C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Vertical DOAS
R e v. : 0 1 / 3 1 / 1 3
20
C l i m a t e M a s t e r Wa t e r - S o u r c e H e a t P u m p s
Figure 1: Air Balance Ports for Models 4 - 15 Ton
Cabinets
Figure 2: Air Balance Ports for Models 20 - 30 Ton
Cabinets
Recommended Duct Designs -
You must use proper
duct design to ensure that the DOAS unit operates
effi ciently and without problems. Undersized or
restrictive ducts reduce the system air fl ow which can
cause premature compressor failure. Use the proceeding
diagrams as a guide when you design the duct system.
Blower Adjustment Procedure -
Change the blower
speed by adjusting the motor pulley. To adjust the
variable pitch pulley, fi rst loosen the set screw. To
slow down the blower, turn the outer pulley face
counterclockwise (to decrease its pitch diameter). To
speed up the blower, turn the outer pulley face clockwise
(to increase its pitch diameter).
WARNING!
WARNING! - Disconnect power before adjusting blower.
Failure to disconnect power could result in death or serious
injury.
After every adjustment be sure to:
• Tighten the set screw against the flat spot on the
pulley hub so you don’t damage any threads.
• Adjust the belt tension if needed.
• Check to assure that the blower motor current draw
does not exceed the rating printed on the rating plate.
If the blower motor current draw exceeds its rating but
your airfl ow is still too low, the static pressure losses in
the ductwork and grilles may be higher than the unit was
designed for. If this happens, consult the ClimateMaster
Service Department. Please be prepared with system
serial and model number.
