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9

NOTE:

 A weather-tight disconnect switch, properly sized for the 

unit total load, must be field or factory installed.  An external field 

supplied disconnect may be mounted on the exterior panel.

Ensure the data plate is not covered by the field-supplied disconnect 

switch.

•  Some disconnect switches are not fused.  Protect the power 

leads at the point of distribution in accordance with the 

unit data plate.

•  The unit must be electrically grounded in accordance with 

local codes or, in the absence of local codes, with the latest 

edition of the National Electrical Code (ANSI-NFPA 70).  A 

ground lug is provided for this purpose.  Size grounding 

conductor in accordance with Table 250-95 of the National 

Electrical Code.  Do not use the ground lug for connecting 

a neutral conductor.

•  Connect power wiring to the electrical middle contactor 

within the main control box of power block, if equipped.

Low Voltage

Terminal Strip

Thermostat wiring

for all units

connect to low

voltage strip

Ground

Lug

Line voltage connects

to power block on

Coolers, 230V Gas 

Packs, and 2 Speed

Models.

Line voltage connects

to middle contactor

on 460v and 575v

Gas Packs

(or power block

if equipped)

Power Block -

(Coolers, 230V Gas 

Packs, and 2 Speed

Models)

Field wiring enters

from this direction

POWER AND LOW VOLTAGE BLOCK LOCATIONS

R

co

ntrol 

wiring

th

ro

ugh

gromme

t

co

ntrol 

wiring

Field

fo

r

lin

ev oltage

Gr

ound Lug

Field wiring

ente

rs

 f

ro

m

LOW

HIGH

 25 TONS MODEL POWER AND LOW VOLTAGE BLOCK LOCATIONS

NOTE: 

 Depending on the options installed, the location of the components 

may vary in some models.

F

AILURE

 

OF

 

UNIT

 

DUE

 

TO

 

OPERATION

 

ON

 

IMPROPER

 

LINE

 

VOLTAGE

 

OR

 

WITH

 

EXCESSIVE

 

PHASE

 

UNBALANCE

 

CONSTITUTES

 

PRODUCT

 

ABUSE

 

AND

 

IS

 

NOT

 

COVERED

 

BY

 

THE

 

WARRANTY

.  I

T

 

MAY

 

CAUSE

 

SEVERE

 

DAMAGE

 

TO

 

THE

 

UNIT

 

ELECTRICAL

 

COMPONENTS

.

WARNING

Areas Without Convenience Outlet

It is recommended that an independent 115V power source be 

brought to the vicinity of the roof top unit for portable lights and 

tools used by the service mechanic.

NOTE:

 Refer to local codes for requirements.  These outlets can 

also be factory installed.

Units installed on Roof Tops

Main power and low voltage wiring may enter the unit through 

the side or through the roof curb. Install conduit connectors at the 

desired entrance locations.  External connectors must be weath-

erproof.  All holes in the unit base must be sealed (including those 

around conduit nuts) to prevent water leakage into building.  All 

required conduit and fittings are to be field supplied.
Supply voltage to roof top unit must not vary by more than 10% of 

the value indicated on the unit data plate.  Phase voltage unbal-

ance must not exceed 2%.  Contact your local power company for 

correction of improper voltage or phase unbalance.

Summary of Contents for DBG Series

Page 1: ...ndex Replacement Parts 2 Safety Instructions 2 General Information 3 Unit Location 4 Clearances 6 Roof Curb Post Installation Checks 6 Roof Top Duct Connections 6 Rigging Details 6 Electrical Wiring 8...

Page 2: ...ATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF TURN OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE FURNACE BEFORE TURNING OFF THE ELECTRICAL SUPPLY WARNING SHEET METAL PARTS SCREWS CLIPS AND SIMILAR...

Page 3: ...National Codes It is the installer s responsibility to install the product in accordance with National Codes and or prevailing local codes and regulations The heating and cooling capacities of the un...

Page 4: ...t in an area where the outdoor air i e combustionairfortheunit willbefrequentlycontaminated by compounds containing chlorine or fluorine Common sources of such compounds include swimming pool chemical...

Page 5: ...ove wooden struts and shipping brace per installation instructions The struts are located in the fork holes and are used to protect the unit from damage while lifting with forks The shipping brace is...

Page 6: ...ance around the unit should be kept for safety service maintenance and proper unit operation A clearance of 75 on the service side of the unit is recommended to facilitate possible blower assembly sha...

