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520H Direct Vent Indoor Models
On-Demand Condensing Water Heater
Installation Manual and Owner's Guide
Gas Tankless Water Heater
520H Direct Vent Indoor Models
Suitable for potable water heating and space-heating*
* Please refer to local codes for space-heating compliance.
FEATURING
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
• EASY-LINK SYSTEM
520H model
only
This product must be installed
and serviced by a licensed
plumber, a licensed gas fitter,
or a professional service tech-
nician. Improper installation
and/or operation, or installation
WARNING
by an unqualified person, will
void the warranty
- Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of this
or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas suppli-
er's instructions.
• If you cannot reach your gas supplier, call
the fire department.
- Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property dam-
age, personal injury or death.
WARNING
If you have any questions,
please call or write to:
GSW Water Heating
599 Hill Street West
Fergus, ON Canada N1M 2X1
Toll Free: 1-888-479-8324
320577-000
REV. 00 (10-12)
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Table of Contents
Related Manuals for GSW 520H
Summary of Contents for GSW 520H
- Page 1 520H Direct Vent Indoor Models On-Demand Condensing Water Heater Installation Manual and Owner’s Guide This product must be installed and serviced by a licensed plumber, a licensed gas fitter, or a professional service tech- 520H model nician. Improper installation only...
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Page 2: Table Of Contents
Flow........28 520H Model Installation ......8 Freeze Protection System. -
Page 3: Specifications
Water Pressure 5 - 150 psi* needs. • The 520H is a high efficiency model with an in-build sec- Natural Gas Inlet Min. 5.0" WC ondary heat exchanger that absorbs latent heat from the Pressure Max. -
Page 4: Safety Guidelines
C22.1 Canadian Electrical Code Part 1. INSTALLATION 3. Carefully plan where you intend to install your 520H Water Heater. All gas water heaters require careful and correct installation Please ensure: to ensure safe and efficient operation. This manual must be •... -
Page 5: General
The manufacturer will not cable, the product registration card and the PVC adaptor be responsible for any water damage are included with the unit (the adaptor comes with the 520H that may occur. If you install a drain pan model only). -
Page 6: Optional Items
The Temperature Remote Controller has two functions. It allows the output temperature from the 520H to be adjusted within the range of 38°C to 85°C (100°F to 185°F), and it also works as a diagnostic tool that will give a con- cise error code whenever there is a problem with the unit. -
Page 7: Warning For Installations
Warning For Installations High-altitude Installations Check the elevation where your water heater is installed. FOR YOUR SAFETY, READ Set DIPswitches shown in the table below depending on the BEFORE INSTALLATION altitude. These DIPswitches (No. 5 and No. 6) are on the computer board on the left bank only. -
Page 8: 520H Model Installation
520H Model Installation Venting Instructions General The 520H models are equipped with a thermistor and hi-limit switch for the exhaust gas, detecting excess temperatures within the flue and enabling the unit to safely stop opera- Improper venting of this appliance can tions if needed. -
Page 9: Exhaust Vent (Stainless Steel Vent)
(3 in) PVC Concentric Termination carbon monoxide and flue gases poison- ing. Improper installation will void product For details on the vent connection to the 520H, refer to pg. warranty. WARNING 10 & 11. -
Page 10: Pvc Venting Illustrations
See the next page for Roof instructions. Roof Flashing How to install PVC venting with the 520H (For Exhaust) 1. Connect the TH-PA01 PVC adaptor* directly on the exhaust vent collar of the water heater. Fire stop 2. Connect a 102mm (4 in.) PVC coupler (or 4x3" PVC reducer) to the TH-PA01 PVC adaptor. -
Page 11: Stainless Steel Venting Illustrations
• Do not common vent or connect any vent from other appliances to the 520H water heater vent. • Use 102mm (4 in.) Category III/IV approved or Special BH, single or double wall stainless steel vent pipe. -
Page 12: Vent Clearances
Vent clearances R N E E C O I N S I D D E T A Vent terminal Air supply inlet Area where is not permitted R A B F I X E O P E S E D C L O F I X E S E D... -
Page 13: Additional Clearances
Additional clearances For rooftop terminations Please follow all local and national codes in regards to prop- er termination clearances. In the absence of such codes, the following clearances can be used as guidelines. Local codes supersede these guidelines. For sidewall terminations 6 1 0 m 6 1 0 m ( 2 f t . -
Page 14: Gas Supply And Gas Pipe Sizing
Propane Gas Min. 8.0" WC – Max. 14.0" WC Pressure port 2. Gas pressure below this specified range for the 520H and/or insufficient gas volume will adversely affect per- formance. These pressures are measured when the 520H is in full operation. -
Page 15: Water Connections
WARNING Pressure Relief Valve The 520H has a high-temperature shut off switch built in as a standard safety feature (called a Hi-Limit switch) therefore a “pressure only" relief valve is required. Condensate... -
Page 16: Condensate Drain Connections
There is a flow direction indicator on the WARNING neutralizer. Please orient the neutralizer in the proper direction. The 520H models are high efficiency condensing water Connect a 1/2" drain tube to the other end of neutral- heaters that produce condensate (acidic water). The acidic izer. -
Page 17: Electrical Connections
2. The 520H requires 120 VAC / 60 Hz electrical power sup- • The Neutralizer cartridge is designed ply that is properly grounded. -
Page 18: Remote Controller Connection
Installation Pull the remote’s wires through the rubber grommet at Manual. the bottom of the water heater’s casing. Remote controller terminal of the 520H Front of remote Back of remote Connect to these terminals... -
Page 19: Pump Control Modes
To control a recirculation pump, connect the 520H. (see below.) These 4 modes only affect pumps that pump to the “Pump connector" in the 520H as shown in the are connected to the 520H pump control (pg. 19) diagram below. -
Page 20: No.6 On
General Feature: Operates similarly to the standard Recirculation The 520H can be connected with other heaters of the same Control mode, but saves more energy by limiting model with communication cables to work as a multiple-unit the temperature within the recirculation loop. - Page 21 (C) Examples of incorrect settings and/or connections puter boards display the unit #. The numbering system of CASE 1: the 520H automatically allocates the unit # to each water • Unless you change DIPswitch No.10 of the “PARENT" heater in the Easy- Link system, in accordance with the unit to the “ON"...
