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1. Weil-mclain Uo-3e High-limit-control User's Manual Transmission
2. Weil-mclain Uo-3e High-limit-control User's Manual Pdf
3. Weil-mclain Uo-3e High-limit-control User's Manual Instructions
4. Weil-mclain Uo-3e High-limit-control User's Manual 2017

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Gas-Fired Water Boilers

If the information in this manual is not followed exactly, a fire or explosion may result, causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable 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 electrical switch; do not use any telephone in your building.

•Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.

•If you cannot reach your gas supplier, call the fire department.

Installation & service must be performed by a qualified installer, service technician or the gas supplier.

GV90+ gas-fired water boiler — User’s Information Manual

Please read this page first

GV90+ gas-fired water boiler — User’s Information Manual

STOP!! — Read before proceeding

User — Have this boiler serviced/ inspected by a qualified service technician, at least annually.

Failure to comply with the above could result in severe personal injury, death or substantial property damage.

When calling or writing about the boiler— Please have the boiler model number from the boiler rating label and the CP number from the boiler jacket.

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

Indicates presence of hazards that will cause severe personal injury, death or substantial property damage.

Indicates presence of hazards that can cause severe personal injury, death or substantial property damage.

Indicates presence of hazards that will or can cause minor personal injury or property damage.

Indicates special instructions on installation, operation or maintenance that are important but not related to personal injury or property damage.

Failure to adhere to the guidelines on this page can result in severe personal injury, death or substantial property damage.

Boiler service and maintenance —

•To avoid electric shock, disconnect electrical supply before performing maintenance.

•To avoid severe burns, allow boiler to cool before performing maintenance.

•You must maintain the boiler as outlined in the manual and have the boiler started up and serviced at least annually by a qualified service technician to ensure boiler/system reliability.

Boiler operation —

•Do not block flow of combustion or ventilation air to boiler. This boiler is equipped with a control which will automatically shut down the boiler should air or vent be blocked. If vent or air blockage is easily accessible and removable, remove it. The boiler should attempt to restart within an hour. If blockage is not obvious or cannot be removed, have the boiler and system checked by a qualified service technician.

•Should overheating occur or gas supply fail to shut off, DO NOT turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance.

•Do not use this boiler if any part has been under water. Immediately call a qualified service technician to inspect the boiler and to replace any part of the control system and any gas control that has been under water.

Combustion air —

•DO NOT install combustion air intake where there is a risk of combustion air contamination.

Carbon monoxide detector —

•For Direct Exhaust units, a carbon monoxide detector is required in the boiler room. The carbon monoxide detector must be wired on the same electrical circuit as the boiler.

•For Direct Vent units, a carbon monoxide detector that is wired on the same electrical circuit as the boiler is strongly recommended.

Boiler water —

•Do not use petroleum-based cleaning or sealing compounds in boiler system. Gaskets and seals in the system may be damaged. This can result in substantial property damage.

•Leaks in boiler or piping must be repaired at once to prevent make-up water. Use this boiler ONLY in a closed-loop system.

Continual fresh make-up water will reduce boiler life. Mineral buildup in heat exchangers reduces heat transfer, overheats the materials, and causes failure. Addition of oxygen carried in by make-up water can cause internal corrosion.

•Do not add cold water to hot boiler. Thermal shock can cause heat exchanger to crack.

Freeze protection fluids —

•NEVER use automotive or standard glycol antifreeze. Use only freezeprotection fluids made for hydronic systems. Follow all guidelines given by the antifreeze manufacturer. Thoroughly clean and flush any replacement boiler system that has used glycol before installing the new boiler.

GV90+ gas-fired water boiler — User’s Information Manual

Prevent combustion air contamination —

Common household and hobby products often contain fluorine or chlorine compounds.When these chemicals pass through the boiler, they can form strong acids in the vent system or boiler. The acid can eat through the vent or boiler wall, causing serious damage and presenting a possible threat of flue gas spillage into the building.

Please read the information below. If the contaminating chemicals will be present, have your installer pipe the boiler air from outside per the Boiler manual.

If the boiler is installed in any area likely to cause contamination, or if products which would contaminate the air cannot be removed, you must pipe combustion air to the boiler air intake. Contaminated combustion air will damage the boiler and vent system, resulting in possible severe personal injury, death or substantial property damage.

