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RESIDENTIAL ELECTRIC AND LIGHT DUTY
COMMERCIAL ELECTRIC WATER HEATERS
SERVICE
MANUAL
Troubleshooting Guide and Instructions for Service
(To be performed ONLY by qualified service providers)
Models Covered by This Manual:
Residential Energy Saver:
M1& M2(HE) UprightModels.
M1& M2 Lowboy Models.
M1& M2 UtilityModels.
M1& M2 Wall HungModels.
Light DutyEnergy Saver:
LD Upright Models.
LD Utility Models.
LD Lowboy.
LD WallHung.
Dairy Barn Deluxe Energy Saver:
DB Models.
Photo is of
M-2-50T6DS
Manual 238-47104-00A Save this manual for future reference
2
Residential and Light Duty
Commercial Electric Water Heaters
Table of Contents
Page Service Procedure
Introduction ………………………………………………………………………. 2
Tools……………………………………………………………………………… 2
General Information ……………………………………………………………… 3
Sequence of Operation …………………………………………………………… 6
Single Element Operation ……………………………………................... 6
Double Element, Non-Simultaneous, Single Phase………………………. 7
Double Element, Simultaneous, Single Phase, 4 wire Service …............... 8
Double Element, Non-Simultaneous, 3 Phase ………................................ 9
Double Element, Simultaneous, 3 Phase ………………………………… 10
Double Element, Non-Simultaneous, Single Phase, Off Peak …………... 11
Troubleshooting …………………………………………………………………. 12
Line Voltage and High Limit ECO Testing……………………………………… 14
Heating Element Testing ……………................................................................... 15
Residential Thermostat Testing ……..................................................................... 16
Single Element ……………………………............................................... 16
Double Element, Non-Simultaneous, Single Phase ………....................... 17
Double Element, Non-Simultaneous, 3 Phase …………………………... 19
Double Element, Simultaneous, 3 Phase ………………………………... 21
Double Element, Non-Simultaneous, Single Phase, Off Peak ………….. 23
Light Duty Commercial Thermostat Testing …..................................................... 25
Double Element, Non-Simultaneous, Single Phase ……………………... 25
Double Element, Simultaneous, Single Phase …………………………... 27
Double Element, Simultaneous, 3 Phase ………………………………... 31
RE IV
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
RE-I
RE-II
RE-III
Thermostat Removal and Replacement …………………………………………. 33
Heating Element Removal and Replacement ……………………………………. 34
Dip Tube and Anode Inspection and Replacement ……………………………… 35
RE-V
RE-VI
RE-VII
Generic Parts List ………………………………………………………………... 36 - - -
Introduction
This service manual is designed to aid service and maintenance professionals on the function, proper diagnosis and repair of
Bradford White residential electric and light duty commercial electric water heaters.
The text and illustrations in this manual provide step by step instructions to facilitate proper operation and troubleshooting procedures. Contact the Bradford White Technical Support Group immediately if diagnosis can not be made using the methods described in this service manual.
- Multi Meter.
- 1-½ Deep Well Socket (element removal).
- ¼" Nut Driver.
Tools
- Phillips Head Screw Driver.
- Thermometer.
- Drain Hose.
- Various Hand Tools: Pipe Wrench, Channel Locks, Pliers (common & needle nose), Wire cutters, Wire Strippers,
Flash Light.
Page 2
GENERAL INFORMATION
Commonly Used Formulas
Amps = Watts (for single phase units) Example 4500W/240V = 18.75A
Volts
Amps = Watts (for balanced 3 phase units) Example 4500W/240V x 1.732 = 10.82A
Volts x 1.732
Watts = Amps x Volts Example 18.75A x 240V = 4500W
Ohms = Volts Example (240V) / 4500W = 12.8 Ohms
Watts
2
2
Common Service Wire Configurations
120 VOLT 240 VOLT
BLACK
Ungrounded
WHITE
Grounded
(Neutral)
BLACK
Ungrounded
120
120
0 240
120
120
Neutral
208 3Ph
A B
120
120
120
208
208
208
C
RED BLACK RED
Neutral
240 3Ph
A B
120
120
120
240
240
240
C
RED BLACK RED
Page 3
480 3Ph/277 1 Ph
Neutral A B C
277
277
277
480
480
480
RED BLACK RED
3
4
Wattage Limitations at Various Voltages
Residential Electric Upright M1 & M2 Series (Non-Simultaneous operation)
Residential High Efficiency Upright M2HE Series (Non-Simultaneous operation)
Residential Electric Lowboy M1 & M2 Series (Non-Simultaneous Operation)
Dairy Barn Deluxe DB Series (Non-Simultaneous Operation)
Voltage Maximum
Wattage
3,000
6,000
Element
Upper/Lower
3 , 0 0 0 / 3 , 0 0 0
6,000/6,000
1 2 0
208, 240
6,000 6,000/6,000 277, 480
Residential Electric Upright M1 & M2 Series (Simultaneous Operation)
Residential High Efficiency Upright M2HE Series (Simultaneous Operation)
Residential Electric Lowboy M1 & M2 Series (Simultaneous Operation)
Light Duty Commercial Electric LD Series (Non-Simultaneous Operation)
Light Duty Commercial Electric LD Series (Simultaneous Operation)
Dairy Barn Deluxe DB Series (Simultaneous Operation)
Voltage Maximum
Wattage
3,000
10,000
11,000
12,000
Element
Upper/Lower
1 , 5 0 0 / 1 , 5 0 0
5 , 0 0 0 / 5 , 0 0 0
5 , 5 0 0 / 5 , 5 0 0
6,000/6,000
1 2 0
2 0 8
2 4 0
277, 480
GENERAL INFORMATION
Residential Electric Utility Series (Single Element Operation)
Light Duty Utility Series (Single Element Operation)
Voltage Maximum
Wattage
3,000
6,000
6,000
6,000
Single
Element
3 , 0 0 0
6 , 0 0 0
6 , 0 0 0
6 , 0 0 0
1 2 0
2 0 8 , 2 4 0
2 7 7
4 8 0
Page 4
GENERAL INFORMATION
Surface Mounted Thermostats
Surface mounted thermostats are mounted into a bracket which holds the thermostat against the side of the tank.
