10
On units that were shipped without factory installed pumps, two
black wires should be connected to the terminals marked “BOILER”
T T (see Fig 11C-2). In applications where a boiler provides the hot
water supply, these wires should be connected to the boiler control
wiring. Terminals “BOILER” T T are normally open dry contacts.
In applications where a valve is used to regulate the hot water supply,
the two black wires located on the “BOILER” T T terminals should be
removed and placed on the two terminals marked “VALVE”. These
wires should be connected to a 24V valve according to local require-
ments and instructions of the valve manufacturer.
On a call for heat, 24V will be sent to the field-installed valve or pump
relay, the valve will open or pump relay will close contacts allowing
the pump to run. Water will circulate through the water (hydronic) coil
for 60 seconds prior to energizing the blower. After the thermostat is
satisfied, the blower will continue to stay energized for a minimum of
30 seconds. The additional blower run time helps maximize heating
efficiency.
Fig 11D-3.
12. Condensate Drain
Air volume needs to be set to the level recommended by the outdoor
unit equipment manufacturer. Most systems will require around 400
CFM of indoor air for every 1 ton of system cooling capacity. The air
volume must be set prior to attempting system charge.
This air handler uses a constant torque ECM motor. This motor
will try to maintain proper motor torque to achieve programmed air
volume levels at varying levels of external static pressure. The air
volume level produced by the air handlers at varying external static
pressure levels is shown in Table 12-1.
Use a Magnehelic Gauge with a 1” scale and two static pressure
tips to measure the static pressure during the air volume adjustment
procedure (Fig. 13-1). The high port static pressure tip should be
placed in the supply duct near the outlet of the air handler. The low
port static pressure tip should be placed in the return air duct near
the entrance to the air handler. The factory provided air filter should
be in place inside of the air handler.
13. Air Volume Adjustment
Table 13-1.
Fig. 13-1
1.
Select a starting speed tap from the CFM table.
The blower motor has selectable speed taps labeled 1 thru 5 (Fig.
13-2). The speed taps are energized by 24 volts received from the
time delay relay. When two stage cooling units are used, both the
first and second stage fan speed taps will be energized at the same
time. The motor will run at the speed generated at the highest motor
speed tap.
2.
Call for fan only operation at the thermostat.
.
3.
Read the external static pressure level on the Magnehelic gauge.
4.
Make speed tap selection changes to get the air volume as close
as possible to the required level.
.
Fig. 13-2
11E. Freeze Protection Sensor Wiring
The freeze protection sensor is connected to the “FP” and “R“ ter-
minals. This sensor is normally open and will close when the sensor
detects a temperature of less than 40ºF. The pump will operate and
stay ON for a minimum of 30 seconds.
The board has a built-in timer which circulates hot water 6 times a
day for 60 seconds to prevent the hydronic coil from freezing.
1. Condensate drain is located at front as shown in picture with pri-
mary and secondary drain port.
2. Pipe condensate system using proper PVC fittings.
3. Ensure a minimum 2” trap
is installed in the condensate
drain. Locate the trap near to
the connection opening on
the air handler. See illustra-
tion.
SECONDARY
DRAINPORT
PRIMARY
DRAINPORT
REVISIONS
ERN
ZONE
REV.
DESCRIPTION
DATE
CHECKED BY
TBD
0
INITIAL RELEASE
10/23/2017
A
A
B
B
4
4
3
3
2
2
1
1
DO NOT SCALE DRAWING
Stack up Analysis
SHEET 1 OF 1
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
SCALE:
LBS
REV
PART. NUMBER
B
SIZE
TITLE:
NAME
DATE
ENG APPR.
DRAWN BY
MATERIAL
DECIMAL: ANGULAR:
XXX .015 2°
XX .03
PROPRIETARY AND CONFIDENTIAL
THE INFORMATION CONTAINED IN THIS
DRAWING IS THE SOLE PROPERTY OF
ASPEN MANUFACTURING CO.
ANY
REPRODUCTION IN PART OR AS A WHOLE
WITHOUT THE WRITTEN PERMISSION OF
ASPEN MANUFACTURING CO.
IS
PROHIBITED.
THIRD ANGLE PROJECTION
TOLERANCES:
WEIGHT:
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