Page 7: ...contact with the unit during transport Remove wood strutsmountedbeneathunitbaseframebeforesettingunit on roof curb These struts are intended to protect unit baseframefromforkliftdamage Removalisaccomp...

Page 8: ...HE WIRING PROTECT WIRING FROM SHARP EDGES FOLLOW NATIONAL ELECTRICAL CODE AND ALL LOCAL CODES AND ORDINANCES DO NOT ROUTE WIRES THROUGH REMOVABLE ACCESS PANELS CAUTION CONDUIT AND FITTINGS MUST BE WEA...

Page 9: ...AND LOW VOLTAGE BLOCK LOCATIONS R control wiring through grommet control wiring Field for linev oltage Ground Lug Field wiring enters from LOW HIGH 25 TONS MODEL POWER AND LOW VOLTAGE BLOCK LOCATIONS...

Page 10: ...RNING IMPORTANT NOTE This unit is factory set to operate on natural gas at the altitudes shown on the rating plate TO PREVENT PROPERTY DAMAGE PERSONAL INJURY OR DEATH WHEN EITHER USING PROPANE GAS ALO...

Page 11: ...to the gas valve to keep it from turning 6 Install a manual shut off valve in a convenient location within six feet of unit between the meter and the unit 7 Tighten all joints securely 8 The unit must...

Page 12: ...high fire and within 6 7 7 3 inches w c low fire at the manifold with all gas appliances in operation Maintaining proper gas pressure depends on three main factors 1 Vaporization rate which depends on...

Page 13: ...3 8 W C WARNING THIS UNIT MUST BE ISOLATED FROM THE GAS SUPPLY PIPING SYSTEM BY CLOSING ITS INDIVIDUAL MANUAL SHUTOFF VALVE DURING ANY PRESSURE TESTING EQUAL TO OR LESS THAN 1 2 PSIG CAUTION 7 There m...

Page 14: ...Responsibility The installing contractor must be certain that All supply and return air ductwork is in place properly sealed and corresponds with installation instructions All thermostats are mounted...

Page 15: ...or nameplate amps are not exceeded A final check of amp draw should be made upon completion of air balancing of the duct system see Appendix B Set Evaporator Fan Rpm Actual RPM s must be set and verif...

Page 16: ...n device which automatically lights the main burner DO NOT try to light burner by any other method 6 Move the gas control valve switch to the OFF position Do not force 7 Wait five minutes to clear out...

Page 17: ...he dripleg and installing a predrilled cap with a hose fitting With Power And Gas On 2 Put unit into heating cycle and turn on all other gas consuming appliances NATURAL Min 5 0 W C Max 10 0 W C PROPA...

Page 18: ...Using a leak detection solution or soap suds check for leaks at pressure boss screw Bubbles forming indicate a leak SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY TO PREVENT UNRELIABLE OPERATION OR EQUIPM...

Page 19: ...lose manual gas shut off valve external to the unit 6 Replace the heat exchanger door on the unit 7 If cooling and or air circulation will be desired turn ON the electrical power Automatic Reset High...

Page 20: ...igeration Sequence Check With the disconnect switch open remove the field connected ther mostat wire from terminal R on TB1 terminal block Place a jumper across terminals R and G and across R and Y on...

Page 21: ...e maintenance is the best way to avoid unnecessary expense and inconvenience Have this system inspected at regu lar intervals by qualified service personnel at least twice a year Routine maintenance s...

Page 22: ...Y ADJUSTMENT CONTACT A QUALIFIED SERVICER AT ONCE IF AN ABNORMAL FLAME SHOULD DEVELOP WARNING At least once a year prior to or during the heating season make a visual check of the burner flames NOTE T...

Page 23: ...ains on The diagnostic fault code is two flashes Pressure Switch Stuck Closed 3 FLASH CODE A stuck closed pressure switch can be caused by a faulty pressure switch or faulty wiring If the control enco...

Page 24: ...BHP 0 2 9359 4 92 8991 3 79 8621 3 54 8188 3 27 7826 3 04 0 4 9018 3 18 8632 4 39 8251 3 39 7867 3 15 7363 2 85 6992 2 63 0 6 8279 2 96 7879 3 86 7484 2 99 7085 2 75 0 8 7957 4 82 7513 2 73 7097 3 35...

Page 25: ...6 8250 6 12 7657 5 40 7033 4 74 1 2 8934 7 89 8550 7 25 8175 6 57 7598 5 72 7043 5 04 6394 4 38 1 4 8424 7 49 8071 6 91 7639 6 21 7041 5 38 6318 4 63 1 6 7959 7 21 7609 6 57 7088 5 84 6295 4 97 1 8 74...