Surface mounted thermostats respond to tank surface temperatures to sense a call for heat, set point temperature settings and high limit (ECO) activation. It is import that the entire back surface of the thermostat is in full contact or flush with the tank. Improperly mounted thermostat will lead to improper heater operation.
Manual
ECO (high limit)
Reset button
Temperature control Dial
Temperature control Dial
Surface Mount
Combination Thermostat/
ECO (high limit)
89T Series
Surface Mount
Combination Thermostat/
ECO (high limit)
89T Series
Direct Immersion “Screw-in” Type Heating Element
Surface Mount
Thermostat
59T Series
1-½ Hex
Screw-in Flange
Terminal Block
Zinc Plated Copper or
Incoloy Sheath
Terminal Block
Screw
Element Rating Ink Stamped on side of Terminal Block.
Page 5
5
6
SEQUENCE OF OPERATION
Residential and light duty commercial electric water heaters are designed to operate using several different operating modes. The common modes and sequence of operation are as follows:
1. Single Element Operation.
2. Double Element Non-Simultaneous Operation (single phase).
3. Double Element Non-Simultaneous Operation (3 phase).
4. Double Element Simultaneous Operation (single phase).
5. Double Element Simultaneous Operation (3 phase).
Sequence of Operation- Single Element Operation.
1 Line voltage is applied across terminals
L1 &L3 of the thermostat. ECO is closed, so there is voltage at terminal L4 and to one side of the element.
1
ECO
Closed
2 Tank is cold therefore thermostat is closed at terminal T2 (calling for heat).
This completes the circuit and allows current to flow through the element.
Thermostat closed at terminal T2
2
3 When the thermostat is satisfied, it opens at terminal T2 interrupting current flow through the element. System is now in stand-by mode, waiting for the next call for heat.
Thermostat opens at terminal T2
3
Page 6
SEQUENCE OF OPERATION
Non-Simultaneous and Simultaneous Operation
Double element electric water heaters are designed to operate in a Non-Simultaneous or Simultaneous mode.
Non-Simultaneous Mode: Allows only one heating element to operate at a time. For example, when the tank is cold, the upper element is energized first, heating the top of the tank. Only when the upper thermostat is satisfied, the upper element is de-energized and power is directed to the lower thermostat, energizing the lower element and heating the bottom portion of the tank until the lower thermostat is satisfied. As hot water is drawn off the tank, it is replaced with cold water delivered through the dip tube to the bottom of the tank. The bottom of the tank cools, the lower thermostat will call for heat energizing the lower element. If enough hot water is drawn from the tank, the top portion of the tank cools and the upper thermostat will call for heat, de-energizing the lower element and allowing only the top element to energize until the upper thermostat is satisfied.
Sequence of Operation- Double Element, Non-Simultaneous Operation, Single Phase.
3
4
1
2
Line voltage is applied across terminals
L1 & L3 of the upper thermostat. ECO is closed, so there is voltage at terminal L4 and to one side of the upper and lower elements.
Tank is cold therefore both thermostats are closed at terminal T2 & 2 (calling for heat). The circuit is complete through the upper thermostat only, allowing current to flow through upper element.
When upper thermostat is satisfied, it opens at terminal T2 interrupting current flow through upper element, and closes at terminal T4 allowing voltage to pass to terminal 1 of lower thermostat. This completes the circuit through the lower thermostat and allows current flow through lower element.
When the lower thermostat is satisfied, it opens at terminal 2 interrupting current flow through lower element. The system is now in stand-by mode waiting for the next call for heat
1
Upper
T’stat
Upper
Element
Lower
T’stat
Lower
Element
ECO
Closed Thermostat closed at terminal T2
Thermostat closed at terminal 2
5 The lower thermostat/element combination will generally cycle on and off more often then the upper. In some cases, such as a cold tank or in high demand periods, the upper thermostat will call for heat
(opening at terminal
Thermostat closed at terminal T4 T4 and closing at terminal T2) prior to the lower thermostat being satisfied. This will interrupt current flow through the lower thermostat and element and allow current to flow through the upper element only. When the upper thermostat is satisfied, it resumes operation as described in sequence #3 above.
3
Upper
T’stat
Upper
Element
Lower
T’stat
Lower
Element
Thermostat open between terminals
1 and 2
4
Upper
T’stat
Upper
Element
Lower
T’stat
Lower
Element
Thermostat closed at terminal T2
Thermostat closed between terminals
1 and 2
2
Upper
T’stat
Upper
Element
Lower
T’stat
Lower
Element
5
Upper
T’stat
Upper
Element
Lower
T’stat
Lower
Element
Page 7
7
8
SEQUENCE OF OPERATION
A 4 wire, double element heater wired for simultaneous operation is essentially two single element systems operating independently. The heaters are wired internally with two independent circuits, one circuit for each thermostat/element combination. When installed using a two wire service, the blue and red (or white) wires will be connected together, likewise black and yellow wires will be connected together.
