Instruction/ maintenance manual of the product 900kW Bradford-White Corp
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Commer cial Electric W ater Heaters 9kW – 900kW Input Models CHP-I&S-01 INST ALLA TION AND SER VICE MANUAL 1 If the inf ormation in this manual is not f ollo w ed exactl y , a f ir e or explosion ma y r esult causing property damage, personal injury or loss of life .
2 CONTENTS Star t-Up Pr ocedur e Filling the W ater Heater . . . . . . . . .22 Start-Up Checks . . . . . . . . . . . . . . .23 Shutdo wn Procedure . . . . . . . . . . . .24 Maintenance T&P Relief V alve . . . . . . . . . . . . . .24 W ater Chemistr y .
3 FIG. 2 F ront Vie w V ertical Squar e Models FIG. 1 Fr ont V iew V er tical Round Models FIG. 3 F ront Vie w Horizontal Models.
T o minimize the possibility of serious personal injury , f ir e or damag e to y our appliance , ne v er violate the follo wing safety rules. 1. Alw a ys keep the ar ea around y our appliance fr ee of combustib le materials, gasoline, and other flammable liquids and v apors.
3. The appliance must be installed so that the electrical components are protected from w ater (dripping, spraying, etc.) during appliance operation and service (replacing of fuses, elements, etc.
Right Side - 6" (15cm) (24" (0.61m) for high kW vertical square models with an additional control panel on right side) Rear - 0" Left Side - 0" F r ont - 36" (0.
7 Maintain minimum specif ied clearances for adequate operation. All installations must allo w suf f icient space for servicing the electrical components, w ater pipe connections, piping and other auxiliary equipment, as well as the appliance. Multiple appliances ma y be installed in a modular w ater heater installation.
Before making an y connections to the cold w ater inlet or hot w ater outlet, insure that all piping is clean and free of material or scale. This can usually be accomplished b y “ blo wing out the pipe. ” Any foreign material or scale entering the w ater heater can adversel y af fect operation and performance.
discharg e! Hydro gen gas can be produced in a hot water system that has not been used for a long period of time (generall y tw o weeks or more). Hydro gen gas is extremel y flammable.
initial operation. Operation of a w ater heater without a completel y f illed tank ma y result in serious damage to the appliance and heating element burn out. 5. The w ater heater should be connected with a separate grounded branch circuit with o ver cur rent protection and disconnect s witch.
The follo wing items are a vailab le as extra cost options. • Electronic lo w w ater cut-off pre vents energizing of the heater w hen it is not f illed with w ater . • Pilot lights – Monitor on-of f cycle of contactors. • Manual limiting switches with indicating lights to permit heater kW input to be manuall y limited as desired.
Each internal pow er circuit is fused for safety . Each po w er circuit to an immersion element is fused at a maximum of 48 amps. P o w er circuits ma y be fused at lo w er cur rent lev els as needed to balance cur rent on three phase units.
This w ater heater uses an immersion thermostat(s) to activ ate magnetic contactors allo wing cur rent to flo w to the immersion heating elements. The standard control system uses one immersion thermostat for each 54kW of electric heating po w er in a water heater .
The maxim um temperatur e setpoint that should be set f or the Immersion Thermostats or pr ogrammed into the Electr onic T emperatur e Contr ol Sequencer is 190 ° F ( 88 ° C) Al wa ys close the electrical control panel door after making a temperature adjustment.
The w ater heater uses an optional adjustable electronic temperature control to pro vide staged ON/OFF control of the electric heating elements. Operation is based on temperature input from an immersion temperature sensor . The sensor is a positi ve coef f icient platinum thermistor .
Once po w er is applied to the temperature controller the displa y will countdo wn from 210 until the displa y reads zero. All outputs are de-energized at this time. This countdo wn process will repeat each time main po w er is inter rupted. T o av oid vie wing this entire countdo wn, press the Select ke y .
Stag e Set P oint Differ ential 1 12 5 ˚ F 2 ˚ F 2 12 3 ˚ F 2 ˚ F 3 12 1 ˚ F 2 ˚ F 4 12 0 ˚ F 2 ˚ F Re-pro g ram the set points and dif ferentials to meet your system hot w ater requirements.
FIG. 21 High W ater T emperatur e Limit Contr ol - Fixed Setting ERROR MESSAGES DISPLA YED BY THE ELECTRONIC TEMPERA TURE CONTROL There are se ven er ror messages that can be displa yed in response to softw are or hardware problems with the boiler ’ s inter nal electronic temperature control.
The high limit contr ol will not r eset until the water temper ature has dr opped belo w the set point of the high limit. r eset multiple times. The source of the problem must be found and cor rected to insure proper operation. The limit control is co vered with an insulation blank et which must be remo ved to push the red reset button.
This w ater heater may be equipped with an optional electronic lo w w ater cut-off installed at the factor y . This lo w water cut-of f device uses a w ater lev el sensing probe located abo ve the heating element installed in the highest point in the storage tank.
electrical input of the w ater heater in the summer months when ground w ater temperatures are w ar mer and full electrical input from the immersion heating elements is not required. The w ater heater may be restored to full input b y mo ving the s witches to the “ ON ” position.
The cold w ater supply m ust be left in the open position when the w ater heater is in use. An alarm bell with silencing switch is a vailab le as an option on this w ater heater . The alarm bell can be used to pro vide an audib le indication of a control sensed malfunction.
6. While the tank is f illing, open the electrical control panel and set the thermostat(s) to the desired w ater temperature. If equipped with multiple thermostats, all individual thermostats may be adjusted to the same temperature set point or they ma y be set a 2 ° F to 4 ° F (1 ˚ C to 2 ˚ C) apart to step the elements on in stages.
4. Close and lock the electrical control panel door . 5. T urn on the main electrical pow er to the w ater heater . 6. T emperature control and contactor operation should be checked b y allo wing the water heater to come up to temperature and shut of f automaticall y .
should be metallic pipe or a high temperature plastic pipe (CPVC, etc.) to insure that hot w ater flo w will not damage the discharge piping from the relief v alve. In hard w ater areas, water treatment should be used to reduce the introduction of minerals to the system.
All gask ets on disassembled clean-out openings m ust be r eplaced with new g askets on r e-assembl y . Gaskets ar e a v ailab le from y our distributor . Scale accumulation in the bottom of the storage tank ma y be remo ved b y tur ning of f main po w er and draining the tank.
27 TROUBLE SHOOTING Checklist Before calling for service, check the following points to see if the cause of trouble can be identif ied and cor rected. Revie wing this checklist ma y eliminate the need of a ser vice call and quickl y restore hot water service.
CP-5M-5/02-Reprinted in U .S.A. Excessi ve w ater pressure is not the most common cause of relief v alve leakage. It is often caused b y a “ closed system. ” A check valve, back flo w pre venter or pressure reducing v alve, in the inlet system will not permit the expanded hot water volume to equalize pressure with the main.
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