BRADFORD WHITE RTGS199N1 Tankless Heater Instruction Manual

: June 3, 2024
: Bradford White

Table of Contents

BRADFORD WHITE RTGS199N1 Tankless Heater
Safety Regulations
Introduction
Water Heater Sizing and Specifications
Specifications
| Name of Component
| Name of Component
| Name of Component
| Name of Component
- Water Heater Sizing
Single Unit Applications
Multi-Unit Applications
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BRADFORD WHITE RTGS199N1 Tankless Heater

BRADFORD WHITE RTGS199N1 Tankless Heater-produc t

Safety Regulations

Safety Symbols

WARNING

Warnings in this document are identified by a warning triangle printed against a grey background. Keywords at the start of a warning indicate the type and seriousness of the ensuing risk if measures to prevent the risk are not taken.
For safety symbols, ‘DANGER’, ‘WARNING’, CAUTION’ are indicated and the definitions for these terms are as follows:

DANGER
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. This signal word is limited to the most extreme situations.
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.

Safety
PLEASE READ SAFETY PRECAUTIONS BEFORE INSTALLATION.
WARNING

These instructions are intended as an aid to professional service personnel for proper installation, adjustment and operation of this unit. Read all instructions prior to attempting installation or operation. Failure to comply with instructions can result in improper installation, adjustment, and possibly result in fire, electrical shock, property damage, personal injury or death.
WARNING
Disconnect all power to the unit before starting any service or maintenance. Failure to do so could cause severe electrical shock resulting in personal injury or death.

Introduction

This Manual is used to present some of the most common applications for the appliance. Drawings are shown with both piping and corresponding electrical connections where applicable. Field supplied equipment shown in this manual does not represent any one manufacturer or specific model. This manual does not cover all potential installation practices and piping techniques possible when installing water heating appliances. It is the responsibility of the professional installer to determine the best solution for the application, as well as abide by local building codes.

NOTICE

In this manual concept drawings are used to show common applications, and do not cover all safety, design, or installation considerations. Additional safety and/or auxiliary equipment may be needed. Reference concept drawings are for use by officials, designers and professional installers. Installers must have adequate knowledge of best industry practices, procedures, and applications involved. It is the responsibility of the professional installer to ensure that the installation abides with local building codes.

This manual covers the most common system application however it is not the intention of this manual to cover all potential applications as possibilities are nearly endless. If an application is not covered within this manual and questions surrounding best practices arise please contact the manufacturer with specific application needs.
This manual is not to be used in place of the installation and operation manuals included with the appliance. For a copy of the applicable Installation and operation materials a copy can be downloaded from the manufacturer’s website. All manuals/specifications are subject to change.

NOTICE

Installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: Installation must conform with CGA B149.(1,2) INSTALLATION CODES and/ or local installation codes.

Water Heater Sizing and Specifications

This section describes sizing rules for the RTGS and RTGR series water heaters from
Bradford White Corporation and provides a general overview to the specification sheets and model. More detailed information is contained in the installation manuals.
Download manuals at www.bradfordwhite.com

Sizing for specific application or loads
Peak Demand Sizing by Flow rate x Rise
The peak demand is the product of the flow rate and rise. Flow rate is the number of gallons per minute being demanded. the Rise is the difference between the demanded setpoint and the inlet temperature. If inlet temperature and inlet temperature cannot be determined refer to the fixture count method.
Determining Peak Demand Flow:

Determine which fixtures will be used simultaneously. The total flow rate is the peak demanded flow. Determine the flow rate of each of these fixtures and total them.
To determine flow rate determine the length of time required to fill a known volume. Using the fill time and the container volume and the equation below calculate peak flow rate. (example: 20 seconds to fill 1 gallon container = 3 GPM)

Counting Fixtures to determine Peak Demand Flow:

Each Sink will flow ~1 GPM.
Each Shower will flow ~ 2 GPM.
Each Bath/Garden tub will flow 3.5-4.5 GPM
Total all simultaneous flow rates for peak demand flow.

