Fisher & Paykel DCS DRH-48N User manual

INSTALLATION GUIDE / USER GUIDE
US CA
28042E 10.19
PROFESSIONAL
BUILT-IN PATIO HEATER
DRH-48N model

1
CONTENTS
IMPORTANT!
SAVE THESE INSTRUCTIONS
The models shown in this user guide may not be available in all markets and are subject to change
at any time. For current details about model and specification availability in your country, visit our
website listed on the back cover or contact your DCS by Fisher & Paykel dealer.
Safety and warnings 2
Introduction 4
Locating heater for use 5
Clearance specifications 6
Converting heater for different altitudes 11
Installation 13
Mounting 14
Electrical 14
Gas piping 15
Ventilation 16
Leak test 16
Lighting instructions 17
Wiring/schematic diagrams 18
Registration and customer care 19

2
SAFETY AND WARNINGS
WARNING!
To reduce the risk of fire, electrical shock, injury to persons or damage when using the
heater, we recommend you follow the important safety guidance below. Read this user
guide carefully and completely before using your heater to reduce the risk of fire, burn
hazard or other injury.
IF YOU SMELL GAS:
1 Shut off gas to the appliance.
2 Extinguish any open flames.
3 If odor continues, immediately call your gas supplier
or your fire department.
zDo not try lighting this appliance without reading the “Lighting Instructions” section
of this manual.
zImproper installation, adjustment, alteration, service or maintenance can cause property
damage, injury or death.
zRead the installation, operating and maintenance instructions thoroughly before use,
installing or servicing this equipment.
zThis outdoor gas appliance is not intended to be installed in residential dwellings or on
recreational vehicles, boats or in a non-ventilated room.
zDo not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance. An LP cylinder not connected for use shall not be stored in
the vicinity of this or any other appliance.
zDo not repair or replace any part of the heater unless specifically recommended in this
manual. All other service should be referred to a qualified technician.
zDo not use in an explosive atmosphere. Keep heater away from areas where gasoline or
other flammable liquids or vapors are stored or used.
zBefore each use check for damaged parts such as hoses or burner.
zDo not attempt to alter unit in any manner.
zIt is imperative that the control compartment, burners, and circulation air passageways
of the heater must be kept clean. The heater should be inspected before each use, and
at least annually by a qualified service person, for the presence of spiders, webs or
other insects. The burner area is a common and desired spider haven.
zSpiders and insects can nest in the burner of this and any other heater. Spider webs
can present a dangerous condition which can damage the heater and render it unsafe
for use. Excessive or abnormal noises may be an indication of blockage by dirt, debris,
spider webs, etc. Cleaning should be referred to a qualified technician.
zChildren should not be left alone or unattended in an area where the heater is being
used. Never allow them to sit, stand or play on or around the heater at any time. When
in use, portions of the heater get hot enough to cause severe burns.
zNever let clothing, or other flammable materials come in contact with or too close to
any part of heater or hot surface until it has cooled. Fabric may ignite and result in
personal injury.

