas, STOP! Follow B in the information on the unit 
safety label. If you don't smell gas, go to the next step.

8.

Turn the gas valve switch to the ON position.

9.

Replace the control access panel.

10. Turn on all electric power to the unit.

11. Set the thermostat to the desired setting.

12. If the unit will not operate, follow the instructions To Turn 

Off Gas To Appliance and call your service technician or 
gas supplier.

TO TURN OFF GAS TO UNIT

1.

Set the thermostat to the OFF position.

2.

Turn off all electric power to the appliance if service is to 
be performed.

Summary of Contents for DNH018

Page 1: ...ION and WARNING Notes are intended to clarify or make the installation easier Cautions are given to prevent equipment damage Warnings are given to alert installer that personal injury and or equipment...

Page 2: ...T 13 8 UNIT DIMENSIONS FRONT BOTTOM 14 9 UNIT DIMENSIONS BACK BOTTOM 14 10 GAS VALVE FRONT 16 11 GAS VALVE REAR 16 12 PROPER FLAME ADJUSTMENT 17 13 IGNITOR AND FLAME SENSOR ASSEMBLY 17 14 D1NH COIL DE...

Page 3: ...is evident the extent of the damage should be noted on the carrier s freight bill A separate request for inspection by the carrier s agent should be made in writing Refer to Form 50 15 NM for addition...

Page 4: ...1 N H 0 3 6 0 2 4 0 6 P R O D U C T C A T E G O R Y D S i n g l e P a c k a g e A i r C o n d i t i o n e r P R O D U C T G E N E R A T I O N 1 1 s t G e n e r a t i o n P R O D U C T I D E N T I F I...

Page 5: ...Seal duct covers with silicone caulk Duct work should be designed and sized according to the methods of the Air Conditioning Contractors of America ACCA as set forth in their Manual D A closed return...

Page 6: ...access panels and min imum clearances THERMOSTAT The room thermostat should be located on an inside wall approximately 56 above the floor where it will not be subject to drafts sun exposure or heat f...

Page 7: ...R ALL MODELS 24 VOLT TRANSFORMER FIGURE 4 POWER WIRING FIELD DIAGRAM G R O U N D L U G R E F E R T O E L E C T R I C A L D A T A T A B L E S T O S I Z E T H E D I S C O N N E C T F I E L D S U P P L I...

Page 8: ...2 2 1 2 3 TON 45 36 42 2 25 55 2 2 1 2 TON 70 56 65 3 30 60 3 TON 70 56 65 3 25 55 3 1 2 TON 4 5 TON 80 64 74 3 25 55 3 TON 90 72 84 4 30 60 3 1 2 TON 108 87 100 4 45 75 4 5 TON 108 87 43 4 30 60 4 5...

Page 9: ...int union must be installed in the gas piping 2 When required by local codes a manual shut off valve may have to be installed outside of the unit 3 Use wrought iron or steel pipe for all gas lines Pip...

Page 10: ...housands of BTU per hour based upon a pressure drop of 0 5 inch water column LENGTH IN FEET NOMINAL INCHES IRON PIPE SIZE 1 2 3 4 1 1 1 4 10 275 567 1 071 2 205 20 189 393 732 1 496 30 152 315 590 1 2...

Page 11: ...be isolated from the gas supply piping sys tem by closing its individual manual shut off valve during any pressure testing of the gas supply piping system at test pres sures equal to or less than 1 2...

Page 12: ...A SUPPLY AIR BLOWER MOTOR FLA MINIMUM CIRCUIT AMPACITY MAX FUSE SIZE AMPS2 MAX HACR BREAKER SIZE AMPS UNIT POWER FACTOR TRANSFORMER SIZE VA MIN MAX RLA LRA 018 208 230 1 60 187 253 7 1 48 1 1 2 6 12 5...

Page 13: ...VERALL All dimensions are in inches They are subject to change with out notice Certified dimensions will be provided upon request TABLE 9 UNIT DIMENSIONS FRONT UNIT SIZE DIMENSION A B 018 036 33 1 2 1...

Page 14: ...Y 1 5 8 D I A K N O C K O U T 1 2 N P T I C O N N E C T I O N L O W V O L T A G E C O N N 1 8 D I A K N O C K O U T FIGURE 9 UNIT DIMENSIONS BACK BOTTOM 1 3 4 1 5 2 9 9 1 6 1 5 3 1 2 1 3 4 1 3 4 1 5 4...