Determining Rise:

Using a thermometer run a cold water fixture until the room temperature water is purged from the cold water line. Rise is the difference between the demanded setpoint and this cold water temperature. For example if inlet water is 58°F and setpoint is 120°F the rise is 62°F. If supply water temperature cannot be measured refer to the chart on the next page for general ground water temperatures.

Example Peak BTU Demand Calculation:

Peak Flow is two showers and one sink, 2+2+1 = 5 GPM.
Supply is 58°F and Setpoint is 120°F, 120°F – 58°F = 62°F
Peak BTU demand = 525 62(°F) 5(GPM) = 162,750 BTU / hr.

Specifications

Model Name	RTGS199N1 / RTGS199X1	RTGR199N1 / RTGR199X

Gas Input Rate

| MAX| 199,000 Btu/h
MIN| 18,000 Btu/h
High Elevation| 180,000 Btu/h

Hot Water Capacity

| 35°F Rise| 11.1 Gal/min (42 L/min)
45°F Rise| 8.7 Gal/min (32.9 L/min)
77°F Rise| 5.1 Gal/min (19.3 (L/min)
Installation| Indoor / Outdoor Wall Hung (with outdoor vent cap)
Flue System| Sealed Combustion Direct Vent, Single Vent, Outdoor
Max Vent Run| 2” (60ft) / 3” (150ft) Schedule 40 PVC, CPVC, PP

Orifice Size

| NG (Gas / Needle)| 0.330” (8.4mm) / 0.342” (8.7mm)
LP (Gas / Needle)| 0.259” (6.6mm) / 0.263” (6.7mm)

Gas Supply Pressure

| NG| 3.5” WC to 10.5” WC
LP| 8.0” WC to 14” WC

Manifold Pressure

Power Consumption

Water Pressure

| MAX| 150 psi
MIN| 15 psi

Materials

| Casing| Cold Rolled Carbon Steel
Heat Exchanger| Heat Exchanger : SS 304
Safety Devices| Flame Sensor, Overheat Cut Off Switch , Gas Leak Detector, Water Leak Detector, Exhaust Temperature Sensor, Water Temperature Sensor

Temperature

Operating ambient Temperature Range : Range: 14°F to 140°F (-10 to 60°C).
Operating Relative Humidity up to: 90% at 104°F (40°C).
Shipping & Storage Temperature Range of : -4°F to 176°F (-20 to 80°C).

Dimensions

RTGR199N1 / RTGR199X1 BRADFORD WHITE RTGS199N1 Tankless
Heater-4

| Description| Size
---|---|---
A| Exhaust| 2″ PVC
B| Air Intake| 2″ PVC
C| Hot Water| 3/4″ NPT
D| Condensate| 1/2″ NPT
E| Recirculation Return Connection| 3/4″ NPT
F| Cold Water Connection| 3/4″ NPT
G| Gas| 3/4″ NPT
H| Cold Water Filter| –
I| Recirculation Return Filter| –

Dimensions: RTGS199N1 / RTGS199X1

| Description| Size
---|---|---
A| Exhaust| 2″ PVC
B| Air Intake| 2″ PVC
C| Gas| 3/4″ NPT
D| Condensate| 1/2″ NPT
E| Hot Water Connection| 3/4″ NPT
F| Cold Water Connection| 3/4″ NPT
G| Cold Water Filter| –

Components

Name of Components: RTGS199N1 / RTGS199X1 BRADFORD WHITE RTGS199N1 Tankless
Heater-6

| Name of Component

---|---
1| Vent Pipe Collar
2| Combustion Air Intake Assembly
3| Ignition Transformer
4| Igniter
5| Flame Detection Sensor
6| High Limit Switch
7| Sight Glass
8| Terminal Port
9| Circulation Water Pump
10| Mixing Valve
11| Water Leak Detector
12| Domestic Hot Water (DHW) Outlet
13| Condensate Trap Cleanout
14| Recirculation Return Water Connector

| Name of Component

---|---
15| Cold Water Inlet
16| Gas Inlet
17| Main Controller
18| Water Adjustment Valve
19| Control Panel
20| Manual Power Switch
21| Secondary Heat Exchanger
22| Primary Heat Exchanger
23| Gas Valve
24| Air Gas Mixture (AGM) Actuator
25| Blower
26| Air Intake Filter
27| Air Intake Collar

