Johnson Controls Unitary Products DHQ024 Installation Manual

R-410A
DHQ024-060
2-5 Ton
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 10
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Unit Accessory Weights . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Unit Dimensions Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 DHQ024-060 Two Stage Gas Heat . . . . . . . . . . . . . . . . 12
8 Natural Gas Pipe Sizing Chart . . . . . . . . . . . . . . . . . . . . 14
9 Propane (LP) Gas Pipe Sizing Chart . . . . . . . . . . . . . . . 14
10 Natural Gas Application Data-Two Stage . . . . . . . . . . . . 15
11 Propane (LP) Gas Application Data-Two Stage . . . . . . . 15
12 DHQ024-060 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
13 DHQ024-060 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1 Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Dimensions Front and Bottom . . . . . . . . . . . . . . . . . . . . . 8
5 Dimensions Back and Bottom . . . . . . . . . . . . . . . . . . . . . 8
6 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Typical Field Control Wiring Diagram For Dual Fuel Heat
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

General

Unitary Products Model DHQ units are dual fuel heat pump
units designed for outdoor installation. Only gas piping, electric
power and duct connections are required at the point of
installation.
The two stage gas-fired heaters have spark to pilot ignition. The
tubular heat exchangers are aluminized steel.
The refrigerant system is fully charged with R-410A Refrigerant,
and is tested and factory sealed.

TABLE OF CONTENTS

Flue Vent Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bottom Duct Application . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Side Duct Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Blower Speed Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Adjustment of Temperature Rise . . . . . . . . . . . . . . . . . . . 30
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Start-Up Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
LIST OF TABLES
14 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 22
15 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 23
16 Delay Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
17 Dual Fuel Package Unit Operating Chart . . . . . . . . . . . . 27
18 Ignition Control Board Flash Codes . . . . . . . . . . . . . . . . 28
19 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 31
20 DHQ24 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . . 34
21 DHQ030 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . 34
22 DHQ036 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . 35
23 DHQ42 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . . 35
24 DHQ48 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . . 36
25 DHQ060 Charging Table . . . . . . . . . . . . . . . . . . . . . . . . 36
LIST OF FIGURES
8 Typical Field Power Wiring Diagram . . . . . . . . . . . . . . . 11
9 External Supply Connection External Shut-Off . . . . . . . 13
10 Flue Vent Outlet Air Hood . . . . . . . . . . . . . . . . . . . . . . . 14
11 Control Board Speed Tap Location . . . . . . . . . . . . . . . . 23
12 Two Stage Gas Valve Front . . . . . . . . . . . . . . . . . . . . . . 30
13 Two Stage Gas Valve Rear . . . . . . . . . . . . . . . . . . . . . . 30
14 Proper Flame Adjustment . . . . . . . . . . . . . . . . . . . . . . . 30
15 R-410A Quick Reference Guide . . . . . . . . . . . . . . . . . . 39
Safety Considerations
This is a safety alert symbol
labels or in manuals, be alert to the potential for personal injury.
Understand and pay particular attention the signal words
DANGER, WARNING or CAUTION.
DANGER indicates an imminently hazardous situation, which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation, which,
if not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation, which, if
not avoided may result in minor or moderate injury. It is also
used to alert against unsafe practices and hazards involving
only property damage.
Management System
. When you see this symbol on
1101790-UIM-C-0414
SO 9001
Certified Quality