Sequence of Operation- Double Element, Simultaneous Operation, Single Phase, 4 wire service installation.
Circuit two Circuit two
Circuit one
1
Circuit one
2
1
2
Line voltage from circuit one is applied across terminals L1 & L3 of the lower thermostat. Likewise, line voltage from circuit two is applied across terminals L1 &
L3 of the upper thermostat. ECO in both upper and lower thermostat is closed, so there is voltage at terminal L4 of each thermostat and to one side of the upper and lower elements.
Tank is cold therefore both thermostats are closed at terminal T2 (calling for heat).
This completes the circuit through the thermostats and allows current to flow through the elements.
ECO
Closed
ECO
Closed
Thermostat closed at terminal T2
Thermostat closed at terminal T2
3 When either thermostat is satisfied, it will open at terminal T2, interrupting current flow through the corresponding element. As both thermostats satisfy, the system will be in stand-by mode waiting for the next call for heat. Thermostats will operate independent of the other.
Circuit one
3
Thermostat open at terminal T2
Circuit two
Thermostat open at terminal T2
Page 8
SEQUENCE OF OPERATION
Sequence of Operation- Double Element, Non-Simultaneous Operation, 3 Phase.
1
1
4
2
3
Line voltage is applied across terminals L1
& L3 of upper thermostat. Likewise, Line voltage is applied to terminal L3 of lower thermostat. ECO in both upper & lower thermostat is closed, so there is voltage at terminal L4 of both thermostats and to one side of both upper & lower elements.
Tank is cold therefore both thermostats are closed at terminal T2 (calling for heat).
The circuit is complete through the upper thermostat only allowing current to flow through the upper element.
When the upper thermostat is satisfied, it opens at terminal T2 interrupting current flow through upper element, and closes at terminal T4 allowing voltage to pass to terminal L1 of lower thermostat. This completes the circuit through the lower thermostat allowing current flow through lower element.
When the lower thermostat is satisfied, it opens at terminal T2 interrupting the current flow through the lower element. The system is now in stand-by mode waiting for the next call for heat.
Thermostat closed at terminal T4
3
ECO
Closed
ECO
Closed
Thermostat closed at terminal T2
5 The lower thermostat/element combination will generally cycle on and off more often then the upper. In some cases, such as a cold tank or in high demand periods, the upper thermostat will call for heat (opening at terminal T4 and closing at terminal T2) prior to the lower thermostat being satisfied.
This will interrupt current flow through the lower thermostat and element and allow current to flow through the upper element only. When the upper thermostat is satisfied, it resumes operation as described in sequence #3 above.
Thermostat closed at terminal T2
5
Thermostat closed at terminal T2
Thermostat closed at terminal T2
Thermostat closed at terminal T4
Thermostat open at terminal T2
2
4
Thermostat closed at terminal T2
Page 9
9
10
SEQUENCE OF OPERATION
Sequence of Operation- Double Element, Simultaneous Operation, 3 Phase.
1 1
2
Line voltage is applied across terminals L1
& L3 of upper thermostat. Line voltage also extends to terminal L1 of lower thermostat.
Also, line voltage is applied to terminal L3 of lower thermostat. ECO in both upper & lower thermostat is closed, so there is voltage at terminal L4 of both thermostats and to one side of both upper & lower elements.
Tank is cold therefore both thermostats are closed at terminal T2 (calling for heat).
This completes the circuit through the thermostats and allows current to flow through the elements.
ECO
Closed
ECO
Closed
Thermostat closed at terminal T2
Thermostat closed at terminal T2
2
3 When either thermostat is satisfied, it will open at terminal T2, interrupting current flow through the corresponding element. As both thermostats satisfy, the system will be in stand-by mode waiting for the next call for heat. Thermostats will operate independent of the other.
Thermostat open at terminal T2
Thermostat open at terminal T2
3
Page 10
SEQUENCE OF OPERATION
Some electric utility companies will offer discounts for using electricity during “Off Peak” Times of the day. The system allows the use of an “Off Peak” meter, which interrupts power to the lower element during high power demand periods.
Sequence of Operation- Double Element, Non-Simultaneous Operation, Single Phase, Off Peak.
1
2
Line voltage is applied across terminals
L1 & L3 of the upper thermostat. Line voltage from off peak meter is supplied to terminal L1 of lower thermostat. ECO in the upper thermostat is closed, so there is voltage at terminal L4 of upper thermostat and to one side of the upper element.
Tank is cold therefore both thermostats are closed at terminal T2 (calling for heat). The circuit is complete through the upper thermostat only, allowing current to flow through upper element.
From
Off Peak
Meter
3
4
When upper thermostat is satisfied, it opens at terminal T2 interrupting current flow through upper element, and closes at terminal T4 allowing voltage to pass to one side of the lower element. This completes the circuit through the lower thermostat and off peak meter allowing current flow through lower element.
When the lower thermostat is satisfied, it opens at terminal T2 interrupting current flow through lower element. The system is now in stand-by mode waiting for the next call for heat
5 During peak power demand periods as determined by the local utility, the off peak meter will interrupt power to terminal L1 of lower thermostat. Only the top thermostat/element combination is allowed to operate during this period.
From
Off Peak
Meter
3 4
1
ECO
Closed
Thermostat closed at terminal T2
Thermostat closed at terminal T2
Off Peak
Power interrupted
2
5
Thermostat closed at terminal T4
Thermostat closed at terminal T2
Thermostat closed at terminal T2
Thermostat open at terminal T2
Page 11
11
12
TROUBLESHOOTING
Most common cause for improper electric water heater operation can be linked to heating element failure.