Page 15: ...zed at cooling speed When the thermostat is satisfied terminals G and Y are de energized de energizing the compressor and outdoor fan After a cool fan off delay timing of 30 seconds the circulating fa...

Page 16: ...screw on the automatic gas valve Refer to Figure 6 Adjust as follows 1 Remove the cap from the valve body See Figure 6 for location 2 To decrease the gas pressure turn the adjusting screw countercloc...

Page 17: ...n on the rating plate and the data in Tables 3 and 4 After the temperature rise has been determined the CFM can be calculated as follows After about 20 minutes of operation determine the furnace tempe...

Page 18: ...urface or other parts in the air circuit Cleaning should be as often as necessary to keep the coil clean Use a brush vac uum cleaner attachment or other suitable means If water is used to clean the co...

Page 19: ...f the restrictor plate to the tube sheet 5 If soot build up is particularly bad remove the vent motor and clean the wheel and housing 6 After brushing is complete blow all brushed areas with air or ni...

Page 20: ...TABLE FOR D1NH018 OUTDOOR TEMP F SUPERHEAT AT COMPRESSOR SUCTION F AIRFLOW 600 CFM INDOOR WB TEMP F 55 57 59 61 63 65 67 69 71 73 75 65 30 7 31 2 31 8 32 3 32 9 33 4 34 0 34 2 34 4 34 7 34 9 70 22 9 2...

Page 21: ...34 9 35 6 36 3 75 15 1 18 0 20 8 23 6 26 5 29 3 32 1 33 0 33 9 34 7 35 6 80 10 8 14 1 17 4 20 8 24 1 27 5 30 8 31 8 32 9 33 9 34 9 85 6 4 10 3 14 1 18 0 21 8 25 7 29 5 30 7 31 9 33 0 34 2 90 6 3 10 2...

Page 22: ...23 8 25 1 26 5 27 8 29 1 30 5 31 8 32 8 3 7 34 7 35 7 70 22 4 23 4 24 4 25 3 26 3 27 3 28 2 29 7 31 1 32 5 33 9 75 21 1 21 7 22 3 22 9 23 5 24 1 24 7 26 6 28 5 30 3 32 2 80 19 7 20 0 20 2 20 4 20 6 20...

Page 23: ...eme care when working with the live circuits Check the unit nameplate for the correct line voltage and set the volt meter to the correct range before making any connections with line terminals If the...

Page 24: ...66324 YIM B 1004 24 Unitary Products Group FIGURE 16 TYPICAL WIRING DIAGRAM D1NH 018 024 030 036 048 208 230 1 60 POWER SUPPLY...

Page 25: ...66324 YIM B 1004 Unitary Products Group 25 FIGURE 17 TYPICAL WIRING DIAGRAM D1NH 030 036 042 048 208 230 3 60 POWER SUPPLY...

Page 26: ...66324 YIM B 1004 26 Unitary Products Group FIGURE 18 TYPICAL WIRING DIAGRAM D1NH 030 036 042 048 460 3 60 POWER SUPPLY...

Page 27: ...66324 YIM B 1004 Unitary Products Group 27 FIGURE 19 TYPICAL WIRING DIAGRAM D1NH 036 042 048 060 575 3 60 POWER SUPPLY...

Page 28: ...66324 YIM B 1004 28 Unitary Products Group FIGURE 20 TYPICAL WIRING DIAGRAM D1NH 060 208 230 1 60 POWER SUPPLY...

Page 29: ...66324 YIM B 1004 Unitary Products Group 29 FIGURE 21 TYPICAL WIRING DIAGRAM D1NH 060 208 230 3 60 POWER SUPPLY...

Page 30: ...66324 YIM B 1004 30 Unitary Products Group FIGURE 22 TYPICAL WIRING DIAGRAM D1NH 060 460 3 60 POWER SUPPLY...

Page 31: ...in heating and to obtain approximately 400 CFM Ton in cooling 6 If both LR and ASCT are present wire 801 BL and 805 BL are connected to ASCT 3 if LR only is present wire 801 BL and 805 BL are connecte...

Page 32: ...ge without notice Printed in U S A 66324 YIM B 1004 Copyright 2004 by Unitary Products Group All rights reserved Supersedes 66324 YIM A 1003 035 18266 002 A 1003 Unitary 5005 Norman Product York OK Gr...

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