Operating Parameters; On-Board Battery Backup; Thermal Dispersion Flow Switch; Brazed Plate Heat Exchanger (Evaporator) Heater - York YLAA0041 Installation Operation & Maintenance

Section 10: Maintenance
Do not use 2-part Urethane Mastic on
finned coil surface. Using Urethane
Mastic on finned surfaces can result in
blockage of fin sections which will lead
to reduction in air flow across the coil.
Necessary materials:
• 2-Part urethane mastic kit, part number:
013-04188-000).
• 1 x mixing dish.
• 3 x 3 ml droppers.
• Soft bristle paint brush.
The 2-part urethane mastic kit consists of component
A-urethane mastic (black component) and component
B-urethane mastic activator (clear component)
To touch-up the end tubes and condenser coil headers,
complete the following steps:
1. 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.
2. Gently shake the can containing component B,
the activator.
3. Mix the urethane mastic and activator in a 5:1 ra-
tio. Using one dropper, add 5 mm of component A
to the mixing dish.
4. Using the second (clean) dropper, add 1 ml of
component B to the mixing dish.
5. 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.
6. Using the paint brush, apply the touch up paint to
the end tubes or coil headers as needed.

Table 36: Cleaning materials

Part number (p/n)
013-04185-000
013-04185-001
013-04186-000
013-04186-001
013-04187-000
013-04188-000
202
Description
Cleaner, coil, 4 gal- 1 gal
Cleaner, coil, 1 gal
Reducer, salt 4 gal - 1 gal
Reducer, salt 1 gal
Paint, touch-up 12 oz
Mastic, 2-part urethane

Operating parameters

Perform regular checks on the system to ensure that
operating temperatures and pressures are within limi-
tations, and that the operating controls are set within
proper limits. See Section 8: Unit operation, Section 6:
Commissioning, and Section 4: Installation.

On-board battery backup

The Real Time Clock chip (U5) located on the 031-
02630 IPU II board that maintains the date/time and
stores customer programmed setpoints.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.

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.
Brazed plate heat exchanger
(evaporator) heater
The internal power supply to the Evapo-
rator Heater is 120 VAC. Disconnecting
120 VAC power from the unit, at or below
freezing temperatures, can result in dam-
age to the evaporator and unit as a result
of the chilled liquid freezing.

Overall unit inspection

In addition to the checks listed on this page, perform
periodic overall inspections on the unit to ensure prop-
er equipment operation. Investigate and correct imme-
diately items such as loose hardware, component op-
eration, refrigerant leaks, and unusual noises.
Form 150.72-ICOM6
Issue date: 12/19/2023
Johnson Controls