When troubleshooting an electric water heater with the incidence of “No Hot Water” or “Insufficient Amount of Hot
Water” Its always a good idea to check the heating elements first following the procedure on page 15.
Common Heating Element Failures Are:
1.
Dry Firing. Element may be partially submerged in water or most likely, completely exposed with no water in
tank. In some cases sediment or lime build up around an element can eventually cause an air pocket, and
within seconds, result in a dry fired element. At this point the element becomes inoperative. When element
replacement is required, be sure tank is full of water prior to energizing the water heater.
2.
Grounded Element. An element with a short circuit to ground will in most cases cause the circuit breaker in
the service panel to open or shut off. In some cases there may not be enough current draw for the circuit
breaker to open. This will allow the heating element to be in continuous operation resulting in over heated
water, limited only by the ECO or Energy Cut Off located in the thermostat. Repeated actuation of the ECO
reset button on the thermostat usually is the result of a grounded element.
3.
Sediment build up. Slow hot water recovery can usually be traced back to sediment or lime build up around
heating element. Sediment build up can also over time cause a dry fired element.
Illustration 1, below shows a common “Screw-In” type heating element identifying certain features commonly referred to throughout this manual.
1-½ Hex
Screw-in Flange
Terminal Block
Zinc Plated Copper or
Incoloy Sheath
Terminal Block
Screw
Element Rating Ink Stamped on side of Terminal Block.
Illustration 1
Typical Direct Immersion “Screw-In”
Type Heating Element
Page 12
TROUBLESHOOTING
Quick Step Plan to Hot Water
1. TURN OFF power to water heater and check all wire
connections to insure they are tight and corrosion free.
2. Turn power “ON” and determine that service voltage is
present, and the high limit (ECO) has not actuated
(see procedure on page 14).
3. Check for inoperative heating element (see procedure on page 15).
WARNING
High voltage exposure. Use caution when making voltage checks to avoid personal injury.
4. Check for proper thermostat operation (see procedures beginning on page 16). NOTE: Thermostat testing procedures
assume items 2 and 3 above are in working order.
SYMPTOM
No Hot Water
Not Enough Hot
Water
Slow Hot Water
Recovery
Over Heated
Water or
Continues
Operation
PROBABLE CAUSE
1. No Power to heater.
2. Loose wire connections.
3. Inoperative upper heating element.
4. Inoperative upper thermostat.
5. Open ECO.
1. Inoperative lower heating element.
2. Thermostat(s) set to low.
3. Inoperative thermostat(s).
4. Loose wire connection.
5. Sediment or lime build up on element(s).
6. High demand period.
7. Undersized heater.
8. Very cold inlet water to heater.
9. Plumbing connections reversed.
10. Damaged dip tube.
1. Sediment or lime build up on element(s).
2. Loose wire connections.
3. Inoperative thermostat(s).
4. Derated heating element installed.
1. Thermostat not in contact with tank.
2. Grounded heating element(s).
3. Thermostat set to high.
4. Inoperative thermostat(s).
5. Inoperative ECO.
6. Undersized water heater.
CORRECTIVE ACTION
SERVICE
PROCEDURE
1. Check fuses or circuit breakers in service
panel.
2. Check all wire connections.
3. Check heating element(s). Replace as
needed.
4. Check thermostat(s) operation. Replace as
needed.
5. Check ECO. Reset or replace
thermostat(s) as needed.
1. Check heating element(s), replace as
needed.
2. Increase thermostat setting.
3. Check thermostat(s), replace as needed.
4. Check all wire connection.
5. Remove heating element(s) and check for
lime build up.
6. Reduce demand.
7. Replace with larger heater.
8. Temper water to heater.
9. Correct plumbing connections.
10. Check dip tube, replace as needed.
1. Remove heating element(s) and check for
lime build up.
2. Check all wire connections.
3. Check thermostat(s), replace as needed.
4. Check terminal block of element for proper
voltage and wattage rating.
1. Position thermostat flush with tank surface.
2. Check heating element(s). Replace as
needed.
3. Adjust thermostat(s) to desired setting.
4. Check thermostat(s), replace as needed.
5. Check ECO, replace thermostat as
needed.
6. Replace with larger heater.
3. See Service Procedure
RE-II, Page 15.
4. See Service Procedure
RE-III, Page 16.
5. See Service Procedure
RE-I, Page 14.
1. See Service Procedure
RE-II, Page 15.
3. See Service Procedure
RE-III, Page 16.
5. See Service Procedure
RE-VI, Page 34.
10. See Service Procedure
RE-VII, Page 35.
1. See Service Procedure
RE-VI, Page 34.
3. See Service Procedure
RE-III, Page 16.
1. See Service Procedure
RE-V, Page 33.
2. See Service Procedure
RE-II, Page 15.
4. See Service Procedure
RE-III, Page 16.
5. See Service Procedure
RE-I, Page 14.
Noisy (singing or hissing) Elements
1. Lime formation on elements.
1. Remove and clean heating elements.
Replace as needed.
1. See Service Procedure
RE-VI, Page 34.
Page 13
13
14
SERVICE PROCEDURE RE-I
Line Voltage & High Limit (ECO)
Testing
Line Voltage Testing WARNING
High voltage exposure. Use caution when making voltage checks to avoid personal injury.
1. Turn “OFF” power to water heater.
2. Remove access cover(s) from front of water
heater. Remove insulation and plastic cover
from thermostat.