3
SAFETY AND WARNINGS
zBegin by insuring proper installation and servicing. Follow the installation instructions
provided with this product. Have your heater installed by a qualified technician. Have
the installer show you where the gas supply shut off valve is located so that you know
where to shut off the gas to the heater. If you smell gas, your installer has not done
a proper job of checking for leaks. If the connections are not perfectly seated and
tightened, you can have a small leak and therefore a faint gas smell. Finding a leak
is not a “do-it-yourself” procedure. Some leaks can only be found with the heater
in operation mode and for your protection it must be done by a qualified service
technician. Never use an open flame to locate leak.
zClean the heater with caution. Avoid steam burns; do not use a wet sponge or cloth to
clean the heater while it is hot. Some cleaners produce noxious fumes or can ignite if
applied to a hot surface.
zBe sure all heater controls are turned off and the heater is cool before using any type
of aerosol cleaner on or around the heater. The chemical that produces the spraying
action could, in the presence of heat, ignite or cause metal parts to corrode.
zDo not operate the heater under unprotected combustible construction, maintain
clearances. Use only in well
ventilated areas.
zKeep the area surrounding the heater free from combustible materials, trash, or
combustible fluids and vapors such as gasoline or charcoal lighter fluid. Do not obstruct
the flow of combustion and ventilation air.
zTo avoid the risk of burns or accidental cloth ignition, do not touch the heater anywhere
near the burner
assembly during operation.
zDo not touch the burner assembly until after the heater has cooled.
zCarefully monitor young children in the vicinity of any operating heater. Do not hang
clothing or any other flammable materials from, on, or near the heater.
zAll leak tests should be done with a soap solution. Matches should never be used
for this purpose.
zThis outdoor heater is primarily used for temporary heating of outdoor patios, decks,
spa and pool area, and work areas. Turn heater off when leaving the area. Do not allow
heater to operate unattended.
zIf the heater is used in locations where storage of combustible materials is allowed, a
sign must be posted in a conspicuous location specifying the maximum stacking height
in order to maintain the required clearance to combustible materials.
zrecommendations on hook-up to gas supply:
zA manual valve must be installed external to the appliance, in an accessible location
from the front for the purpose of shutting off the gas supply. The supply line must not
protrude beyond the back of the unit. Make sure the gas supply is turned off at the wall
valve before connecting the appliance.
zThe gas supply connections should be made by a qualified technician and in
accordance with local codes or ordinances. In the absence of a local code, the
installation must conform to the National Fuel Gas Code ANSI Z223.1.
zNOTE: This product must be installed by a licensed plumber or gas fitter when installed
within the Commonwealth of Massachusetts.

4
INTRODUCTION
Thank you for selecting this DCS Professional Built-in Patio Heater. Because of this
appliance’s unique features we have developed this use and care and installation guide. It
contains valuable information on how to properly operate and maintain your new appliance
for years of safe and enjoyable use.
For your convenience, product questions can be answered by a DCS Customer Care
Representative, email: [e-mail]

5
LOCATING HEATER FOR USE
For outdoor installation only.
Not for use in residential dwellings.
This outdoor heater is used primarily for temporary heating of outdoor patios, decks, spa
and pool area, and work areas. This heater is not intended for indoor use in a residential
dwelling or in an enclosed area. Always ensure that adequate fresh air ventilation
is provided.
WARNING!
zNever operate in an explosive atmosphere. Keep away from areas where gasoline or
other flammable liquids or vapors are stored or used.
zIf a non-combustible material such as stucco is covering a combustible material such as
wood, the minimum clearance distance needs to be held to the wood. The presence of
a non-combustible material inside the clearance zone does not eliminate the minimum
clearance zone to combustible material.
zThe Built-in Heater is designed to function in an open area. Recommended minimum
clearances should be maintained to all surfaces (combustible and non-combustible)
for optimum performance. Non-combustible material within the minimum clearance
area could result in discoloration or deterioration. Do not place heater under a tarp or
canvas cover. Adequate space must be provided around the heater to assure a source of
fresh air for combustion and to allow exhaust gases to dissipate. Proper clearances will
safeguard against potential damage to the unit and maintain good heater performance.
Never install the heater into a ceiling recess or inside a soffit.
Definition of non-combustible material
Material which is not capable of being ignited and burned, such as materials consisting
entirely of, or a combination of, steel, iron, brick tile, concrete, slate, and plaster.
Definition of combustible material
Any materials of a building structure or decorative structure made of wood, compressed
paper, plant fibers or other materials that are capable of transferring heat or being ignited
and burned. Such material shall be considered combustible even though they may be flame-
proofed, fire-retardant treated, or painted surface or plastered.

