Product Manual

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1. Disconnect power supply to fans and/or control when reversing fan direction or servicing the XCHANGER. Failure to do so may
result in personal injury and/or equipment damage.
2. Make certain the power source is adequate for the XCHANGER requirements. Do not add the XCHANGER to a circuit where the
total electrical load is unknown.
XCHANGER DEHUMIDISTAT CONTROL MODULE OPERATION
The XCHANGER control module includes an adjustable dehumidistat control which activates the fan(s) if the
relative humidity rises above the selected set-point. The dehumidistat can be turned fully clockwise to the ‘on’
position for constant fan(s) operation or it can be turned fully counter-clockwise to ‘off’ during seasons or times
when it is not desired for the XCHANGER fan(s) to run.
STANDARD PLUG-IN TIMER OPERATION
A standard adjustable timer can also be utilized for timed operation of the XCHANGER fan(s). Plug timer into
standard outlet and plug XCHANGER control module into wall timer. Turn dehumidistat control fully clockwise to
the ‘on’ position. Both outlets in XCHANGER control module will be controlled by the wall timer.
TJERNLUND OPTIONAL SCP SPEED CONTROL OPERATION
Tjernlund’s optional SCP speed control can be used to vary the speed of both XCHANGER fans. Plug SCP
speed control into standard outlet and plug XCHANGER control module into SCP speed control. Both outlets in
XCHANGER control module will be controlled by the SCP speed control.
RECOMMENDED PATTERNS OF OPERATION
The XCHANGER X2D model includes a dehumidistat control which can cycle the XCHANGER fan(s) automatically based on the rela-
tive humidity level of the house or it can be operated based on recommendations below.
A standard plug-in wall timer can be programmed based on the lifestyle or needs of the occupants. For example, a family with smok-
ers may want to cycle the XCHANGER more frequently than a family of non-smokers.
Another program may be to cycle the XCHANGER during peak usage of exhaust fans, such as bathroom, kitchen, laundry or utility.
Outdoor air should be brought in at these peak times to help balance out pressure inside the house.
The XCHANGER can be cycled on and off at regular intervals to periodically provide fresh air to the home, exhaust stale air or have
one fan bring air in and the other fan exhaust air for a balanced air exchange. It can also be ran like an economizer to bring outside
air in during evening time when it is cooler outside.
HYPOTHETICAL XCHANGER OPERATION BASED ON LIFESTYLE
The example below shows a possible way in which cycling times of the XCHANGER may be determined based on household
occupant lifestyles.
6:00 A.M. to 9:00 A.M. = Outside fresh air should be brought into the house continuously to compensate for morning routines.
Bathing, cooking, laundry and other activities such as smoking necessitate that outside fresh air to be brought in. Depressurization of
the house at these times is common with many exhaust fans running at one time.
9:00 A.M. to 4:00 P.M. = House is normally vacant with parents at work and children at school. Cycle XCHANGER on and off for 15
minute intervals to assure fresh air is supplied to the house.
4:00 P.M. to 8:00 P.M. = Outside fresh air should be brought into the house continuously to compensate for evening routines. Bathing,
cooking, laundry and other activities such as smoking necessitate the need for outside fresh air to be brought in. Depressurization of
the house at these times is common with many exhaust fans running at one time.
8:00 P.M. to 6:00 A.M. = All members of the household are usually present. Outside fresh air is needed to dilute occupant generated
carbon dioxide during sleeping. Cycle XCHANGER on and off for 15 minute intervals, with occasional 30 minute intervals to assure
fresh air is supplied to house.
XCHANGER OPERATION BASED ON AIR CHANGES PER HOUR
This method of operation can be used to supplement or provide for guaranteed air change rates. Table 1 shows the constant Cubic
Feet Per Minute (CFM) of air necessary to produce the desired Air Change Per Hour rate (ACH), assuming natural infiltration of out-
side air at a rate of .10 ACH. Square footage is determined by calculating the finished living space of the house. Garages and crawl
space should not be included. The constant CFM figures shown assume that the living space has standard 8 foot ceilings.