3. Set multi-meter to volts AC.
4. Turn power “ON” to water heater.
5. Check voltage across terminals L1 & L3
of upper thermostat (see illustration 2).
A) Rated voltage IS present, power to the water
heater is okay.
B) Rated voltage NOT present, Check circuit breaker
at service panel.
Illustration 2
ECO reset button
Illustration 3
High Limit (ECO) Testing
1. Check voltage across terminals L1 & L4 upper thermostat (see illustration 3).
A) Rated Voltage IS present, ECO is okay.
B) Rated voltage NOT present, proceed to step 2.
2. Turn power “OFF” to water heater and firmly press ECO reset button on thermostat(s). Turn power “ON” and recheck
voltage across terminals L1 & L4 of upper thermostat
(see illustration 3).
A) Rated voltage IS present, the ECO has opened indicating the water in the tank is or has over heater.
Check the following:
1. Thermostat must be in full contact with tank.
2. Be sure heating element(s) is not shorted to ground (see page 15).
3. Proper thermostat operation (see procedures beginning on page 16).
B) Rated voltage NOT present, water in tank may be over heated.
1. If water is hot, turn “OFF” power to water heater and flow water through tank to cool below set point
of upper thermostat. Recheck voltage per step 1.
2. If water is cool, Replace upper thermostat.
Page 14
SERVICE PROCEDURE RE-II
Heating Element Testing
Testing For Open Or Burned Out Element.
Step 1.
TURN OFF POWER TO WATER HEATER.
Step 2. Remove access cover(s) from front of water heater. Remove insulation and plastic cover from thermostat.
Step 3. Disconnect wires from heating element.
Step 4. Set multi-meter to “ohms” setting.
Step 5. Touch probes of multi-meter to screw terminals of heating element
(see illustration 4).
Step 6. Reading should be 12.8 ohms (±6%) for a 240 volt, 4500 watt element:
Ohms = Volts
Watts
2
A reading outside the range using the formula above (±6%), indicates a bad element and the element must be replaced.
WARNING
High voltage exposure. Be sure power is turned
OFF to water heater prior to performing this procedure.
Meter Probe
Element Screw Terminals
Illustration 4
Testing For Heating Element Short Circuit To
Ground.
Step 1.
TURN OFF POWER TO WATER HEATER.
Step 2. Remove access cover(s) from front of water heater. Remove insulation and plastic cover from thermostat.
Step 3. Disconnect wires from heating element.
Step 4. Set multi-meter to “ohms” setting.
Step 5. Touch one probe of multi-meter to either screw terminal of heating element and the other on the element flange (see illustration 5). There should be no reading on the ohm meter. Any reading indicates a grounded element and the element must be replaced. Repeat this step for the other screw terminal.
Element Screw Terminal
Meter Probe
Element Flange
Illustration 5
Page 15
15
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Single Element Operation or
Double Element, 4 Wire, Simultaneous, Single Phase
Operation.
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Water In Tank Is Cold With Power ON.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
A) Rated voltage NOT present,
thermostat to element.
Illustration 6 Illustration 7
16
Water Temperature In Tank Is Above Thermostat Setting.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
Page 16
Reference 4 Wire, Simultaneous, Single Phase
Wiring diagram.
NOTE: Wiring consists of two single element configurations operating independently.
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous, Single Phase
Operation.
Water In Tank Is Cold With Power ON.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of
upper thermostat (see illustration 8).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across element terminals
(see illustration 9).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing
see page 15.
Illustration 8
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 9
Tank Does Not Deliver Enough Hot Water.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
B) Rated voltage NOT present, replace upper thermostat.
A) Rated voltage NOT present, replace upper thermostat.
B) Rated voltage IS present, thermostat is okay. Go to step 7 on next page.
Illustration 10
Page 17
17
18
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous, Single Phase
Operation (continued).
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Not Enough Hot Water (continued).
7. Check voltage across terminal L4 of upper
thermostat and terminal 1 of lower thermostat
(see illustration 11).
A) Rated voltage NOT present,
- check wire connection between thermostats.
B) Rated voltage IS present, okay, go to step 8.
8. Adjust lower thermostat to highest setting. Water temperature in
tank must be below the lower thermostat setting for this test.
9. Check voltage across terminal L4 of upper
thermostat and terminal 2 of lower thermostat (see illustration 12).
A) Rated voltage NOT present, replace lower thermostat.
B) Rated voltage IS present, thermostat is ok.
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 11
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes Line voltage, ECO and elements are in working
order.
2. Adjust upper and lower thermostats to the lowest setting.
3. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of upper thermostat
(see illustration 8 on page 17).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay. Go to step
5 below.
C) Lower than rated voltage IS present, recheck for grounded upper
element (see page 15).
5. Check across terminals L4 and 2 of lower thermostat (see illustration 12).
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, lower thermostat is okay.
C) Lower than rated voltage IS present, recheck for grounded lower
element (see page 15).
Page 18
Illustration 12
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous, Three Phase
Operation.
Water In Tank Is Cold With Power ON.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of
upper thermostat (see illustration 13).
A) Rated voltage NOT present,
Recheck ECO. If ECO is okay,
replace thermostat.
B) Rated voltage IS present,
proceed to next step.
5. Check across element terminals
(see illustration 14).
A) Rated voltage NOT present,
check wire connections from
thermostat to element.
B) Rated voltage IS present,
Repeat element testing,
see page 15.
Illustration 13
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 14
Tank Does Not Deliver Enough Hot Water.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”
B) Rated voltage NOT present, replace upper thermostat.
5. Adjust temperature setting of upper thermostat to the minimum setting.
Water temperature in tank must be above thermostat setting for this test.
