Well-mcLain PLUS Series User manual

Drywell and/or O-Ring Replacement
PLUS Indirect Water Heaters
O-Ring Replacement
Kit Part Number: 635-600-150
1. Rubber O-Ring
2. Hex Key Tool
3. Thread Sealant (Loctite 680 - Packet)
Parts List
Ultra PLUS 40/60/80 - GOLD Plus 30/40/60/80 - PLUS 100/120
Drywell Replacement
Kit Part Number: See chart on page 4.
1. Drywell
2. Hex Key Tool
3. Thread Sealant (Loctite 680 - Packet)
Parts List
NOTICE
Indicates a potentially hazardous situation which, if
ignored, can result in serious injury or substantial
property damage.
Indicates special instructions on installation, operation or
maintenance, which are important to equipment but not
related to personal injury hazards.
WARNING
Failure to follow instructions below can result in severe personal injury or damage if ignored.
Instructions are for a qualified installer/service technician.
Read all instructions before proceeding.
Follow instructions in proper order.
Removal of the Drywell
1. Shut off the domestic cold water supply valve to the water heater.
2. Close all isolation valves on the primary piping from the boiler to the water heater.
Open the boiler side drain at the water heater to relieve the outer pressure.
3. Open a hot water faucet within the system to relieve any pressure within the inner tank.
Failure to properly relieve pressure on the outer tank can cause potential damage to the inner tank.
4. Locate the drywell on the tank.
For PLUS Series water heaters the drywell is located under the top lid near the thermostat knob.
For Ultra PLUS and GOLD Plus Series water heaters the drywell is accessible by removing the thermostat
cover plate.
5. Remove the thermostat sensing bulb from the drywell.
6. To remove the hexagon head shape drywell requires a 27mm wrench or socket.
7. To remove the round head shape drywell requires the Hex Key Tool (supplied in kit) and a wrench or socket.
(Refer to Manual for draining)
(Refer to Manual for draining).
Make sure capillary tube is not kinked or damaged. A defective capillary tube can cause
thermostat to fail, resulting in a situation that can result in severe personal injury or death.
IWH-A020-A/0409
WARNING
WARNING
WARNING
NOTICE
WARNING
®

IWH-A020-A/0409
Copper O-Ring Replacement Installation
The copper O-Ring was used on the
Round Head Style drywell only.
For a proper seal of the drywell onto the tank
coupling:
- Ensure the threads of the drywell and the
coupling are clean and free of debris.
- Ensure thread sealant was applied completely
around all drywell heads.
- Ensure the drywell is tightened fully into the
coupling.
- Turn the domestic cold water supply valve back
on (Refer to Manual for refilling) when drywell
installation is complete.
1. Follow the instructions on removal of the drywell. Re-
move the old copper style O-Ring. Ensure the under-
side and threads of the drywell head and the top
surface and threads of the coupling are clean and free
of debris. Remove the old copper O-Ring.
You will not replace the old copper O-Ring.
2. Apply a generous amount of thread sealant (supplied
in kit) completely around all the drywell threads and
re-thread the drywell into the tank coupling.
3. Use the Hex Key Tool (supplied in kit) and a wrench or
socket to tighten the drywell onto the tank coupling.
4. Re-Insert the thermostat-sensing bulb into the drywell.
Ensure the sensing bulb is inserted fully to the bottom
of the drywell.
Make sure capillary tube is not kinked
or damaged. A defective capillary tube
can cause the thermostat to fail, resulting in a situation
that can result in severe personal injury or death.
Make sure capillary tube is not kinked
or damaged. A defective capillary tube
can cause the thermostat to fail, resulting in a situation
that can result in severe personal injury or death.
NOTICE
WARNING
WARNING
Rubber O-Ring Replacement Installation
1. When replacing the rubber type O-Ring ensure the
underside and thread area of the drywell and coupling
is clean of pipe dope and other debris, remove the old
O-Ring.
2. Slide the new O-Ring over the end of the drywell and
seat it properly into the underside groove (not shown)
of the drywell head. (See Fig. 1)
3. Apply a generous amount of thread sealant (supplied
in kit) completely around all the drywell threads and
re-thread the drywell into the tank.
4. Re-Insert the thermostat-sensing bulb into the drywell.
Ensure the sensing bulb is inserted fully to the bottom
of the drywell.
The rubber O-Ring is used on the
"Old Style" Hex Head Style drywell only.
For a proper seal of the drywell onto the tank
coupling:
- Ensure the O-Ring is properly seated in the
drywell head.
- Ensure thread sealant was applied completely
around all drywell heads.
- Ensure the O-Ring is not twisted or pinched
between the drywell head and coupling.
- Ensure the drywell is tightened fully into the
coupling.
- Turn the domestic cold water supply valve back
on (Refer to Manual for refilling) when new
drywell installation is complete.
Make sure capillary tube is not
kinked or damaged. A defective
capillary tube can cause the thermostat to fail, resulting
in a situation that can result in severe personal injury or
death.
WARNING
NOTICE
NOTICE
A rubber or copper O-Ring is NOT required
on the replacement of the drywell.
NOTICE
Replacement Drywell Installation
1. When replacing the drywell ensure the internal
threads of the coupling are clean and free of debris.
2. Apply a generous amount of thread sealant (Loctite
680 supplied in kit) completely around all the drywell
threads and rethread the drywell into the tank coupling.
3. Use a 27 mm wrench or socket to tighten the drywell
onto the tank coupling.
4. Re-insert the thermostat-sensing bulb into the drywell.
Ensure the sensing bulb is inserted fully to the bottom
of the drywell.
5. Re-insert the thermometer-sensing bulb. Ensure the
bulb is inserted a minimum 12 inches into the drywell.
NOTICE
NOTICE
2
NOTICE

IWH-A020-A/0409
(required if replacing
O-ring, not required
if replacing drywell)
(removed, no
longer available)
3

New Drywell Installation
When installing a new drywell do not apply rubber or copper O-ring.
- Ensure thread sealant (Loctite 680 - Packet) was applied completely all around the drywell head.
- Ensure the drywell is tightened fully into the coupling.
- Turn the domestic cold water supply valve back on (Refer to Manual for refilling) when new drywell
installation is complete.
1. Ensure the threaded area of the coupling and drywell are clean of pipe dope and debris. Remove the old O-ring.
2. Apply a generous amount of thread sealant (supplied in kit) completely around all the drywell threads and
rethread the drywell into the tank.
3. Re-insert the thermostat-sensing bulb into the drywell. Ensure the sensing bulb is inserted fully to the bottom of
the drywell.
Make sure capillary tube is not kinked or damaged. A defective capillary tube can cause the
thermostat to fail, resulting in a situation that can result in severe personal injury or death.
NOTICE
635-600-061
635-600-062
635-600-063
635-600-064
635-600-065
GOLD Plus 30
GOLD Plus 40 / Ultra Plus 40
GOLD Plus 60 / Ultra Plus 60
GOLD Plus 80 / Ultra Plus 80
PLUS 100 and 120
19.68
27.56
37.40
47.25
51.25
DRYWELL KIT
PART NUMBER MODEL NUMBER DRYWELL LENGTH
WARNING
NOTICE
NOTICE
Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
IWH-A020-A/0409
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