Do not operate a GV90+ boiler in a laundry room or pool facility, for example, without using ducted outside air. These areas will always contain contaminants.

Ensure that the combustion air will not contain any of the contaminants in Figure 1.

Combustion air supply openings or intake terminations must NOT be near a swimming pool, for example.

Avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.

Figure 1 Corrosive contaminants and sources

Products to avoid

Spray cans containing chloro/fluorocarbons

Permanent wave solutions

Chlorinated waxes/cleaners

Chlorine-based swimming pool chemicals

Calcium chloride used for thawing

Sodium chloride used for water softening

Refrigerant leaks

Weil-mclain Uo-3e High-limit-control User's Manual Transmission

Paint or varnish removers

Hydrochloric acid/muriatic acid

Cements and glues

Antistatic fabric softeners used in clothes dryers

Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry rooms

Adhesives used to fasten building products and other similar products

Excessive dust and dirt

Areas likely to have contaminants

Dry cleaning/laundry areas and establishments

Swimming pools

Metal fabrication plants

Beauty shops

Refrigeration repair shops

Photo processing plants

Auto body shops

Plastic manufacturing plants

Furniture refinishing areas and establishments

New building construction

GV90+ gas-fired water boiler — User’s Information Manual

Perform maintenance per schedule below

Figure 2 Service and maintenance schedules

Service technician

(see Boiler Manual for instructions)

Owner maintenance

(see following pages for instructions)

GV90+ gas-fired water boiler — User’s Information Manual

User maintenance procedures

Boiler must be serviced and maintained

DAILY

Maintenance

The boiler should be inspected and started annually, at the beginning of the heating season, only by a qualified service technician. In addition, the maintenance and care of the boiler designated on page 5 and explained on the following pages must be performed to assure maximum boiler efficiency and reliability. Failure to service and maintain the boiler and system could result in equipment failure, causing possible severe personal injury, death or substantial property damage.

The following information provides detailed instructions for completing the maintenance items listed in the maintenance schedule, page 5. In addition to this maintenance, the boiler must be serviced and started up at the beginning of each heating season by a qualified service technician.

Check boiler area

To prevent potential of severe personal injury, death or substantial property damage, eliminate all materials discussed below from the boiler vicinity. If contaminants are found:

Remove products immediately from the area. If they have been there for an extended period, call a qualified service technician to inspect the boiler and vent system for possible damage from acid corrosion.

If products cannot be removed, immediately call a qualified service technician to install an outside combustion air source for the boiler (if not already installed).

1.Combustible/flammable materials — Do not store combustible materials, gasoline or any other flammable vapors or liquids near the boiler. Remove immediately if found.

2.Air contaminants — Products containing chlorine or fluorine, if allowed to contaminate the boiler intake air, will cause acidic condensate in the vent and boiler. This will cause significant damage to the vent and/or boiler if allowed to continue. Read the list of potential materials listed on page 4 of this manual. If any of these products are in the room from which the boiler takes its combustion air, they must be removed immediately or the boiler combustion air must be supplied from outside. See WARNING above.

Check air openings

1.Verify that combustion and ventilation air openings to the boiler room and/or building are open and unobstructed.

2.Verify that boiler vent discharge and air intake are clean and free of obstructions. Remove any debris on the air intake or flue exhaust openings.

Check boiler pressure/temperature gauge

1.Make sure the pressure reading on the boiler pressure/temperature gauge does not exceed 24 psig. Higher pressure may indicate a problem with the expansion tank.

2.Contact a qualified service technician if problem persists.

GV90+ gas-fired water boiler — User’s Information Manual

User maintenance procedures (continued)

Check boiler interior piping

1.Remove boiler jacket top.

2.Visually inspect for leaks around internal piping, circulators, relief valve and other fittings. Immediately call a qualified service technician to repair any leaks.

Have leaks fixed at once by a qualifed service technician. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating cast iron, and causing section failure.

Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to boiler and system components can occur, resulting in possible severe personal injury, death or substantial property damage.

Check venting system

1.Visually inspect the flue gas vent piping for any signs of blockage, leakage or deterioration of the piping. Notify your qualified service technician at once if you find any problem.

Failure to inspect the vent system as noted above and have them repaired by a qualifed service technician can result in vent system failure, causing severe per-

sonal injury or death.

