W415-1013 / C / 11.19.13
22
EN
“B” HARNESS
CONNECTOR
CONTROL WIRE FOR
BLOWER CONTROL
ON ORIGINAL
FURNACE FIELD
INSTALLATION
RELAY BLOCK
SUPPLIED IN
“ADD ON ”
MODULE KIT
LINES 12 & N TO
ENGAGE COIL
ON RELAY
RG
LOWER ELECTRICAL BOX - MAIN HARNESS HMF150/200
NOTE
•
Adjust the motor speed when operating the original furnace, so that temperature and pressure
differential measured between warm air supply plenum remain the same before and after addition of
the “Add On”.
•
Adjustment of motor speed when operating “Add On” should provide an air
fl
ow of 1100-1300 CFM
thru the ducting system (HMF150), 1300-1700 CFM (HMF200).
NOTE
a) For ECM motor in original furnace
• relay acts as dry contact for G contact on G13 control board.
b) For PSC motor in original furnace (TYPE 8A05A-101)
• spec White Rogers fan control centre supplied by installer
• control wire can be from R&G contacts of fan centre to dry contact on relay in lower control box
HMF150
c) PRECAUTION - The new fan centre must have same power source as original furnace.
d) Motor speed may need to be increased to overcome increased static pressure:
• PSC - move to higher speed as needed
• ECM - adjust taps or control as needed