6
CLEARANCE SPECIFICATIONS
Make sure the heater is level.
Note: The stated clearance to combustibles represents a surface temperature of 90°F
(32°C) above room temperature. Building materials with a low heat tolerance (such
as plastics, vinyl siding, canvas, tri-ply, etc.) may be subject to degradation at lower
temperatures. It is the installer’s responsibility to assure that adjacent materials are
protected from degradation. Stainless steel hardware is highly recommended. Bolts in the
wall should be secured to the wall studs/structure. Weight of the heater is 50 lbs.
0° and 45° Installation
Minimum clearances to combustible and non-combustible material:
FRONT
Heater mounting
body assembly
min 18" min 18"48"
min 96"
Non-combustible surface* (required)
Combustible surface
Flooring
Non-combustible surface*
or combustible surface

7
CLEARANCE SPECIFICATIONS
0° Installation
Minimum clearances to combustible material:
PROFILE
10 1/4"
7 3/4"
min 96"
min 120"
min 16"
min 21"
1/2"
conduit* gas
pipe*
drip leg
with
1/8" NPT
plugged
test gage
connection
utilize 2 bolts
(min) per bracket
utilize 2 bolts
(min) per bracket
gas
shut-off
valve*
*Installer supplied.
4 bolts*
(two on
each side)
Non-combustible surface* (required)
Combustible Surface
Flooring
Non-combustible surface*
or combustible surface

8
CLEARANCE SPECIFICATIONS
45° Installation
Minimum clearances to combustible material:
*Installer supplied.
max 45°
min 130"
min 12" refmin 96" min 25"
min 18"
1/2"
conduit*
gas
pipe*
drip leg with 1/8"
NPT plugged test
gage connection
gas
shut-off
valve*
wall
(combustible
surface)
utilize 2 bolts
(min) per bracket
2 bolts (min)
per bracket
4 bolts*
(two on
each side)
PROFILE
Non-combustible surface* (required)
Combustible Surface
Flooring
Non-combustible surface*
or combustible surface

9
CLEARANCE SPECIFICATIONS
0° Installation
Minimum clearances to non-combustible material:
min 96"
min 18"
1/2"
conduit*
gas
pipe*
drip leg with 1/8"
NPT plugged test
gage connection
gas
shut-off
valve*
2 bolts
(min) per
bracket
4 bolts*
per bracket
*Installer supplied.
PROFILE
Non-combustible surface* (required)
Combustible Surface
Flooring
Non-combustible surface*
or combustible surface

10
CLEARANCE SPECIFICATIONS
45° Installation
Minimum clearances to non-combustible material:
min 96"
min 18"
1/2"
conduit*
gas
pipe
drip leg with 1/8"
NPT plugged test
gage connection
gas shut-
off valve
wall
(non-combustible
surface)
utilize 2 bolts (min)
per bracket
4 bolts*
per bracket
*Installer supplied.
PROFILE
Non-combustible surface* (required)
Combustible Surface
Flooring
Non-combustible surface*
or combustible surface
max 45°

11
CONVERTING HEATER FOR DIFFERENT ALTITUDES
This heater is shipped from the factory equipped with a #30 dms orifice for use at altitudes
from 0 to 2000 ft. To convert the heater for operation at altitudes between 2000 and
4500 ft., use the conversion kit part number 536673 available from:
Fisher & Paykel Customer Care
24 hours, 7 days a week
Office address
Fisher & Paykel Appliances Inc.
695 Town Center Drive Suite 180
Costa Mesa, CA 92626
USA
The conversion to a high altitude operation shall be carried out by a manufacture’s
authorized representative, in accordance with the requirements of the manufacturer,
provincial or territorial authorities having jurisdiction and in accordance with the
requirements of the CSA B149.1 or CSA B149.2 installation codes.
USA
For installation at elevations above 2000 ft (610 m), the appliance shall be de-rated
4 percent for each 1000 ft (305 m) of elevation above sea level.
Canada
Appliances are certified for altitudes of 2000 to 4500 ft. (610 – 1370 m) or 0 to 4500 ft.
(0 – 1370 m). High-altitude rating may be obtained by a change in manifold pressure in
accordance with Standard for Gas Appliances for Use at High Altitudes, CSA 2.17.
24/7