Check automatic air vents (if used — use automatic air vents with diaghragm-type expansion tanks only)

1.See Figure 3.

2.Remove the cap from any automatic air vent in the system and check operation by depressing valve “B” slightly with the tip of a screwdriver.

3.If the air vent valve appears to be working freely and not leaking, replace cap “A”, twisting all the way on.

4.Loosen cap “A” one turn to allow vent to operate.

5.Have vent replaced if it does not operate correctly.

Figure 3 Automatic air vent

GV90+ gas-fired water boiler — User’s Information Manual

User maintenance procedures (continued)

Check condensate system

1.NOTICE — To improve clarity, this illustration of the condensate trap is shown with no air inlet pipe attached. If your boiler has an air pipe connected

here, DO NOT tamper with it. The trap is also shown as item m on page 11.

2.Inspect the condensate P-trap (item 1 in the illustration at right). The trap is

translucent. You should be able to see water in the trap as shown.

3. If the trap does not contain water, turn off the boiler ON/OFF switch and call your boiler service technician immediately.

4.Item 2 in the illustration is the tubing or

pipe from the boiler condensate outlet to the condensate drain or condensate pump. Inspect this tubing or piping, making sure it is in good condition and not obstructed.

If the condensate trap is dry or the condensate line is damaged or obstructed, there is a risk of flue gas flow into the building. The boiler must not be operated and must be inspected and serviced only by a qualified service technician. Failure to comply with this directive could result in the possibility of severe personal injury, death or substantial property damage.

Check boiler relief valve

1.Inspect the boiler relief valve and the relief valve discharge pipe for signs of weeping or leakage.

2.If the relief valve often weeps, the expansion tank may not be working properly. Immediately contact your qualified service technician to inspect the boiler and system.

Test low water cutoff (if installed)

1.If the system is equipped with a low water cutoff, test the low water cutoff periodically during the heating season, following the low water cutoff manufacturer’s instructions.

Clean vent termination & air intake screens

1.Remove all lint and debris from both the boiler air intake screen and the flue discharge screen.

2.The boiler control module will sense blockage of the air intake or flue and lockout if the blockage is excessive. It will signal the failure by flashing the appropriate indicator lights on the control board.

3.If removing the debris does not allow the boiler to operate correctly afterwards, contact your qualifed service technician to inspect the boiler and vent/air systems.

GV90+ gas-fired water boiler — User’s Information Manual

User maintenance procedures (continued)

1.Remove the jacket top panel to access the blower motor.

2.Use only Anderol 465. DO NOT use household universal oils.

Use only Anderol 465 to lubricate the blower motor. Do not use common universal household oils.

3.See Figure 4

4.Place a few drops of oil in each of the two oiler cups on the side of the blower motor.

Operate boiler relief valve

1.Before proceeding, verify that the relief valve outlet has been piped to a safe place of discharge, avoiding any possibility of scalding from hot water.

Weil-mclain Uo-3e High-limit-control User's Manual Pdf

To avoid water damage or scalding due to valve operation, a metal discharge line must be connected to relief valve outlet and run to a safe place of disposal. This discharge line must be installed by a qualifed heating installer or service technician in accordance with the instructions in the GV90+ Boiler Manual. The discharge line must be terminated so as to eliminate possibility of severe burns should the valve discharge.

2.Read the boiler pressure/temperature gauge to make sure the system is pressurized.

3.Lift the relief valve top lever slightly, allowing water to relieve through the valve and discharge piping.

4.If water flows freely, release the lever and allow the valve to seat. Watch the end of the relief valve discharge pipe to ensure that the valve does not weep after the line has had time to drain. If the valve weeps, lift the seat again to attempt to clean the valve seat. If the valve continues to weep afterwards, contact your qualified service technician to inspect the valve and system.

5.If water does not flow from the valve when you lift the lever completely, the valve or discharge line may be blocked. Immediately shutdown the boiler, following the lighting instructions on the inside jacket top. Call your qualified service technician to inspect the boiler and system.

Follow boiler shutdown procedure

1.Follow “TO TURN OFF GAS TO APPLIANCE” on the Operating instruction on the inside of the jacket top panel.You will also find these instructions on page 12 of this manual.

2.Do not drain system unless exposure to freezing temperatures will occur.

