Quantech QTC40160, Installation Operation & Maintenance, Page: 173 / 188

Section 9 - Maintenance
Quantech
173
Form QTC4-NM2
Issue date: 05/12/2023
9
Steps to touch-up end, dead tubes or
condenser coil headers
In cases where e-coating on the end tubes and/or con-
denser coil headers is showing signs of degradation,
2-part Urethane Mastic must be used for touch-up. Do
not use 2-part Urethane Mastic on finned coil surface.
Do not use 2-part Urethane Mastic on
finned coil surface. Using Urethane
Mastic on finned surfaces can result in
the blockage of fin sections which leads
to reduced airflow across the coil.
Materials required:
• 2-Part Urethane Mastic kit, part number:
013-04188-000.
• 1 x Mixing Dish.
• 3 x 3 ml droppers.
• Soft bristle paint brush.
The procedure listed below must be followed to touch-
up end tubes and condenser coil headers:
1. 2-Part Urethane Mastic kit consists of Component
A-Urethane Mastic (black component) and Com-
ponent B-Urethane Mastic Activator (clear com-
ponent).
2. Thoroughly stir the can containing component A
(Urethane Mastic). It is important to stir the Ure-
thane Mastic thoroughly to ensure any settled pig-
ment is dispersed before application.
3. Gently shake the can containing component B
(Activator).
4. Mix urethane mastic and an activator in a 5:1
ratio. Using one dropper, add 5 mm of component
A to the mixing dish.
5. Using the second, clean dropper, add 1 ml of com-
ponent B to the mixing dish.
6. Mix the components well and allow the solution
in the dish to set for 30 min. Power mixing is pre-
ferred. If needed, make more amount of solution
for application.
7. Using the paint brush, apply the touch up paint to
the end tubes or coil headers as needed.
Table 34 - Part numbers
Part number (P/N) Description
013-04185-000 Cleaner, coil, 4-1 gal
013-04185-001 Cleaner, coil, 1 gal
013-04186-000 Reducer, salt, 4-1 gal
013-04186-001 Reducer, salt, 1 gal
013-04187-000 Paint, touch-up, 12 oz
013-04188-000 Mastic, 2-part Urethane
Chilled liquid system maintenance
Whenever the chilled liquid system requires mainte-
nance, adhere to and observe all the following precau-
tions.
Scheduled maintenance
The QTC4 chiller is equipped with Service Reminder
Warnings that show service reminders on the chiller
panel every 3 months, 12 months, 36 months, and 60
months from the date of last service. Ensure a quali-
fied service engineer conducts the maintenance opera-
tions on a regular basis, which is detailed in Mainte-
nance requirements for QTC4 chillers on page 175 .
It must be noted that the interval necessary between
each minor and major service can vary depending on,
for instance, application, site conditions and expected
operating schedule. Normally a minor service must
be carried out every three to six months and a major
service once a year. It is recommended that your local
Johnson Controls Service Center is contacted for ser-
vice recommendations for individual sites.
Thermal dispersion flow switch
Check the sensor tip for buildup regularly, because it
can affect the sensitivity of the sensor.
In case of any buildup at the sensor tip, use a soft cloth
to remove it. Use vinegar as the cleaning agent to re-
move any stubborn buildup if necessary.
Chiller/compressor operating log
A chiller or compressor operating log is supplied at the
end of this section for logging compressor and chiller op-
erating data.