12
CONVERTING HEATER FOR DIFFERENT ALTITUDES
Converting the heater to operate at altitudes between 2000–4500 ft (610–1370 m)
Before commencing the conversion, ensure that the heater is isolated from the gas and
electrical supply.
WARNING!
zWhen installing Mounting Body Assembly,
make sure left hand and right hand Body
Assembly are level. If not, escaping
heat could easily cause damage to the
components inside the compartment.
zWhen installing heater in the inverted
orientation, please contact Customer Care.
For special instructions, see part 242420.
Inverted installation to be performed by a
qualified technician.
Remove four screws from the front
service panel. Locate the factory fitted #30
orifice, in the orifice fitting, at the outlet
from the gas valve assembly.
1
Using a 7/16 AF spanner, remove the #30
orifice by rotating in an anti-clockwise
direction and replace with the #31
orifice provided.
2
Normal orientation
Inverted orientation

13
INSTALLATION
The Built-in Patio Heater provides radiant warmth indoors (commercial applications only,
not for use in residential dwellings) or outdoors with a powerful 56,000 Btu/hr natural gas.
All units are equipped with hot surface ignition and 100% shut-off valve for safety.
USA
Built-in Patio Heaters to be installed in Aircraft Hangars must be installed in accordance
with American National Standards for Aircraft Hangars, ANSI/NFPA No. 409.
Heaters to be installed in public garages must be installed in accordance with NFPA No.
88A standards for parking structures.
Heaters must be installed so that minimum clearances marked on the heater will be
maintained from vehicles parked below the heater. The installation must conform with ANSI
standard No. Z223.1 National Fuel Gas Code and any applicable local codes.
Canada
The installation must conform with local building codes or, in the absence of local codes,
with National Standards of Canada CAN/CGA-B 149.1 & 2-M86.
Each heater must be electrically grounded in accordance with the National Electrical Code,
ANSI/NFPA 70 when an external electrical source is utilized. In Canada, the CSA Canadian
Electrical Code, C22.1, Part 1 applies.
The gas inlet supply and normal operating manifold pressure for each heater are as follows.
For gas supply line pressures in excess of 1/2 psig, contact your dealer or Customer Care.
Gas inlet pressure
Note: This unit is for use with natural gas only.
MAXIMUM PRESSURE MINIMUM PRESSURE MANIFOLD PRESSURE
1/2 psig 6" W.C.* 5" W.C.*
*The heater has an internal 5" W.C. regulator.

14
INSTALLATION
Do not locate either the gas or electrical supply line directly over the top of the heater, due
to the extreme heat that may cause overheating or damage. The heater must be installed in
a location that is accessible for service. The heater must be installed in a way that doesn’t
restrict fresh airflow to the unit. The heater cannot be installed in a recessed area. Doing so
may cause poor performance and heat damage to the surrounding area.
Mounting
Each heater must be installed so that the minimum clearance to combustibles are
maintained. Combustible materials are defined as wood, paper, foliage, plastic, plexiglass
or other materials capable of being ignited and burned. Such materials shall be considered
combustible even though flame-proofed, fire retardant treated or plastered. Additional
clearances may be required for glass, painted surfaces and other materials which may be
damaged by radiant or convection heat.
Electrical
IMPORTANT!
A 24 VAC, 40 VA transformer has been included with the product.
It is imperative to use this transformer.
The on-off control of the heater should be controlled from 120 VAC side of the transformer
(see wiring diagram). A UL approved outdoor wall switch must be used for this purpose.
The transformer must be mounted a minimum of 12" from the heater in a weather protected
cover. Do not put the transformer in the heater or above the heater (this will damage
the unit.) A step down transformer approved as having at least a 40 VA rating must be
utilized for each connected heater. Control wires used to electrically connect one or more
heaters together must have both adequate capacity and insulation temperature ratings for
the total connected load. Use at least 18 ga. wire up to 50 ft. from heater to transformer
or wall switch. Use 16 ga. over 50 ft. distance. If the original wires supplied should need
replacement, they must be replaced with wiring material having a temperature rating of at
least 221°F (105°C).