3.Do not drain the system if it is filled with an antifreeze solution.

4.Do not shut down boilers used for domestic water heating. They must operate year-round.

GV90+ gas-fired water boiler — User’s Information Manual

How it works . . .

1Integrated boiler control

The integrated boiler control (IBC) responds to signals from the room thermostat, air pressure switch, inlet water sensor and boiler limit circuit to operate the circulators, gas valve, igniter and blower. When a room thermostat calls for heat, the IBC starts the system circulator and blower.

The IBC runs the blower to purge the boiler flue passages, then turns on the igniter and lets it warm up.

After igniter warm-up, the IBC opens the gas valve, turns the igniter off, and checks for flame. The flame must come on within 4 seconds or the IBC will shut down and try the full cycle again.

When the room thermostat is satisfied, the IBC turns off the boiler components and waits for the next heat call.

The IBC indicator lights show normal sequence when the lights are on steady. When a problem occurs, the IBC flashes combinations of lights which indicate the most likely reason for the problem.

2Transformer

The control transformer reduces line voltage to 24 volts for the gas valve and limit circuit.

3Blower

The blower pulls in air and mixes it with gas from the gas valve. The blower forces this mixture into the burner for combustion inside the boiler chamber.

4Recuperator

The recuperator is a stainless steel heat exchanger that increases boiler efficiency by extracting additional heat from the flue gases. Return water passes through the recuperator before entering the boiler.

5Water temperature limit switch

The water temperature limit switch turns off the gas valve if the temperature in the boiler goes above its setting. (The circulators will continue to run as long as there is a call for heat.)

6System circulator

The system circulator circulates water through the external (system) piping. The flow rate of the circulator is controlled by the IBC, depending on the temperature of the water entering the boiler sections. Pump must remain on boiler — do not remove.

7Bypass circulator

The IBC operates the bypass circulator to mix hot water from the boiler outlet with colder return water from the system as needed to prevent condensation of flue gases in the cast iron heat exchanger.

When the water returning to the boiler is below 140°F, the IBC regulates the bypass circulator and system circulator flow rates to raise the return water temperature up to 140°F before it enters the cast iron sections. By balancing these flow rates, the IBC can protect against condensation even if return water is as low as 60°F.

Pump must remain on boiler — do not remove.

8Air pressure switch

The air pressure switch signals the IBC, telling the control whether air is moving through the blower.

9Water temperature sensor

The water temperature sensor monitors the temperature of the water entering the boiler sections. The sensor sends this information to the IBC. The IBC determines how much to adjust the circulator flow rates to provide at least 140°F water to the cast iron heat exchanger.

10

LEGEND

aSupply to system, 1” NPT

bReturn from system, 1” NPT

cCombustion air inlet fitting — 3” PVC connection

dFlue outlet — 3”PVC connection

eGas valve — negative pressure regulated gas control

fPressure/temperature gauge

Weil-mclain Uo-3e High-limit-control User's Manual Instructions

gFlueway inspection port cover

hSensor hose trap

iManual air vent

jRelief valve

kThermal fuse — a one-time fuse device that shuts boiler off if flue temperature exceeds its setpoint

mCondensate trap line — shipped loose with boiler, field installed

nCondensate drain connection — ½” PVC female

This boiler uses a negative-pressure- regulated gas valve, set for an outlet pressure approximately –0.20” water column.

DO NOT set the outlet pressure higher than factory setting.

Part number 550-142-055/0411

GV90+ gas-fired water boiler — User’s Information Manual

GV90+ Water Boiler

GV90+ gas-fired water boiler — User’s Information Manual

Operating instructions

Before attempting to start the boiler, check the boiler pressure temperature gauge. If boiler and system are full of water and properly pressurized, the gauge should read at least 12 psig on most systems. Operating the boiler without proper water content will damage boiler and controls and could result in severe personal injury, death or substantial property damage.

Figure 5 Operating instructions

GV90+ gas-fired water boiler — User’s Information Manual

Common problems and solutions

GV90+ gas-fired water boiler — User’s Information Manual

Common problems and solutions (continued)

GV90+ gas-fired water boiler — User’s Information Manual

Weil-mclain Uo-3e High-limit-control User's Manual 2017

NOTES

GV90+ gas-fired water boiler — User’s Information Manual