SPEED TAP SELECTION FOR VARIABLE SPEED
AIR HANDLERS
The variable speed air handler motor’s speed tappings must
be adjusted from the factory settings for the required outdoor
condensing unit as shown in Table 2. A typical variable speed
air handler (N1VS/N2VS) connector board configuration show-
ing the various speed taps is shown in Figure 10. Refer to
variable speed air handler installation instructions for additional
details, regarding the CFM for the corresponding speed taps.
By selecting the speed taps shown in Table 2, the air handler
will deliver the rated CFM when both (lead and follower)
compressors are running, and the air handler motor will oper-
ate at a lower speed automatically when only the lead com-
pressor is running. The variable speed motor used in this air
handler is programmed to automatically adjust to the lower
speed when there is a call for first stage (Y1) cooling from the
two stage cooling thermostat.
INDOOR
VARIABLE
SPEED
AIR
HANDLER
INDOOR
EVAP.
COIL
CONDENSING UNITS
H*DS036
H*DS048
H*DS060
COOL
TAP
ADJ
TAP
DELAY
PROFILE
COOL
TAP
ADJ
TAP
DELAY
PROFILE
COOL
TAP
ADJ
TAP
DELAY
PROFILE
N1VSD14
G/HC036
Jumper
at "B"
NO
Jumper
Jumper
at "C"
NA
NA
NA
NA
NA
NA
G/HC042
N2VSD20
G/HC048
Jumper
at "A"
NO
Jumper
Jumper
at "C"
Jumper
at "B"
NO
Jumper
Jumper
at "C"
NA
NA
NA
G/HC060
Jumper
at "A"
Jumper
at "C"
Jumper
at "C"
Jumper
at "C"
NO
Jumper
Jumper
at "C"
Jumper
at "B"
Jumper
at "C"
Jumper
at "C"
NOTE: For ARI testing requirements, adjust the delay profile in "Test Mode". Refer to Installation Instructions for N1VS variable speed
air handlers for additional details if necessary.
NA = Not Applicable.
TABLE 2 - RECOMMENDED SPEED TAP SELECTION
FIGURE 10 - N1VS/N2VS Connector Board
SCREW
TERMINAL
BOARD
DE-HUMIDIFI
CATION
CONTROL
ACCESSORY
JUMPER
DELAY
PROFILE TAP
BLOWER MOTOR
INTERFACE HARNESS
CONNECTS HERE
COOL TAP
ELECTRIC
HEAT TAP
ADJ TAP
ELECTRIC HEAT OR TRANSFORMER WIRING
HARNESS CONNECTS HERE
JUMPER IN STORED POSITION
(Vertically on RH side, pins "A" and "B")
HEAT PUMP JUMPER
JUMPER IN "A" CFM
(Horizontally jumper two "A" pins)
550.37-N1Y
8
Central Environmental Systems
