T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
Vertical DOAS
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c l i m a t e m a s t e r . c o m
Table 3: Operating Limits Table
VF/VD Models
Air Limits
Cooling/Dehumid Mode
Heating Mode
Minimum Ambient Air
40ºF [4.4ºC]
40ºF [4.4ºC]
Maximum Ambient Air
100ºF [37.8ºC]
100ºF [37.8ºC]
Minimum Entering Air
50ºF [10.0ºC]
15ºF [-9.4ºC]
Maximum Entering Air
110ºF [43ºC]
80ºF [26.7ºC]
Water Limits
Minimum Entering Water
35ºF [1.7ºC]
35ºF [1.7ºC]
Maximum Entering Water
105ºF [1.7ºC]
90ºF [32.2ºC]
Unit Starting & Operating Conditions
Prior to Start-up -
A complete startup will minimize
operational problems and expensive callbacks. Read this
section thoroughly before attempting to commission the
ClimateMaster DOAS unit. Always disconnect the power
before servicing the equipment!
Note: For information regarding the factory-
supervised start-up with your system, refer to the
Service Bulletin towards the later part of this manual.
1. LEAK TEST ALL FIELD AND FACTORY PIPING.
Shipping and handling may have caused refrigerant
leaks inside the DOAS unit.
2. Check the rating plate for power requirements. The
available power supply voltage must be within ±5% of
the voltage printed on the rating plate.
3. Verify that all fi eld wiring matches the ClimateMaster
wiring schematics. Inspect and tighten all fi eld and
factory wiring.
4. Check and adjust the belt tension for a ½ -inch
defl ection at the mid-point of the blower belt(s) when
approximately 5 pounds of pressure is applied.
5. Check the drain pan and the condensate piping. Test
the drain and prime the p-trap by pouring water into
the drain pan.
6. Verify that all service valves in the refrigeration lines
are fully open.
7. Inspect the air fi lters and coils to assure they are clean.
If necessary, clean the coils and install new air fi lters.
8. Purge any air, dirt, and debris from water lines (if used)
to avoid clogging the internal passages of optional
heating coils or water side heat exchangers.
9. Make sure that the unit is level and securely mounted so
that it cannot shift or transmit vibration to the building.
Start-up Procedure -
First, read and understand the
“Start-Up Report” which was shipped with the DOAS
unit. ClimateMaster uses the start-up report to verify
the integrity of each installation. A thorough start-up
can reduce callbacks and can help increase customer
satisfaction. Carefully follow the process detailed in the
start-up report. Mail or fax the completed start-up report
back to ClimateMaster to validate your unit’s warranty.
Be sure to keep a copy for future reference. If you do not
have a start-up report, call the ClimateMaster Service
Department at (405) 745-6000 for a new copy. Please
be prepared with the model and serial number of the
DOAS unit. THE START-UP REPORT IS REQUIRED FOR
WARRANTY VALIDATION.
Note: The manufacturer strongly recommends all
piping connections, both internal and external to the
unit, be pressure tested by an appropriate method
prior to any fi nishing of the interior space or before
access to all connections is limited. Test pressure may
not exceed the maximum allowable pressure for the
unit and all components within the water system.
The manufacturer will not be responsible or liable
for damages from water leaks due to inadequate or
lack of a pressurized leak test, or damages caused
by exceeding the maximum pressure rating during
installation.
