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FIELD SELECTABLE INPUTS
Jumpers and DIP (dual in-line package) switches on the
control board are used to customize unit operation and can be
configured in the field.
C Control Jumper Settings (See Fig. 19)
WATER COIL FREEZE PROTECTION (FP1) LIMIT
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to
choose FP1 limit of 10 F or 30 F. To select 30 F as the limit,
DO NOT clip the jumper. To select 10 F as the limit, clip the
jumper.
AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-
TING — Select jumper 2 (JW2-FP2 Low Temp) to choose
FP2 limit of 10 F or 30 F. To select 30 F as the limit, DO NOT
clip the jumper. To select 10 F as the limit, clip the jumper.
ALARM RELAY SETTING — Select jumper 1 (JW1-AL2
Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)
or to remain as a dry contact (no connection). To connect AL2
to R, do not clip the jumper. To set as dry contact, clip the
jumper.
C Control DIP Switches — The C Control has 1 DIP
switch block with two switches. See Fig. 19.
PERFORMANCE MONITOR (PM) — DIP switch 1 will
enable or disable this feature. To enable the PM, set the switch
to ON. To disable the PM, set the switch to OFF.
STAGE 2 — DIP switch 2 will enable or disable compressor
delay. Set DIP switch to OFF for stage 2 in which the compres-
sor will have a 3-second delay before energizing.
NOTE: The alarm relay will not cycle during Test mode if
switch is set to OFF, stage 2.
D Control Jumper Settings (See Fig. 20)
WATER COIL FREEZE PROTECTION (FP1) LIMIT
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to
choose FP1 limit of 10 F or 30 F. To select 30 F as the limit,
DO NOT clip the jumper. To select 10 F as the limit, clip the
jumper.
AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-
TING — Select jumper 2 (JW2-FP2 Low Temp) to choose
FP2 limit of 10 F or 30 F. To select 30 F as the limit, DO NOT
clip the jumper. To select 10 F as the limit, clip the jumper.
ALARM RELAY SETTING — Select jumper 4 (JW4-AL2
Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)
or to remain as a dry contact (no connection). To connect AL2
to R, do not clip the jumper. To set as dry contact, clip the
jumper.
LOW PRESSURE SETTING — The D Control can be con-
figured for Low Pressure Setting (LP). Select jumper 1 (JW1-
LP Norm Open) for choosing between low pressure input nor-
mally open or closed. To configure for normally closed opera-
tion, do not clip the jumper. To configure for normally open op-
eration, clip the jumper.
D Control DIP Switches — The D Control has 2 DIP
switch blocks. Each DIP switch block has 8 switches and is
labeled either S1 or S2 on the circuit board. See Fig. 20.
DIP SWITCH BLOCK 1 (S1) — This set of switches offers
the following options for D Control configuration:
Performance Monitor (PM)
— Set switch 1 to enable or dis-
able performance monitor. To enable the PM, set the switch to
ON. To disable the PM, set the switch to OFF.
Compressor Relay Staging Operation
— Switch 2 will en-
able or disable compressor relay staging operation. The com-
pressor relay can be set to turn on with stage 1 or stage 2 call
from the thermostat. This setting is used with dual stage units
(units with 2 compressors and 2 D controls) or in master/slave
applications. In master/slave applications, each compressor and
fan will stage according to its switch 2 setting. If switch is set to
stage 2, the compressor will have a 3-second delay before ener-
gizing during stage 2 demand.
NOTE: If DIP switch is set for stage 2, the alarm relay will not
cycle during Test mode.
Heating/Cooling Thermostat Type
— Switch 3 provides selec-
tion of thermostat type. Heat pump or heat/cool thermostats
can be selected. Select OFF for heat/cool thermostats. When in
heat/cool mode, Y1 is used for cooling stage 1, Y2 is used for
cooling stage 2, W1 is used for heating stage 1 and O/W2 is
used for heating stage 2. Select ON for heat pump applications.
In heat pump mode, Y1 used is for compressor stage 1, Y2 is
used for compressor stage 2, W1 is used for heating stage 3 or
emergency heat, and O/W2 is used for RV (heating or cooling)
depending upon switch 4 setting.
O/B Thermostat Type
— Switch 4 provides selection for heat
pump O/B thermostats. O is cooling output. B is heating out-
put. Select ON for heat pumps with O output. Select OFF for
heat pumps with B output.
Dehumidification Fan Mode
— Switch 5 provides selection
of normal or dehumidification fan mode. Select OFF for dehu-
midification mode. The fan speed relay will remain OFF dur-
ing cooling stage 2. Select ON for normal mode. The fan speed
relay will turn on during cooling stage 2 in normal mode.
Switch 6
— Not used.
Boilerless Operation
— Switch 7 provides selection of boiler-
less operation and works in conjunction with switch 8. In
IMPORTANT: Jumpers and DIP switches should only
be clipped when power to control board has been turned
off.
Table 13 — 50RHS, RVS Blower Performance with HWR
LEGEND
COIL FACE
VELOCITY (FPM)
50RHS, RVS WITH REHEAT ESP LOSS
50RHS, RVS
015, 018 (in. wg)
50RHS, RVS
024, 030 (in. wg)
50RHS, RVS
036 (in. wg)
50RHS, RVS
042, 048 (in. wg)
50RHS, RVS
060 (in. wg)
50RHS, RVS
070 (in. wg)
200 0.040 0.037 0.033 0.031 0.028 0.026
250 0.059 0.052 0.046 0.042 0.038 0.034
300 0.088 0.077 0.066 0.059 0.051 0.044
350 0.131 0.113 0.096 0.085 0.073 0.061
400 0.203 0.181 0.160 0.145 0.131 0.117
450 0.258 0.242 0.226 0.215 0.205 0.194
500 0.375 0.360 0.345 0.335 0.326 0.316
ESP — External Static Pressure
HWR — Hot Water Reheat