▪ Name of Components: RTGS199N1 / RTGS199X1

| Name of Component

---|---
1| Vent Pipe Collar
2| Combustion Air Intake Assembly
3| Ignition Transformer
4| Igniter
5| Flame Detection Sensor
6| High Limit Switch
7| Sight Glass
8| Terminal Port
9| Water Mixing Valve
10| Main Controller
11| Water Leak Detector
12| Gas Inlet
13| Domestic Hot Water (DHW) Outlet
14| Condensate Trap Cleanout

| Name of Component

---|---
15| Cold Water Inlet
16| Cold Water Filter
17| Condensate Trap
18| Water Adjustment Valve
19| Control Panel
20| Manual Power Switch
21| Secondary Heat Exchanger
22| Primary Heat Exchanger
23| Gas Valve
24| Air Gas Mixture (AGM) Actuator
25| Blower
26| Air Intake Filter
27| Air Intake Collar

Water Heater Sizing

Pressure Drop of Appliance
RTGS199N1 / RTGS199X1, RTGR199N1 / RTGR199X1
Pressure Curve of Internal Pump(if applicable ) Equivalent Power Pumps to RTGR Internal pump:
- taco 008
- Grundfos UP15-55

Single Unit Applications

Water Heater Modes (RTGR199N1, RTGR199X1)
Applications shown in this section are for single appliances. If cascading is required refer to Section 5 Multiple Unit Installations.

Mode

|

Description

| Setting| Requirement| Performance
---|---|---|---|---

11:RC

| Dedicated Return Line|

Accessory

| Wait Time Water Savings| Energy Savings| Hot Water Temperature
oFF

No Recirculation

| Recirculation Pump remains

Idle.

| OFF| No| –| –| –| –
Itnl Internal| Hot water circulates within the appliance, No return line needed.| Itnl| No| –| Better| Better| Better
Etnl External| Hot water circulates within the house using external return line.| Etnl| Yes| –| Best| Better| Best
tt24 title 24| External recirculation when demand button is pressed.| tt24| Yes| O| Better| Best| Best
CrOS

Crossover Valve

Recirculation is activated by Timer [Auto / Manual] Recirculation timer setting can be changed by customer’s own desire time.
Auto (self learning mode) function can be selected by customer’s need.

No Recirculation Mode, Internal Recirculation Mode

Only POTABLE water may be plumbed through the water heater.
The water heater cannot be used for space heating application
Expansion tank is required if a backflow preventer is installed

Recirculation Mode [ External Mode]

Provides most comfortable option. Maintains consistent hot water availability during specified times
Timer can be manually customized or programmed to automatically learn daily usage patterns.
Ability to optimize by using Installer Mode function 3: RT to adjust loop temperature for maximum comfort and safety.

The recirculation return pipe must be installed in the field in order to apply the ‘External Mode’.
This mode allows the hot water pipes to be warmed up and also serves as the freeze protection function.

Recirculation Mode

On Demand(tt24) Mode

Provides best energy savings option with recirculation.
Designed to meet California Title 24 requirements.
Recirculation will only operate after the push button switch is pressed. Hot water will not be available immediately.
Built-in timer function is disabled.
Circulation pump will start on-demand to purge cold water from the water lines and replace with hot water.
Pump will stop operating once hot water has successfully reached 102°F at the installed temperature sensor.
Do not repeatedly press on-demand button. Title 24 function will not operate again until the water at the return is cool.

