25
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
CAUTION
Hot discharge water
Discharge water can be as hot as
212 °F (100 °C) and can damage the
drain plumbing.
Most RTS units are shipped with
integrated drain water tempering
turned on. Validate the status of drain
water tempering by using the Vapor-
logic display. See the Vapor-logic
touchscreen IOM for instructions.
Piping:
INSTALLATION
Drain water tempering
AUTOMATIC DRAIN WATER TEMPERING
Governing codes may require that the 212 °F (100 °C) drain and skim/
overflow water from the humidifier be tempered before it is discharged into the
building drain piping. The RTS humidifier RX series is shipped with drain water
tempering enabled. This feature can be disabled in the Vapor-logic controller.
When drain water tempering is enabled, the following steps will take place to
ensure drain water is less than 140°F (60 °C):
1. Water greater than 140°F (60 °C) is detected in the drain assembly with a
temperature sensor.
2. Fill valves open, directing cool water to the drain port within the tank.
3. Hot and cold water mix in the tank near the drain port.
4. Drain port valve opens and sends tempered water to the drain manifold.
5. The Vapor-logic controller controls the drain and fill valves using input
from the drain temperature sensor to enable closed-loop control of drain
water temperature, thus ensuring it does not exceed 140°F (60°C) while
minimizing water usage.
MECHANICAL TEMPERING DEVICE
There are instances where an alternate mechanical tempering device (see
Figure 28-1) may be needed. Outdoor units have the tempering device
installed inside the enclosure. For all other units the device ships separate and
must be installed in the field.
• All outdoor enclosure units ship with the thermostatic tempering installed.
This is to allow for drain water tempering during a power outage. Outdoor
humidifiers ship with normally open drain valves. If drain water tempering
is required, the mechanical tempering device is required when using mini-
drain operating mode.
• The RTS humidifier is not set up to allow for tempering to be done with
an alternate water source that feeds to the humidifier. If such an install is
desired, the mechanical tempering device can be used. Ensure that the
automatic drain water tempering is turned off on the Vapor-logic controller.