A) Rated voltage NOT present, replace upper thermostat.
Page 19
Illustration 15
19
20
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous,
Three Phase Operation (continued).
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Tank Does Not Deliver Enough Hot Water (continued)
7. Check voltage across terminal L1 & L3 of lower thermostat (see illustration 16).
A) Rated voltage NOT present, check wire connection between thermostats.
B) Rated voltage is present, okay, go to step 8.
8. Adjust lower thermostat to highest setting. Water temperature in tank must be below
the lower thermostat setting for this test.
9. Check voltage across terminal L4 & T2 of lower thermostat (see illustration 17).
A) Rated voltage NOT present, recheck ECO (see page 14). If ECO okay,
replace lower thermostat.
B) Rated voltage IS present, thermostat is ok. Check wire connection to lower
element. If connection okay, recheck lower element (see page 15).
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 16
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes Line voltage, ECO and elements are in working
order.
2. Adjust upper and lower thermostats to the lowest setting.
3. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of upper thermostat
(see illustration 13 on page 19).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay. Go to step
5 below.
C) Lower than rated voltage IS present, recheck for grounded upper element (see page 15).
5. Check across terminals L4 and T2 of lower thermostat (see illustration 17).
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, lower thermostat is okay.
C) Lower than rated voltage IS present, recheck for grounded lower element (see page 15).
Illustration 17
Page 20
Double Element, Simultaneous, Three Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
2. Adjust temperature setting for both
thermostats to the highest setting.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
Recheck ECO (see page 14).
thermostat.
Illustration 18
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 19
Repeat element testing
see page 15.
B) Rated voltage IS present,
proceed to next step.
8. Check across lower element terminals.
A) Rated voltage NOT present,
thermostat to element.
Illustration 20 Illustration 21
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Page 21
21
22
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Simultaneous, Three Phase
Operation (continued).
Water Temperature In Tank Is Above Thermostat
Setting.
1. This procedure assumes Line voltage, ECO and
elements are in working order.
2. Adjust upper and lower thermostat to the lowest setting.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”.
5. Check across terminals L4 and T2 of
upper thermostat (see illustration 22).
A) Rated voltage IS present,
replace upper thermostat.
B) Rated voltage NOT present,
upper thermostat is okay. Go to step 6 below.
C) Lower than rated voltage IS present,
recheck for grounded upper element
(see page 15).
6. Check across terminals L4 and T2 of
lower thermostat (see illustration 23).
A) Rated voltage IS present,
replace lower thermostat.
B) Rated voltage NOT present,
lower thermostat is okay.
C) Lower than rated voltage IS present,
recheck for grounded lower element
(see page 15).
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 22
Illustration 23
Page 22
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
Double Element, Non-Simultaneous, Single Phase,
Off Peak Operation.
Water In Tank Is Cold With Power ON.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
B) Rated voltage IS present,
see page 15.
Illustration 24
Tank Does Not Deliver Enough Hot Water.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
3. Adjust temperature setting of upper & lower thermostat to the
setting for this test.
B) Rated voltage NOT present, replace upper thermostat.
setting. Water temperature in tank must be above thermostat setting
for this test.
A) Rated voltage NOT present, replace upper thermostat.
Page 23
Illustration 25
Illustration 26
23
24
Double Element, Non-Simultaneous,
Single Phase, Off Peak Operation.
(continued)
N ot Enough Hot Water (continued).
SERVICE PROCEDURE RE-III
Residential Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
B) Rated voltage is present, okay,
go to step 8.
A) Rated voltage NOT present,
thermostats & element.
Repeat element testing
see page 15.
Illustration 27
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 28
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes Line voltage, ECO and elements are in working order.
2. Adjust upper and lower thermostats to the lowest setting.
3. Turn power “ON” to water heater and set multi-meter to “Volts AC”.
4. Check across terminals L4 and T2 of upper thermostat (see illustration 24 on page 23).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay. Go to step 5 below.
C) Lower than rated voltage IS present, recheck for grounded upper element (see page 15).
5. Check across terminals T4 of upper thermostat and T2 of lower thermostat (see illustration 27 above).
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, lower thermostat is okay.
C) Lower than rated voltage IS present, recheck for grounded lower element (see page 15).
Page 24
Double Element, Non-Simultaneous, Single Phase
Operation.
Water In Tank Is Cold With Power ON.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”.
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Recheck ECO (see page 14). If
ECO is okay, replace thermostat.
Illustration 29
Tank Does Not Deliver Enough Hot Water.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”
Highest setting. Water temperature in tank must be below thermostat
setting for this test.
B) Rated voltage NOT present, replace upper thermostat.
A) Rated voltage NOT present, replace upper thermostat.
Page 25
Illustration 30
Illustration 31
25
Double Element, Non-Simultaneous,
Single Phase Operation (continued)
Tank Does Not Deliver Enough Hot
Water (continued).
B) Rated voltage is present, okay,
go to step 8.
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
26
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 32
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes line voltage, ECO and elements are in working order.
2, Adjust upper and lower thermostat to the lowest setting.
3. Turn power “ON” to water heater and Set multi-meter to “Volts AC”
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, okay, go to step 5 below.
C) Lower than rated voltage IS present, recheck for grounded lower
element see page 15.
5. Check across terminal L4 & T2 of upper thermostat (see illustration 34).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay.
Illustration 33
Illustration 34
Page 26
Double Element, Simultaneous, Single Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
Recheck upper ECO
is okay, replace upper thermostat.
6. Check across upper element terminals
(see illustration 36).