Crossover(CrOS) Mode]

Provides recirculation option for homes without a dedicated return line by utilizing the cold water line as a return line.
Timer can be manually customized or programmed to automatically learn daily usage patterns.
In order to prevent hot water from being supplied into the cold water line, the thermal element in the crossover valve will close at about 95°F. As a result, hot water may not be available at all times (only warm water).

Water Heater Mode (RTGS199N1, RTGS199X1)

Mode

| ****

Description

| Setting| Requirement| Performance
---|---|---|---|---
11:RC| Dedicated Return Line| Accessory| Wait Time Water Savings| Energy Savings| Hot Water Temperature
No Recirculation| Heat water as draws occur, no recirculation occurs| OFF| No| –| –| –| –
Pulse| Unit controls an External pump with a dedicated return| PuLS| No| –| Best| Better| Best
TT24

(Title24)

*Models not equipt with a built-in pump will require a field supplied circulator to be installed for use with recirculation modes, See section 3.6 Water Heater Sizing for pressure curves for circulator sizing. BRADFORD WHITE RTGS199N1 Tankless Heater-14 Pulse Mode

Mode

|

Description

| Setting| Requirements| Performance
---|---|---|---|---
12:Ah| Dedicated Return Line| Accessory| Energy Savings
Standard Air Handler| Pairs with Air handler for

space heat.

| Std| Yes| Thermostatic

Mixing valve

Air Handler Standard Mode

Water heater receives signal from the Room Thermostat and it will control the Air Handler as per flow switch condition
It prevents simultaneous operation of DHW and heating to eliminate cold wind during heating or lower water temperature during shower
No usage during Anti oFF setting time, it can operate arbitrarily during the Anti on time for preventing bacteria in the heating pipe.

Multi-Unit Applications

Water Heater Mode (RTGR199N1, RTGR199X1)

Mode

| ****

Description

| Setting| Requirement| Performance
---|---|---|---|---

11:RC

| Dedicated Return Line| ****

Accessory

* Recirculation is activated byTimer [Auto / Manual]

Mode

|

Description

| Setting| Requirement| Performance
---|---|---|---|---

13:Cn

| Dedicated Return Line|

Accessory

| Wait Time Water Savings| Energy Savings| Hot Water Temperature

Cascaded

|

Multiple heaters used for increased heat capacity

| 01:Leader 02:Follower 1

03:Follower 2

|

No

|

Cascade Cable

|

–

|

–

|

–

No Recirculation Mode, Internal Recirculation Mode

Only POTABLE water may be plumbed through the water heater.
The water heater cannot be used for space heating application
Expansion tank is required if a backflow preventer is installed

Recirculation Mode [ External Mode]

Provides most comfortable option. Maintains consistent hot water availability during specified times
Timer can be manually customized or programmed to automatically learn daily usage patterns.
Ability to optimize by using Installer Mode function 3: RT to adjust loop temperature for maximum comfort and safety.

The recirculation return pipe must be installed in the field in order to apply the ‘External Mode’.
This mode allows the hot water pipes to be warmed up and also serves as the freeze protection function.

Recirculation Mode

Crossover(CrOS) Mode

Provides recirculation option for homes without a dedicated return line by utilizing the cold water line as a return line.
Timer can be manually customized or programmed to automatically learn daily usage patterns.
In order to prevent hot water from being supplied into the cold water line, the thermal element in the crossover valve will close at about 95°F. As a result, hot water may not be available at all times (only warm water).

Water Heater Mode (RTGS199N1, RTGS199X1)

Mode

| ****

Description

| Setting| Requirement| Performance
---|---|---|---|---
11:RC| Dedicated Return Line| Accessory| Wait Time Water Savings| Energy Savings| Hot Water Temperature
No Recirculation| Heat water as draws occur, no recirculation occurs| OFF| No| –| –| –| –
Pulse*| Unit controls an External pump with a dedicated return| PuLS| No| –| Best| Better| Best

*Models not equipt with a built-in pump will require a field supplied circulator to be installed for use with recirculation modes, See section 3.6 Water Heater Sizing for pressure curves for circulator sizing.

No Recirculation Mode Pulse Mode