Page 26: ...RE DROP SCFM 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 In WG 0 15 0 18 0 22 0 27 0 32 0 37 0 42 0 48 0 55 0 61 0 69 0 76 Airflow Pressure Drop of Downflow Economizer for 15 to 25 To...

Page 27: ...lt Drive 7 50 7 5 DCG1807V 575 3 60 9 0 78 0 9 0 78 0 3 0 33 0 7 Model Number Electrical Rating Compressor Circuit 1 Compressor Circuit 2 Outdoor Fan Motor Indoor Fan Motor Optional Powered Convienien...

Page 28: ...DIMENSIONS VERTICAL DISCHARGE TOP VIEW 21 60 7 48 22 B C D A Model A B C D 15 Ton 20 Ton 133 1 2 88 7 32 50 9 32 5 5 32 25 Ton 133 1 2 88 7 32 53 9 32 5 5 32 NOTE 15 20 ton models have 3 fans 25 ton...

Page 29: ...29 APPENDIX D WIRING DIAGRAMS...

Page 30: ...ED CB2 L2 T3 L1 T2 L3 T1 HIGH SPEED CB1 L2 T3 L1 T2 L3 T1 OR RD BK GY BL YL YL BL GY BK RD OR L3 T3 L2 CC1 L1 T1 T2 L3 T3 L2 CC2 L1 T1 T2 L3 T3 L2 BC1 L1 T1 T2 L3 T3 L2 BC2 L1 T1 T2 T3 T2 T1 COMP 1 RD...

Page 31: ...S ONLY USE NEC CLASS 2 WIRE 4 3 L1 AND L2 ON IIC CONTROL IS 24V INPUT 0140L03767 A COMPONENT LEGEND T1 TERMINAL BLOCK L1 TB2 2 FROM TERMINAL 3 TO TERMINAL 2 ON THE TRANSFORMER 6 FOR 208V OPERATION MOV...

Page 32: ...L3 T1 HIGH SPEED CB1 L2 T3 L1 T2 L3 T1 OR RD BK GY BL YL YL BL GY BK RD OR L3 T3 L2 CC1 L1 T1 T2 L3 T3 L2 CC2 L1 T1 T2 L3 T3 L2 BC1 L1 T1 T2 L3 T3 L2 BC2 L1 T1 T2 T3 T2 T1 COMP 1 RD YL BK CCH1 T3 T2...

Page 33: ...33 Wiring is subject to change Always refer to the wiring diagram on the unit for the most up to date wiring DBG180 DBG240 460 575 3 60 2 SPEED WIRING DIAGRAMS...

Page 34: ...RE SWITCH MAIN LIMIT OPEN BAD SWITCH STICKING GAS VALVE 3 MIN COMP ANTI CYCLE TIMER L2 L3 L1 L2 L3 L1 IIC DIAGNOSTIC BLINK CODES L1 L2 L3 LINE VOLTAGE YL RD BK PU OR 7 7 SEE ACCESSORY KIT LITERATURE F...

Page 35: ...FOR OPTIONAL CONVENIENCE OUTLET WIRING DIAGRAM POWER DIAGRAM F L P M L P PLM PLF BK RD PU L1 L2 L3 T1 T2 T3 LAC MC YL BK BR BK BR YL T3 T2 T1 BR L1 L2 L3 T1 T2 T3 EM GY BL YL RD BL BK OR RD YL BK OR...

Page 36: ...VOLTAGE TERMINAL BLOCK 4 TERMINALS FOR 24VAC PWR RD BK BR WIRE AND 6 TERMINALS FOR 24VAC COM BL WIRE 4 CONNECTIONS SHOWN ARE FOR 1 STAGE HEAT OPERATION WHEN 2 STAGE OPERATION IS REQUIRED REMOVE WH JU...

Page 37: ...necessary Check unit wiring to ensure it is not in contact with refrigerant piping or sharp metal edges Tighten as needed Verify that the crankcase heaters have been energized for 24 hours 9 2014 Date...

Page 38: ...2 Compressor Amps Blower Amps Condenser Fan Amps ELECTRICAL Total External Static Pressure Blower Wheel RPM TEMPERATURES Outdoor Air Temperature Return Air Temperature Cooling Supply Air Temperature...

Page 39: ...39 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 40: ...products may mean a change in specifications without notice 2019 CUSTOMER FEEDBACK Daikin is very interested in all product comments Please fill out the feedback form on the following link https daiki...

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