- Page 22 CASE 3: CASE 4: • If you connect the “PARENT connector" of the “CHILD- • If a remote controller (optional) is used, it has to be con- 1" unit to the “[1] connector" of the “CHILD-2" unit, the nected to the “PARENT" unit. If the remote controller “CHILD-2"...
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Page 23: Applications
• The 520H can be used to supply potable water and space heating and shall not be connected to any heating system or component(s) previously used with non-potable water where any chemicals were added to the water heating appliances. -
Page 24: Recirculation
The recirculation pump is to be controlled by: • Dual-set aquastat (recommended w/timer) • 520H Pump Control set to “Recirculation Mode". • The recirculation pump is to provide no less than 7.5 l/min (2 GPM (US)) and no more than 15 l/min (4 GPM (US)) through each activated unit in the system. -
Page 25: Initial Operation
INITIAL OPERATION 1. Once the above checks 2. Fully open the manual have been completed, water control valve on FOR YOUR SAFETY, READ please clean filter of any the water supply line. BEFORE OPERATING debris. Refer to pg. 29 for instructions. •... -
Page 26: Operating Safety
OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This water heater does not have a pilot. It is equipped with an ignition device that automatically lights the burner. Do not try to light the burner by hand. - Page 27 DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the water heater. Keep flammable products: Vapors: Far away from heater Cannot be seen...
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Page 28: Normal Operation
520H is rated for 1079 l/hr (285 GPH (US)) or 18 l/min (4.8 GPM (US)) for Natural Gas and for Liquid Propane, when raising the water temperature by 43C° (77F°) (from... -
Page 29: Freeze Protection System
Filter with Filter the 520H model. In such an installation, freezing issues 3. Wait 30 seconds, and can only occur if cold air enters through the venting into then turn off power to the the heat exchanger, whether by negative pressures unit, yet again. -
Page 30: Troubleshooting
TROUBLESHOOTING General PROBLEM SOLUTIONS It takes long time to • The time it takes to deliver hot water from the water heater to your fixtures depends get hot water at the on the length of piping between the two. The longer the distance or the bigger the fixtures. - Page 31 PROBLEM SOLUTIONS How are the unit num- • For an Easy-Link system, the Parent Button to check bers assigned? unit is always labeled #1 and all other unit numbers subsequence Child units are numbered randomly. • To check which numbers are assigned to which Child units, push the button on the computer board of any Child unit as 7-Seg LED...
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Page 32: Error Codes
Fault Analysis Of Error Codes • The 520H units are self diagnostic for safety and conve- If there is a problem with the installation of the 520H, it will nience when trouble shooting. display a numerical error code on the 7-seg LED of the •... -
Page 33: Components Diagram
COMPONENTS DIAGRAM Burner Assembly 520H Case Assembly 1 0 1 520H 1 0 2 1 0 3 1 5 2 1 5 2 0 1 4 0 5 2 0 0 4 0 1 2 0 0 3 1 5 2... -
Page 34: 520H
Water Way Assembly 520H 4 4 5 4 4 1 4 4 0 4 0 2 1 5 2 4 4 2 4 0 1 4 4 9 4 0 4 4 4 4 1 2 6 7 0 6... -
Page 35: 520H
Part # Description Heat exchanger protection plate Item # Part # Description EX12X (Front) EKH5B Case assembly for 520H Heat exchanger protection plate EKH5M Front cover for 520H EX12Y (Right) EV00K Intake air port assembly Heat exchanger protection plate EX12Z... - Page 36 EKH65 Exhaust chamber assembly EKH62 Secondary heat exchanger plate EKH38 Heater fixing plate 20 EK031 Heater fixing plate 16 EKH4E 520H PCB EM296 Transformer EKJ66 Junction box inner plate Freeze protection and EH-IG wire EKH79 for 520H EKH6V Gas valve wire...
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Page 37: Output Temperature Chart
OUTPUT TEMPERATURE CHART Chart is based on properly sized gas line 520H Models Output Temperature vs. GPM (Max. 9.0 GPM) with Various Ground Water Temperature Output Hot Water Temperature *When the set temperature is 55°C (130°F) or higher, maximum flow rate is limited to 4.8 GPM. -
Page 38: Limited Warranty
INDIRECT CONSEQUENTIAL DAMAGES INCLUDING PROPERTY DAMAGE, PERSONAL DAMAGES, LOSS OF USE, OR INCONVENIENCE. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU. 2. Warranty for models 520H. Labor Application... - Page 39 5. THIS WARRANTY WILL NOT COVER THE FOLLOWING: • Any product that is not installed by a licensed plumber, gas installer, or contractor. • Damages due to accidents, abuse, misuse, improper installation, misapplication, or incorrect sizing. Damages due to fires, flooding, freezing, electrical surges, or any Acts of God. •...
- Page 40 If you have any questions, please call or write to: GSW Water Heating 599 Hill Street West Fergus, ON Canada N1M 2X1 Toll Free: 1-888-479-8324...
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