Notice – Thermo Pride Air Handler Modular MV User Manual

Page 10

SECTION VIII: AIRFLOW AND COMFORT

SETTING SELECTION

AIRFLOW SELECTION

The airflow and comfort setting selection jumpers must be set properly

at the time of installation for proper system operation. Place jumpers in

the proper locations based on the information shown in Table 15 and

Figure 5.

Inputs to air handler control board are passed to the motor which deter-

mines the target CFM to be delivered. The following inputs will produce

the CFM per the appropriate table and selected tap settings.

These variable speed air handlers are designed to deliver constant air-

flow (CFM) regardless of the external static pressure (ESP) in the duct-

work. Therefore, if too many supply registers are closed, a filter

becomes clogged, or there is a restriction in the ductwork, the motor will

automatically operate at a higher speed to compensate for the higher

ESP. This may result in a higher operating sound level.
To Set Cooling Airflow:
Refer to the outdoor unit technical guide for the recommended airflow

with the matching evaporator coil. Refer to Table 15 for the possible

high speed cooling and heat pump airflow selections.
Find the recommended system airflow in Table 15 for the installed air

handler model.
Select the COOL airflow you need from Table 15. Set the COOL and

ADJUST Jumpers on the control as indicated in Table 15.
To Set Heat Pump Airflow:
The heat pump airflow setting is the same as the cooling airflow setting.

No additional airflow setting is required. However, you must set the

MODE jumper to the HP position for proper system operation (See Fig-

ure 5).
To Set Electric W1 Heat Airflow:
The blower speed required for 1st stage electric heat is different than

cooling. Refer to Table 15 for the possible CFM selections. Refer to

Table 9 for the minimum required airflow for the electric heater installed.

Find the desired airflow in Table 15 for low heat. Set the HEAT jumper

on the control as indicated in Table 15.

To Set W2 Electric Heat Airflow:
Airflow for any W2 input, which is for Stages 2 & 3 of electric heat, is the

indicated CFM for high heat tap selection on Table 15.

Fan Only CFM:
When the connection is made from "R" to "G", the fan only mode is acti-

vated. In this mode, the airflow will depend on the position of the CONT

Fan jumper. In the “H” position, the blower will deliver 85-90% of full

capacity. In the “M” position, the blower will deliver 60-65% of full

capacity. In the “L” position, the blower will deliver 30-35% of full capac-

ity.
Blower Ramp-Up /Ramp-Down:
To minimize the sound made by the blower when it speeds up or slows

down, the blower will slowly ramp up or down from one speed to

another. Changes in blower speed during A/C or heat pump heating can

take up to 30 seconds. Changes in blower speed during electric strip

heating can take up to 15 seconds.

COMFORT SETTINGS

Normal

The normal setting provides a ramp-up from zero airflow to full capacity

and a ramp-down from full capacity back to zero airflow.

Humid

The humid setting is best-suited for installations where the humidity is

frequently very high during cooling season, such as in the southern part

of the country. On a call for cooling, t
he blower will ramp up to 50% of full capacity and will stay there for two

minutes, then will ramp up to 82% of full capacity and will stay there for

five minutes, and then will ramp up to full capacity, where it will stay until

the wall thermostat is satisfied.

FIGURE 10: Line Power Connections

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

SINGLE SOURCE (2.5 - 10 KW)

GND. LUG

POWER
SUPPLY

GND.
LUG

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

3 PHASE (10 - 15 KW)

GND. LUG

POWER
SUPPLY

GND.
LUG

1 PHASE ELECTRIC HEAT

WITH CIRCUIT BREAKER

AS SHIPPED FROM FACTORY

SINGLE SOURCE

(2.5 - 25 KW) - 25 KW SHOWN

GND. LUG

POWER
SUPPLY

GND.
LUG

1 PHASE ELECTRIC HEAT

WITH CIRCUIT BREAKER

& BREAKER BAR REMOVED

MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN

GND. LUG

POWER
SUPPLY 1

GND.
LUG

POWER
SUPPLY 2

POWER
SUPPLY 3

TYPICAL WIRING WITHOUT ELECTRIC HEAT

GND. LUG

POWER
SUPPLY

GND.
LUG

POWER WIRING (208/230-1-60)

NOTE: USE ONLY COPPER CONDUCTORS

TERMINAL
BLOCK

MAY BE 1, 2, OR 3
CIRCUIT BREAKERS

(JUMPER BAR)

CONNECT TRANSFORMER LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)

Incorrect airflow and comfort settings may result in decreased sys-
tem efficiency and performance.

NOTICE

DO NOT change the ADJUST tap position on the control as this will
change your cooling airflow previously selected.

TABLE 5: Comfort Setting Selection

DELAY TAP

COMFORT SETTING

Normal

Humid

Dry

Temperate