GMVC9 GCVC9 Installation Instructions

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Example: If the *MVC960804CN** is set for 1210 CFM
on cooling, the “ADJUST” is set to “+” (plus).
The four heating speeds available are “A
Plus”, “B Plus”, “C Plus”, and “D Plus”. “A
Plus” has a rise of 46°F for both stages which
is within the 30-60°F rise range for the
*MVC960804CN**. This setting will keep
electrical consumption to a minimum. Set
the “Heat” speed DIP switches to “A”.
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AOFFOFF
B* ON OFF
COFFON
DONON
(Indicates factory setting)
Sw itch Bank S4
Heating
Airflow
DIP Sw itc h No.
8. Select the desired “heating” speed tap by positioning
switches S4- 3,4 appropriately. Refer to figure above.
Verify CFM by noting the number displayed on the dual 7-
segment LED display.
In general lower heating speeds will: reduce electrical consump-
tion, lower operating sound levels of the blower, and increase the
outlet air temperature delivered to the home. The speeds avail-
able allow the blower performance to be optimized for the par-
ticular homeowner’s needs.
Continuous fan speeds that provide 25, 50, 75 and 100% of
the furnace’s maximum airflow capability are selectable via
dip switches S5- 3, 4.
Example: If the furnace’s maximum airflow capability
is 2000 CFM and 25% continuous fan speed
is selected, the continuous fan speed will
be 0.25 x 2000 CFM = 500 CFM.
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90 seconds OFF OFF
120 seconds ON OFF
150 seconds* OFF ON
180 seconds ON ON
Heat Off Delay Dip Switches
(*Indicates factory setting)
Heat OFF Delay
DIP Sw itch No.
Sw itch Bank: S1
BLOWER HEAT OFF DELAY TIMINGS
The integrated control module provides a selectable heat off
delay function. The heat off delay period may be set to 90, 120,
150, 180 seconds using the DIP switches or jumper provided on
the control module. The delay is factory shipped at 150 seconds
but may be changed to suit the installation requirements and/or
homeowner preference. Refer to the following figures for switch
positions and corresponding delay times.
C OMFORT N ET ™ S YSTEM
OVERVIEW
The ComfortNet system is a system that includes a ComfortNet
compatible furnace and air conditioner or heat pump with a CTK0*
thermostat. A valid ComfortNet system could also be a compat-
ible furnace, CTK0* thermostat and non-compatible, single stage
air conditioner. Any other system configurations are considered
invalid ComfortNet systems and must be connected as a tradi-
tional (or non-communicating) system (see Electrical Connec-
tions for wiring connections).
A ComfortNet heating/air conditioning system differs from a
non-communicating/traditional system in the manner in which
the indoor unit, outdoor unit and thermostat interact with one
another. In a traditional system, the thermostat sends com-
mands to the indoor and outdoor units via analog 24 VAC signals.
It is a one-way communication path in that the indoor and out-
door units typically do not return information to the thermostat.
In a ComfortNet system, the indoor unit, outdoor unit, and
thermostat comprising a ComfortNet system “communicate” digi-
tally with one another, creating a two-way communications path.
The thermostat still sends commands to the indoor and outdoor
units. However, the thermostat may also request and receive
information from both the indoor and outdoor units. This infor-
mation may be displayed on the ComfortNet thermostat. The
indoor and outdoor units also interact with one another. The
outdoor unit may send commands to or request information from
the indoor unit. This two-way digital communications between
the thermostat and subsystems (indoor/outdoor unit) and be-
tween subsystems is the key to unlocking the benefits and fea-
tures of the ComfortNet system.
Two-way digital communications is accomplished using only two
wires. The thermostat and subsystem controls are power with
24 VAC. Thus, a maximum of 4 wires between the equipment
and thermostat is all that is required to operate the system.
PCBKF105 IFC has the added feature of 24 VAC input to G
terminal when using a communicating thermostat (CTK0*).
ERV/HRV and other accessories can send a 24 VAC signal to
the G terminal and energize the continuous fan. The con-
tinuous fan speed can be adjusted on switch bank S5, DIP
switch 3 & 4.