Illustration 35
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 36
B) Rated voltage IS present,
proceed to next step.
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 37
Page 27
Illustration 38
27
28
Double Element, Simultaneous, Single Phase
Operation (continued)
Water Temperature In Tank Is Above Thermostat
Setting.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Adjust upper and lower thermostat to the lowest setting.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
5. Check across terminals L4 and T2 of
upper thermostat (see illustration 39).
A) Rated voltage IS present,
replace upper thermostat.
B) Rated voltage NOT present,
upper thermostat is okay. Go to step 6 below.
C) lower than rated voltage IS present,
recheck for grounded upper element
see page 15.
6. Check across terminal L3 of upper thermostat and
T2 of lower thermostat (see illustration 40).
A) Rated voltage IS present,
replace lower thermostat.
B) Rated voltage NOT present,
lower thermostat is okay.
C) lower than rated voltage IS present,
recheck for grounded lower element
see page 15.
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 39
Page 28
Illustration 40
Double Element, Non-Simultaneous, Three Phase
Operation.
Water In Tank Is Cold With Power ON.
2. Turn power “ON” to water heater.
3. Set multi-meter to “Volts AC”
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
B) Rated voltage IS present,
see page 15.
Illustration 41
Tank Does Not Deliver Enough Hot Water.
1. This procedure assumes line voltage, ECO and elements are in
working order.
2. Turn power “ON” to water heater and set multi-meter to “Volts AC”
A) Rated voltage IS present, okay, upper thermostat is calling
for heat. Go to step 5 below.
B) Rated voltage NOT present, replace upper thermostat.
A) Rated voltage NOT present, replace upper thermostat.
Page 29
Illustration 42
Illustration 43
29
Double Element, Non-Simultaneous,
Three Phase Operation (continued).
Tank Does Not Deliver Enough Hot Water
(continued).
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
8. Check voltage across lower element
(see illustration 45).
30
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 44
Water Temperature In Tank Is Above Thermostat Setting.
1. This procedure assumes line voltage, ECO and elements are in working order.
2. Adjust upper and lower thermostat to the lowest setting.
3. Turn power “ON” to water heater and Set multi-meter to “Volts AC”.
A) Rated voltage IS present, replace lower thermostat.
B) Rated voltage NOT present, okay, go to step 5 below.
C) lower than rated voltage IS present, recheck for grounded lower
element.
5. Check across terminal L4 & T2 of upper thermostat (see illustration 46).
A) Rated voltage IS present, replace upper thermostat.
B) Rated voltage NOT present, upper thermostat is okay.
Page 30
Illustration 45
Illustration 46
Double Element, Simultaneous, Three Phase
Operation.
Water In Tank Is Cold Or Not Enough Hot
Water With Power ON.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
A) Rated voltage NOT present,
Recheck upper ECO
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 47 Illustration 48
thermostats. If okay, replace
lower thermostat.
WARNING
Be sure thermostats are reset to their original temperature settings as found prior to thermostat testing
Illustration 49
Page 31
Illustration 50
31
32
SERVICE PROCEDURE RE-IV
Light Duty Commercial
Thermostat Testing
Double Element, Simultaneous, Three Phase
Operation (continued).
Water Temperature In Tank Is Above Thermostat
Setting.
1. This procedure assumes line voltage, ECO and
elements are in working order.
2. Adjust upper and lower thermostat to the lowest setting.
3. Turn power “ON” to water heater.
4. Set multi-meter to “Volts AC”
5. Check across terminals L4 and T2 of
upper thermostat (see illustration 51).
A) Rated voltage IS present,
replace upper thermostat.
B) Rated voltage NOT present,
upper thermostat is okay. Go to step 6 below.
C) lower than rated voltage IS present,
recheck for grounded upper element
see page 15.
6. Check across terminals L4 & T2 of lower thermostat
(see illustration 52).
A) Rated voltage IS present,
replace lower thermostat.
B) Rated voltage NOT present,
lower thermostat is okay.
C) lower than rated voltage IS present,
recheck for grounded lower element.
WARNING
High voltage exposure. Use caution to avoid personal injury during this procedure.
Illustration 51
Page 32
Illustration 52
SERVICE PROCEDURE RE-V
Thermostat Removal and Replacement
Thermostat Removal
1. Turn power “OFF” To water heater.
2. Remove access cover and insulation.
3. Remove plastic thermostat protector from thermostat.
WARNING
High voltage exposure. Be sure power is
“OFF” when performing this procedure.
5. Note thermostat temperature setting for proper setting of new thermostat.
6. Slide thermostat upwards and out of mounting bracket.
Thermostat Replacement
1. Use a stiff brush to remove any debris or loose scale from tank surface where new thermostat will be installed.
completely flat or flush to tank surface. An improperly installed thermostat will cause improper water heater
operation.
4. Set thermostat to the original thermostat setting found on the old thermostat.
5. Re-install plastic thermostat protector.
6. Re-install insulation and access cover.
7. Restore power to water heater and verify proper heater operation.
Tank Surface
Proper Thermostat mounting flush with tank surface
Thermostat
Improper Thermostat mounting.
Thermostat not flush with tank surface
Thermostat mounting bracket
Front View
Thermostat Mounting
Side View
Proper Thermostat
Mounting
Page 33
Side View
Improper Thermostat
Mounting
33
34
SERVICE PROCEDURE RE-VI
Heating Element Removal and Replacement
Heating Element Removal
1. Turn power “OFF” To water heater.
2. Turn off cold water supply to heater. Connect hose to drain
spigot of water heater and route to an open drain. Open
a nearby hot water faucet to vent heater for draining. Open
drain spigot of water heater and allow heater to drain
to a point below the Element(s).
