39
ON. To manually exercise this valve without an active Circuit
B compressor, see the section titled
Service Test
HMZR
RHV
. To view the actual valve position at any time,
use the Outputs menu (
Outputs
COOL
RHV)
.
•
Service Test
COOL
C.EXV
(HMV-1: Condenser EXV
Position). On Humidi-MiZer equipped units, this item al-
lows the user to exercise the valve that controls refrigerant
flow to the Circuit B condenser. To exercise the valve,
RHV must first be switched to ON
(Service Test
COOL
RHV)
and a Circuit B compressor must be com-
manded ON. The valve default position is 100% (com-
pletely open). The user will be able to adjust the valve
from 0 to 100% through this function. The only constraint
on the valve position is that the percentage sum of the by-
pass valve
(Service Test
COOL
B.EXV)
and condens-
er valve must equal 100%. For example, if the condenser
modulating valve is only 80% open, then the gas bypass
modulating valve must remain at least 20% open. The ef-
fect of closing the condenser valve will be to increase the
supply air temperature (additional reheat capacity). To
view the actual valve position at any time, the user can use
the Outputs menu (
Outputs
COOL
C.EXV).
•
Service Test
COOL
B.EXV
(HMV-2: Bypass EXV Po-
sition). On Humidi-MiZer equipped units, this item allows
the user to exercise the valve that controls discharge gas
bypass around the Circuit B condenser. To exercise the
valve, RHV must first be switched to ON
(Service Test
COOL
RHV)
and a Circuit B compressor must be com-
manded ON. The valve default position is 0% (completely
closed). The user will be able to adjust the valve from 0 to
100% through this function. The only constraint on the
valve position is that the percentage sum of the bypass
valve and condenser valve (
Service Test
COOL
C.EXV)
must equal 100%. For example, if the condenser
modulating valve is only 80% open, then the gas bypass
modulating valve must remain at least 20% open. The ef-
fect of opening the bypass valve will be to increase the
supply air temperature (additional reheat capacity).
To
view the actual valve position at any time, the user can use
the Outputs menu (
Outputs
COOL
B.EXV).
Heating
The Heat Test Mode sub-menu will offer automatic fan start-up if
the unit does not have gas fired heat. On gas heat units, IGC feed-
back from the gas control units will bring the fan on as required.
Within this sub-menu, control of the following is possible:
•
Service Test
HEAT
HT.ST
(Requested Heat Stage).
When this item is non-zero, the currently configured heat
type will energize the corresponding heat relay pattern that
reflects the requested stage. In addition the upper limit will
be clamped to reflect the maximum configured number of
stages. When non-zero, the heat relays will be “read-only”
and reflect the currently selected pattern.
•
Service Test
HEAT
HT.1-6
,
Service Test
HEAT
H.I.R
(Manual Heat Relay Control). If the “Heat Stage Re-
quest” item is set to zero, it will be possible to individually
control the heat relays, including the heat interlock relay.
•
Service Test
HEAT
H1.CP
(Modulating Heat Capaci-
ty). If configured for modulating gas or SCR electric heat,
the user will be able to manually control the capacity of the
modulating heat section (0 to 100%). The requested heat
stage must be greater than or equal to 1 or heat relay 1
must be on before the control will accept a modulating
heat capacity request. If neither case is true, the control
will overwrite the modulating heat request back to 0%.
•
Service Test
HEAT
HTC.C
(
Ht Coil Command Posi-
tion). If configured for hydronic heat type, the user will be
able to manually control the positioning of the actuator
which controls hot water (0 to 100%).
THIRD PARTY CONTROL
Thermostat
The method of control would be through the thermostat inputs:
Y1 = first stage cooling
Y1 and Y2 = first and second stage cooling
W1 = first stage heating
W1 and W2 = first and second stage heating
G = supply fan
Alarm Output
The alarm output is 24-v at TB201-12 and TB201-11. The con-
tact will provide relay closure whenever the unit is under an
alert or alarm condition (5 va maximum).
Remote Switch
The remote switch may be configured for three different func-
tions. Under
Configuration
UNIT,
set
RM.CF
to one of the
following:
0 = no remote switch
1 = occupied/unoccupied switch
2 = start/stop switch
3 = occupancy override switch
Under
Configuration
SW.LG
RMI.L
,
the remote occupancy
switch can be set to either a normally open or normally closed
switch input. Normal is defined as either unoccupied, start, or “not
currently overridden,” respective to the
RM.CF
configuration.
With
RM.CF
set to 1, no time schedules are followed and the
unit follows the remote switch only in determining the state of
occupancy.
With
RM.CF
set to 2, the remote switch can be used to shut
down and disable the unit, while still honoring timeguards on
compressors. Time schedules, internal or external, may be run
simultaneously with this configuration.
With
RM.CF
set to 3, the remote input may override an unoccu-
pied state and force the control to go occupied mode. As with the
start/stop configuration, an internal or external time schedule may
continue to control occupancy when the switch is not in effect.
VFD Control
On VFD equipped supply fans, supply duct static pressure con-
trol may be left under unit control or be externally controlled.
To control a VFD externally with a 4 to 20 mA signal, set
SP.RS
to 4, under the
Configuration
SP
menu. This will set
the reset to VFD control. When
SP.RS
= 4, the static pressure
reset function acts to provide direct VFD speed control where
4 mA = 0% speed and 20 mA = 100% (
SP.MN
and
SP.MX
will
override). Note that
SP.CF
must be set to 1 (VFD Control) pri-
or to configuring
SP.RS
= 4. Failure to do so could result in
damage to ductwork due to overpressurization.
In effect, this represents a speed control signal “pass through”
under normal operating circumstances. The
Comfort
Link con-
troller overrides the third party signal for critical operation sit-
uations, most notably smoke and fire control.
Wire the input to the controls expansion module (CEM) using
TB202-6 and TB202-7. An optional CEM board is required.
See Appendix D and the VFD literature supplied with the unit for
VFD configurations and field wiring connections to the VFD.
Supply Air Reset
With the installation of the CEM, the
Comfort
Link controls are
capable of accepting a 4 to 20 mA signal to reset the supply-air
temperature up to a maximum of 20°F.
Under
Configuration
EDT.R,
set
RS.CF
to 3 (external 4 to
20 mA supply air reset control). The 4 to 20 mA input to the
control system (TB202-9 and TB202-8), will be linearized and
range from 0ºF to 20°F. For example, 4 mA = 0ºF reset, 12 mA
= 10°F reset and 20 mA = 20ºF reset.
Содержание Weathermaster 48P2030-100
Страница 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Страница 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Страница 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Страница 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Страница 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Страница 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Страница 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Страница 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Страница 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Страница 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...