15
INSTALLATION
Gas piping
A minimum pipe size of 1/2" is required for inlet piping. A 1/2" lever handled shut-off gas cock
should be installed within 6 feet of the appliance for servicing the unit. Check with local and
state plumbing and heating codes regarding sizing of the gas lines. Installation of a drip leg
in the gas supply line going to each heater is required to minimize the possibility of any loose
scale or dirt within the gas supply line from entering the heater’s control system. A 1/8" NPT
plugged test gage connection is required immediately upstream of the gas supply connection
to the heater.
Do not block air inlets or restrict airflow to the air inlets.
*Installer supplied.
gas pipe*
drip leg with 1/8"
NPT plugged test
gage connection
air inlets
gas shut-off valve*
1/2"
conduit*

16
INSTALLATION
Ventilation
A minimum building ventilation rate of 4 CFM per 1,000 BTU of installed heater input must
be provided. This rate of ventilation may be obtained through either gravity or mechanical
ventilation of the building. In conjunction with building ventilation system, adequate fresh
air into the building must be provided through fresh air inlets and/or building inlets. It is
recommended local code be checked to assure the ventilation system and heat installation
are in compliance with local and/or state codes.
Note: Gas connections on the heater are leak tested at the factory prior to shipment.
WARNING!
zWhen checking for gas leaks, do not use an open flame. Use a soap and water solution.
zPeriodically check the whole gas system for leaks or immediately check if the smell of
gas is detected. Extinguish all open flames.
zNever leak test while smoking.
zDo not use heater until all connections have been leak tested and do not leak.
zWhen leak testing, refer to the connections diagrams.
zOnly those parts recommended by the manufacturer should be used.
zSubstitution can void warranty.
Leak test
1 Make a soap solution of one part liquid detergent, and one part water. The soap solution
can be applied with a spray bottle, brush or rag. Soap bubbles will appear where a
leak is present.
2 Turn the gas supply “ON” check for leaks at leak points. If a leak is present, turn off
supply, tighten any leaking fittings, turn gas on and recheck.
Note: There is a manual shut-off lever on the internal heater control valve/regulator. This
lever is shipped in the “ON” position.
ON
OFF

17
LIGHTING INSTRUCTIONS
Upon installation of the heater and completion of the gas line and electrical supply to
each heater, follow the steps below for Lighting Instructions. Lighting instructions are also
provided on the control panel of the heater.
Turn gas and power to “ON”. The burner should light within the first 4 seconds. If not,
the flame sensor will shut off the mini-igniter. The unit will attempt to light 3 times before
“locking out”. During initial installation, this will happen if the gas line is not purged. To reset
the control, shut off the power to the unit and wait 5 minutes. Turn power back to “ON”
position. This will allow for 3 more lighting attempts.
To start heater
1 Turn manual gas valve to ON position.
2 Turn electrical supply ON.
To shut down heater
1 Turn electrical supply OFF.
2 Turn manual gas valve to OFF position.
WARNING!
zIf burner fails to ignite, shut down electrical power and wait 5 minutes before turning
power ON to allow any gas to dissipate.
zDo not attempt to light this heater by hand.
A remote control accessory (DRH-RMT) is available.

18
WIRING/SCHEMATIC DIAGRAMS
Wiring schematic
Wiring component diagram
flame
sensor
gas
valve
2
1
mini
igniter
ground
lug
ignition
module
1
2
3
4
5
6
7
fuse
24 VAC
transformer
N
L1
SW
1. PUR – flame sensor
2. GRN – ground
3. BLU – gas valve (term #1)
4. ORG – thermostat
5. (Blank)
6. BLK – 24 VAC
7. RED – igniter
short to bypass
flame sensor
flame
sensor
gas
valve
igniter
24 VAC
120 VAC
60 HZ
N
L1
fuse
10 AMP – 32 VOLT
#2 #1
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