3. Close drain spigot and remove hose.
4. Remove access cover and insulation.
5. Remove plastic thermostat protector from thermostat.
6. Disconnect wires from element terminals.
WARNING
High voltage exposure. Be sure power is
“OFF” when performing this procedure.
WARNING
Heater components and stored water may be
HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury.
8. Be sure to remove old element gasket from the tank. It is not recommended to be re-used.
Heating Element Replacement
3. Clean any debris from element fitting on tank. Lubricate element threads as needed with thread lubricant.
5. Reconnect wires to element, be sure wires are snug and corrosion free. Do not over tighten, doing so may damage
terminal block.
6. Resume water supply to heater, be sure tank is full of water and check for leaks.
7. Re-install plastic thermostat protector.
8. Re-install insulation and access cover.
9. To resume operation, BE SURE TANK IS FULL OF WATER and restore power to water heater. Verify proper heater
Date Code
Element Rating.
Example: (4500 Watt, 240 Volt)
Element Flange
Element Gasket Seated Flat Against
Element Flange Without Rolls or Gaps
Terminal
Block
Manufacturer Identification
Page 34
SERVICE PROCEDURE RE-VII
Dip Tube and Anode Inspection and
Replacement
Dip Tube Inspection and Replacement
WARNING
Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Turn power “OFF” to water heater.
Turn off cold water supply to heater. Connect hose to drain spigot of water heater and route to an open drain.
Open a nearby hot water faucet to vent heater for draining. Open drain spigot of water heater and allow heater to drain to a point below the inlet connection nipple.
Close drain spigot and remove hose.
Disconnect inlet nipple from plumbing system.
With an appropriate wrench, remove inlet nipple/dip tube from the water heater. Use caution not to damage nipple threads.
Visually Inspect inlet nipple/dip tube. Inlet nipple/dip tube should be free of cracks and any blockage.
Hydro-jets located near the bottom of the dip tube should be open and free of any blockage.
Anti-siphon hole located approximately 6" from the bottom of nipple, should be free of any blockage.
Any damage such as cracks, restriction due to deformation or unintentional holes are not field repairable and the inlet nipple/dip tube must be replaced.
Upon completion of inspection or subsequent replacement, reinstall inlet nipple/dip tube into heater. Connect nipple to plumbing system, close spigot and remove drain hose, resume water supply and refill heater with water.
To resume operation, BE SURE TANK IS FULL OF WATER and turn power “ON” to water heater.
Anode Inspection and Replacement
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Turn power “OFF” to water heater.
Turn off cold water supply to heater. Connect hose to drain spigot of water heater and route to an open drain.
Open a nearby hot water faucet to vent heater for draining. Open drain spigot of water heater and allow heater to drain to a point below the outlet connection nipple.
Close drain spigot and remove hose.
Disconnect outlet nipple from plumbing system.
With an appropriate wrench, remove outlet nipple/anode from the water heater. Use caution not to damage nipple threads.
Visually Inspect outlet nipple/anode. Outlet nipple/anode should show signs of depletion, this is normal.
If depletion is ½ of the original anode diameter (original diameter approximately ¾”), replacement is recommended. If any of the steel core of the anode is exposed, replacement is recommended.
Upon completion of inspection or subsequent replacement, reinstall outlet nipple/anode into heater. Connect nipple to plumbing system, close spigot and remove drain hose, resume water supply and refill heater with water.
To resume operation, BE SURE HEATER IS FULL OF WATER and turn power “ON” to water heater.
Page 35
35
Generic Parts List
36
1. T&P Relief Valve
2. Heat Trap Insert (Outlet)
3. Hot Water Outlet/Anode
4. Cover Conduit/Ground
5. Junction Box Cover
6. Heat Trap Insert (Inlet)
7. Cold Water Inlet Dip Tube
8. Thermostat Protector (Large)
9. Thermostat w/High Limit (89T33)
10. Thermostat Mounting Bracket
Page 36
11. Heating Element
12. Element Gasket
13. Access Cover
14. Lower Thermostat Protector (Small)
15. Thermostat (59T)
16. Brass Drain Valve
17. Thermostat w/High Limit (89T13)
18. ASSE Approved Mixing Device
19. Kit Heat Trap
20. Kit Dairy Barn Leg
NOTES
37
38
NOTES
NOTES
39
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www.bradfordwhite.com
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Table of contents
- 12 Introduction
- 12 Tools
- 13 General Information
- 16 Sequence of Operation
- 16 Single Element Operation
- 17 Double Element, Non-Simultaneous, Single Phase
- 18 Double Element, Simultaneous, Single Phase, 4 wire Service
- 19 Double Element, Non-Simultaneous, 3 Phase
- 20 Double Element, Simultaneous, 3 Phase
- 21 Double Element, Non-Simultaneous, Single Phase, Off Peak
- 22 Troubleshooting
- 24 Line Voltage and High Limit ECO Testing
- 25 Heating Element Testing
- 26 Residential Thermostat Testing
- 26 Single Element
- 27 Double Element, Non-Simultaneous, Single Phase
- 29 Double Element, Non-Simultaneous, 3 Phase
- 31 Double Element, Simultaneous, 3 Phase
- 33 Double Element, Non-Simultaneous, Single Phase, Off Peak
- 35 Light Duty Commercial Thermostat Testing
- 35 Double Element, Non-Simultaneous, Single Phase
- 37 Double Element, Simultaneous, Single Phase